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0001 # translation of docs_digikam_org_asset_management___data_protection.po to Slovak
0002 # Roman Paholík <wizzardsk@gmail.com>, 2023.
0003 msgid ""
0004 msgstr ""
0005 "Project-Id-Version: docs_digikam_org_asset_management___data_protection\n"
0006 "Report-Msgid-Bugs-To: \n"
0007 "POT-Creation-Date: 2023-12-30 00:35+0000\n"
0008 "PO-Revision-Date: 2023-03-19 10:10+0100\n"
0009 "Last-Translator: Roman Paholik <wizzardsk@gmail.com>\n"
0010 "Language-Team: Slovak <kde-sk@linux.sk>\n"
0011 "Language: sk\n"
0012 "MIME-Version: 1.0\n"
0013 "Content-Type: text/plain; charset=UTF-8\n"
0014 "Content-Transfer-Encoding: 8bit\n"
0015 "X-Generator: Lokalize 22.12.3\n"
0016 "Plural-Forms: nplurals=3; plural=(n==1) ? 0 : (n>=2 && n<=4) ? 1 : 2;\n"
0017 
0018 #: ../../asset_management/data_protection.rst:1
0019 msgid "Protect Your Images from Data Corruption and Loss"
0020 msgstr ""
0021 
0022 #: ../../asset_management/data_protection.rst:1
0023 msgid ""
0024 "digiKam, documentation, user manual, photo management, open source, free, "
0025 "learn, easy, disk errors, disk failures, power surges, ECC, transmission "
0026 "errors, storage media deterioration, recovery, redundancy, disaster "
0027 "prevention, lifetime, temperature, data size, common myths, metadata, IPTC "
0028 "stored in image files, XMP files associated, keep the originals, storage, "
0029 "scalability, media, retrieval of images and metadata, copying image data "
0030 "over to the next generation of media, applications, operating systems, "
0031 "virtualization, viewing device, use of the www, ZFS, BTRFS"
0032 msgstr ""
0033 
0034 #: ../../asset_management/data_protection.rst:14
0035 msgid "Data Corruption and Loss"
0036 msgstr ""
0037 
0038 #: ../../asset_management/data_protection.rst:16
0039 msgid "Contents"
0040 msgstr "Obsah"
0041 
0042 #: ../../asset_management/data_protection.rst:19
0043 msgid "Main Factors of Digital Data Loss"
0044 msgstr ""
0045 
0046 #: ../../asset_management/data_protection.rst:21
0047 msgid ""
0048 "Of course we're not talking about losing Blue-rays on the road or in a fire "
0049 "- that kind of loss is just the same as traditional paper copies or "
0050 "negatives. We are talking about problems with the so called *New Media*."
0051 msgstr ""
0052 
0053 #: ../../asset_management/data_protection.rst:23
0054 msgid ""
0055 "Problems with digital data can roughly be categorized into the following "
0056 "areas of concern:"
0057 msgstr ""
0058 
0059 #: ../../asset_management/data_protection.rst:25
0060 msgid ""
0061 "The physical deterioration of the media (all media deteriorate at different "
0062 "time scales)."
0063 msgstr ""
0064 
0065 #: ../../asset_management/data_protection.rst:27
0066 msgid "Undetected transmission errors during data transfer."
0067 msgstr ""
0068 
0069 #: ../../asset_management/data_protection.rst:29
0070 msgid ""
0071 "The lack of support for long-date, undoubtedly proprietary, digital formats."
0072 msgstr ""
0073 
0074 #: ../../asset_management/data_protection.rst:31
0075 msgid "Ancient hardware."
0076 msgstr ""
0077 
0078 #: ../../asset_management/data_protection.rst:33
0079 msgid ""
0080 "Kroll Ontrack, the worlds largest data recovery firm, have some interesting "
0081 "statistics on what actually causes data loss."
0082 msgstr ""
0083 
0084 #: ../../asset_management/data_protection.rst:36
0085 msgid "Cause of data loss"
0086 msgstr ""
0087 
0088 #: ../../asset_management/data_protection.rst:36
0089 msgid "Perception"
0090 msgstr ""
0091 
0092 #: ../../asset_management/data_protection.rst:36
0093 msgid "Reality"
0094 msgstr ""
0095 
0096 #: ../../asset_management/data_protection.rst:38
0097 msgid "Hardware or system problem"
0098 msgstr ""
0099 
0100 #: ../../asset_management/data_protection.rst:38
0101 msgid "78%"
0102 msgstr ""
0103 
0104 #: ../../asset_management/data_protection.rst:38
0105 msgid "56%"
0106 msgstr ""
0107 
0108 #: ../../asset_management/data_protection.rst:39
0109 msgid "Human error"
0110 msgstr ""
0111 
0112 #: ../../asset_management/data_protection.rst:39
0113 msgid "11%"
0114 msgstr ""
0115 
0116 #: ../../asset_management/data_protection.rst:39
0117 msgid "26%"
0118 msgstr ""
0119 
0120 #: ../../asset_management/data_protection.rst:40
0121 msgid "Software corruption or problem"
0122 msgstr ""
0123 
0124 #: ../../asset_management/data_protection.rst:40
0125 msgid "7%"
0126 msgstr ""
0127 
0128 #: ../../asset_management/data_protection.rst:40
0129 msgid "9%"
0130 msgstr ""
0131 
0132 #: ../../asset_management/data_protection.rst:41
0133 msgid "Computer viruses"
0134 msgstr ""
0135 
0136 #: ../../asset_management/data_protection.rst:41
0137 msgid "2%"
0138 msgstr ""
0139 
0140 #: ../../asset_management/data_protection.rst:41
0141 msgid "4%"
0142 msgstr ""
0143 
0144 #: ../../asset_management/data_protection.rst:42
0145 msgid "Disaster"
0146 msgstr ""
0147 
0148 #: ../../asset_management/data_protection.rst:42
0149 msgid "1-2%"
0150 msgstr ""
0151 
0152 #: ../../asset_management/data_protection.rst:45
0153 msgid "So let us analyze those cases step by step."
0154 msgstr ""
0155 
0156 #: ../../asset_management/data_protection.rst:50
0157 msgid "Storage Deterioration"
0158 msgstr ""
0159 
0160 #: ../../asset_management/data_protection.rst:52
0161 msgid ""
0162 "Devices listed below are sorted by data speed access feature, from the less "
0163 "faster to the most faster."
0164 msgstr ""
0165 
0166 #: ../../asset_management/data_protection.rst:55
0167 msgid "Magnetic Media"
0168 msgstr ""
0169 
0170 #: ../../asset_management/data_protection.rst:57
0171 msgid ""
0172 "Magnetic tapes are used in backup systems, much more in professional "
0173 "environments than in home use. Tapes have issues with data retention and "
0174 "changing technology, but they are safer in one aspect than optical drives: "
0175 "they are less exposed to scratches and dirt and writing deficiencies. On the "
0176 "other hand they are susceptible to magnetic fields. Throw a magnet next to a "
0177 "tape and it's gone. Tapes should be re-copied every 5-8 years, otherwise too "
0178 "many bits will fail and escape the checksum protection. The downside of "
0179 "magnetic tapes is often the recorder price and the restore time (20x longer "
0180 "than from HDD). Tape backup system have seen their best days."
0181 msgstr ""
0182 
0183 #: ../../asset_management/data_protection.rst:60
0184 msgid "Optical Drives"
0185 msgstr ""
0186 
0187 #: ../../asset_management/data_protection.rst:62
0188 msgid ""
0189 "Physical deterioration of the media happens more rapidly with paper and CD-"
0190 "Rs than the average of film. Yet while film lasts longer (sometimes decades "
0191 "longer) than other forms of media, the right kind of backup of digital media "
0192 "never loses anything. Film decays - digital 1's and 0's do not, and film "
0193 "starts to decay the moment it's created and developed. It will never have "
0194 "the same color, contrast, etc. that it did have a moment before. Digital "
0195 "doesn't do that. However, digital is susceptible to corruption. And yes, "
0196 "physical media such as floppies and magnetic hard drives are also "
0197 "susceptible to the decay of the medium, just like CDs are. They just last "
0198 "longer."
0199 msgstr ""
0200 
0201 #: ../../asset_management/data_protection.rst:64
0202 msgid ""
0203 "To combat the problem of optical drives, they need to be properly cared for "
0204 "and not trusted for more than a few years. Thankfully you can purchase "
0205 "archive-quality CDs and DVDs which last longer, though they are much more "
0206 "difficult to obtain and are much more expensive. There are offers out there "
0207 "for gold-plated optical drive, few euros a piece claiming 100 years storage "
0208 "life (if you care to believe it)."
0209 msgstr ""
0210 
0211 #: ../../asset_management/data_protection.rst:66
0212 msgid ""
0213 "Optical disks may become unreadable, but you can reduce the risk using good "
0214 "disks and a good recorder, and storing them in a correct way. The best "
0215 "optical drive recorders are not much more expensive than the cheapest, but "
0216 "they write in a much more reliable way. It's a matter of choosing the right "
0217 "one."
0218 msgstr ""
0219 
0220 #: ../../asset_management/data_protection.rst:68
0221 msgid ""
0222 "Essentially, optical drives are very prone to errors, even in a freshly "
0223 "written state. That's why they are heavily protected with a checksum "
0224 "mechanism (75% of data are effective data, the rest is formatting and "
0225 "checksum overhead). But even with that massive amount of protection they "
0226 "will suffer deterioration from chemical aging, ultra-violet exposure, "
0227 "scratches, dust, etc."
0228 msgstr ""
0229 
0230 #: ../../asset_management/data_protection.rst:70
0231 msgid ""
0232 "For damaged optical drives, Wikipedia `list all common applications <https://"
0233 "en.wikipedia.org/wiki/Data_recovery#List_of_data_recovery_software>`_ "
0234 "designed to get data from damaged floppies, hard drives, flash media such as "
0235 "camera memory and USB drives, and so forth."
0236 msgstr ""
0237 
0238 #: ../../asset_management/data_protection.rst:72
0239 msgid ""
0240 "Dual-layer optical media Blu-ray disk can store 50 GB, almost six times the "
0241 "capacity of a dual layer DVD at 8.5 GB. Everything that has been said about "
0242 "CDs/DVDs applies to Blu-ray disks as well."
0243 msgstr ""
0244 
0245 #: ../../asset_management/data_protection.rst:74
0246 msgid ""
0247 "Best practice: burn them slowly with a good recorder on archive quality "
0248 "media in an open, non-proprietary format, read the data back to verify, "
0249 "label them with some descriptive text + date & author, lock them away where "
0250 "it is clean, dark, animal safe and dry. And do not forget to copy them over "
0251 "to the next generation of media before you throw away your last piece of "
0252 "hardware or software able to read them."
0253 msgstr ""
0254 
0255 #: ../../asset_management/data_protection.rst:77
0256 msgid "Hard Disks"
0257 msgstr ""
0258 
0259 #: ../../asset_management/data_protection.rst:79
0260 msgid ""
0261 "Hard Disk (HDD) manufacturers keep their statistics to themselves. A "
0262 "manufacturer guaranty buys you a new disk, but no data. Google for One has "
0263 "done a large scale study on `HDD <https://en.wikipedia.org/wiki/"
0264 "Hard_disk_drive>`_ failure mechanisms: `Disk Failures study <https://"
0265 "research.google.com/archive/disk_failures.pdf>`_."
0266 msgstr ""
0267 
0268 #: ../../asset_management/data_protection.rst:81
0269 msgid ""
0270 "In a nutshell: Disks run longest when operating between 35°C and 45°C, at "
0271 "lower temperatures the error rates increases dramatically. Controller parts "
0272 "(electronics) are the foremost sources of failure, SMART does not diagnose "
0273 "any of this. Some `SMART <https://en.wikipedia.org/wiki/Self-Monitoring,"
0274 "_Analysis_and_Reporting_Technology>`_ errors are indicative of imminent "
0275 "failure, in particular scan errors and relocation counts. Lifetime "
0276 "expectancy is 4-5 years."
0277 msgstr ""
0278 
0279 #: ../../asset_management/data_protection.rst:83
0280 msgid ""
0281 "In general and contrary to intuition or ecological considerations, running a "
0282 "hard drive permanently results in a longer lifetime than switching it on and "
0283 "off all the time. It has even been reported that aggressive power management "
0284 "spinning down the drive can harm it quickly. Making it working hard shortens "
0285 "the lifetime somewhat. The worst factors for HDD probably are vibrations, "
0286 "shocks, and cold temperatures."
0287 msgstr ""
0288 
0289 #: ../../asset_management/data_protection.rst:85
0290 msgid ""
0291 "If your disk is making weird noises, normal file recovery software isn’t "
0292 "going to work. Do a quick backup if that is going to happen to you. (Use dd "
0293 "utility if possible, not a normal file backup since dd reads in a smooth, "
0294 "spiraling stream from beginning to end and doesn't stress the mechanics). "
0295 "There are specialist companies that can recover data from otherwise "
0296 "destroyed drive, but they are very expensive."
0297 msgstr ""
0298 
0299 #: ../../asset_management/data_protection.rst:87
0300 msgid ""
0301 "Linux `SmartMonTools <https://en.wikipedia.org/wiki/Smartmontools>`_ suite "
0302 "allows to query the storage hardware devices for future failure. We highly "
0303 "recommend to use this kind of tool on your computer."
0304 msgstr ""
0305 
0306 #: ../../asset_management/data_protection.rst:90
0307 msgid "Solid State Drives"
0308 msgstr ""
0309 
0310 #: ../../asset_management/data_protection.rst:92
0311 msgid ""
0312 "`SSDs <https://en.wikipedia.org/wiki/Solid-state_drive>`_ are mechanically "
0313 "more robust than HDDs and suffer much less on that front when they are "
0314 "plugged into the computer. They will replace HDD in time as capacity, "
0315 "robustest, and price become more and more a good solution as permanent data "
0316 "storage devices."
0317 msgstr ""
0318 
0319 #: ../../asset_management/data_protection.rst:94
0320 msgid ""
0321 "In case of use as external device, one major cause for data loss (often "
0322 "recoverable) is the unsafe removal of SSDs from a computer. Before data is "
0323 "saved from a computer memory to any attached device, it remains for some "
0324 "time in buffers. In hard drives this means seconds at most, whereas with "
0325 "SSDs it can be tens of minutes. Therefore, before you disconnect a flash "
0326 "device, always activate data flushing through software (often called *safely "
0327 "remove device*)."
0328 msgstr ""
0329 
0330 #: ../../asset_management/data_protection.rst:97
0331 msgid "Non-Volatile Memory"
0332 msgstr ""
0333 
0334 #: ../../asset_management/data_protection.rst:99
0335 msgid ""
0336 "`NVM Express (NVMe) <https://en.wikipedia.org/wiki/NVMe>`_ for Non-Volatile "
0337 "Memory is a logical-device interface for accessing a computer's non-volatile "
0338 "storage media attached PCI Express (PCIe) bus. It use same very fast NAND "
0339 "flash memory used in SSDs, but use the M.2 cards interface instead the "
0340 "slower mSATA used with older HDDs."
0341 msgstr ""
0342 
0343 #: ../../asset_management/data_protection.rst:101
0344 msgid ""
0345 "NVMe allows host hardware and software to fully exploit the levels of "
0346 "parallelism possible in modern SSDs. NVMe reduces I/O overhead and brings "
0347 "various performance improvements relative to previous SSDs. mSATA interface "
0348 "protocols were developed for use with far slower HDDs where a very lengthy "
0349 "delay exists between a request and data transfer, where data speeds are much "
0350 "slower than RAM speeds."
0351 msgstr ""
0352 
0353 #: ../../asset_management/data_protection.rst:103
0354 msgid ""
0355 "For a viability viewpoint, as NVMe devices uses the same hardware than SSDs "
0356 "to store data, the robustness must be the same."
0357 msgstr ""
0358 
0359 #: ../../asset_management/data_protection.rst:107
0360 msgid ""
0361 "**In all cases SSDs or NVMe as internal devices are the more modern and "
0362 "efficient solution to host the digiKam databases and the collections.**"
0363 msgstr ""
0364 
0365 #: ../../asset_management/data_protection.rst:110
0366 msgid "Power Supply Failures"
0367 msgstr ""
0368 
0369 #: ../../asset_management/data_protection.rst:113
0370 msgid "Power Surges"
0371 msgstr ""
0372 
0373 #: ../../asset_management/data_protection.rst:115
0374 msgid ""
0375 "As much as 1% of all computers are affected by lightning and power surges "
0376 "every year."
0377 msgstr ""
0378 
0379 #: ../../asset_management/data_protection.rst:117
0380 msgid ""
0381 "This is about total data loss due to power surges. Of course you can have "
0382 "the occasional data loss due to power loss before saving files. But those "
0383 "losses can normally be restored without major difficulty."
0384 msgstr ""
0385 
0386 #: ../../asset_management/data_protection.rst:119
0387 msgid ""
0388 "You don’t have to wait for the next thunderstorm to be concerned about how a "
0389 "sudden fluctuation in electric power may affect your computer system. Recent "
0390 "statistics have shown that as much as 63 percent of all electronics "
0391 "casualties are due to power problems, and most computers are subject to two "
0392 "or more power anomalies a day. Since power surges or blackouts can occur "
0393 "anywhere and at any time, it only makes sense to protect your computer by "
0394 "investing in some sort of surge protection device."
0395 msgstr ""
0396 
0397 #: ../../asset_management/data_protection.rst:122
0398 msgid "How Surges Happen"
0399 msgstr ""
0400 
0401 #: ../../asset_management/data_protection.rst:124
0402 msgid ""
0403 "A power surge occurs when the power line voltage increases over nominal "
0404 "values for more than 10 milliseconds. Sixty percent of all power surges are "
0405 "caused from within the home or office, generally when a device with a motor "
0406 "(such as a hair dryer, refrigerator, or water pump) shuts off and the power "
0407 "it was using is diverted elsewhere as excess voltage. The remaining 40 "
0408 "percent of power surges are generated by factors such as lightning, utility "
0409 "grid switching, line slapping, poor wiring, and so on."
0410 msgstr ""
0411 
0412 #: ../../asset_management/data_protection.rst:126
0413 msgid ""
0414 "While most average electricity-using devices are not affected by power "
0415 "surges, devices relying on computer chips and high-speed microprocessors are "
0416 "susceptible to serious damage. For your computer, power anomalies can result "
0417 "in keyboard lockup, complete data loss, hardware degradation, damaged "
0418 "motherboards, and more. Failure to protect yourself from the inevitable can "
0419 "result in a loss of both time and money."
0420 msgstr ""
0421 
0422 #: ../../asset_management/data_protection.rst:129
0423 msgid "Surge Protectors"
0424 msgstr ""
0425 
0426 #: ../../asset_management/data_protection.rst:131
0427 msgid ""
0428 "The most common defense against power surges is a surge protector or "
0429 "suppressor, a device that works by absorbing some of the excess energy and "
0430 "diverting the rest of it to the ground. These are usually found in the form "
0431 "of a power strip (one of those long devices that have six or so outlets and "
0432 "a single, grounded plug). Bear in mind, however, that not every power strip "
0433 "serves as a surge protector."
0434 msgstr ""
0435 
0436 #: ../../asset_management/data_protection.rst:133
0437 msgid ""
0438 "When selecting your surge protector, you want to be sure it is listed as "
0439 "meeting the UL 1449 standard, which guarantees a certain minimum of "
0440 "protection. You should also look for one that offers protection against "
0441 "lightning (not every one does) and provides insurance for equipment that is "
0442 "properly attached."
0443 msgstr ""
0444 
0445 #: ../../asset_management/data_protection.rst:135
0446 msgid ""
0447 "Because a power surge can follow any path to your computer, be sure that "
0448 "each peripheral connected to your system is protected. This includes your "
0449 "phone line or cable modem, as power can surge through these routes as well. "
0450 "A number of manufacturers are now producing surge suppressors that feature a "
0451 "phone jack for your modem along with the electrical outlets, while others "
0452 "have coaxial cable jacks for those who use a cable modem or TV tuner card."
0453 msgstr ""
0454 
0455 #: ../../asset_management/data_protection.rst:137
0456 msgid ""
0457 "If you have a notebook computer, you will want to carry a surge suppressor "
0458 "as well. A variety of suppressors designed specifically for notebooks are "
0459 "available, small in size and possessing both electric and phone outlets that "
0460 "make them ideal for use on the road."
0461 msgstr ""
0462 
0463 #: ../../asset_management/data_protection.rst:140
0464 msgid "Uninterruptible Power Supply"
0465 msgstr ""
0466 
0467 #: ../../asset_management/data_protection.rst:142
0468 msgid ""
0469 "While a surge suppressor will protect your system from minor fluctuations in "
0470 "the power lines, it won’t help you if the power should black out completely. "
0471 "Even an outage of just a few seconds can result in the loss of valuable "
0472 "data, so you might find it worthwhile to invest in an **Uninterruptible "
0473 "Power Supply** (UPS)."
0474 msgstr ""
0475 
0476 #: ../../asset_management/data_protection.rst:144
0477 msgid ""
0478 "Besides serving as surge suppressors, these devices automatically switch to "
0479 "battery power when a power outage occurs, giving you the opportunity to save "
0480 "data and shut down your system. Some models will even allow you to keep "
0481 "working until power is restored. When purchasing a UPS, be sure that it has "
0482 "the same qualities that you would seek in a surge suppressor, but also check "
0483 "out the battery life and included software."
0484 msgstr ""
0485 
0486 #: ../../asset_management/data_protection.rst:146
0487 msgid ""
0488 "Considering the potential risk to your computing system, ensuring its safety "
0489 "from power disturbances is a worthwhile investment. A quality surge "
0490 "suppressor or a 500W UPS are not too expensive for the peace of mind you’ll "
0491 "gain knowing your computer is well protected. In the very least pull all "
0492 "lines to your computer when you go on holidays."
0493 msgstr ""
0494 
0495 #: ../../asset_management/data_protection.rst:149
0496 msgid "Safeguarding Policy"
0497 msgstr ""
0498 
0499 #: ../../asset_management/data_protection.rst:152
0500 msgid "Web Storage Services"
0501 msgstr ""
0502 
0503 #: ../../asset_management/data_protection.rst:154
0504 msgid ""
0505 "Amazon Web Services includes S3 - Simple Storage Service. With appropriate "
0506 "configuration, you can mount S3 as a drive on Linux, Mac, and Windows "
0507 "systems, allowing you to use it as a backup destination for your favorite "
0508 "software. Google Shared Storage is another popular offer where one can store "
0509 "infinite amount of data."
0510 msgstr ""
0511 
0512 #: ../../asset_management/data_protection.rst:156
0513 msgid ""
0514 "It is expensive compared to hard drives at home. And you have to transfer "
0515 "the images over the (a comparatively slow) Internet."
0516 msgstr ""
0517 
0518 #: ../../asset_management/data_protection.rst:158
0519 msgid ""
0520 "We think as a safeguard against localized data loss of the most essential "
0521 "images it's not a bad idea at all, but it is not a general backup solution, "
0522 "much too slow for that."
0523 msgstr ""
0524 
0525 #: ../../asset_management/data_protection.rst:160
0526 msgid ""
0527 "Google Photo, and Flickr provide online storage services specialist on "
0528 "photographie. Their free space is limited and you don't want to have full "
0529 "resolution images online. But the pro-accounts offer more."
0530 msgstr ""
0531 
0532 #: ../../asset_management/data_protection.rst:162
0533 msgid ""
0534 "In terms of data retention the web space solution is probably pretty safe. "
0535 "Transmission errors are corrected (thanks to the TCP protocol) and the big "
0536 "companies usually have backup included plus distributed storage so that they "
0537 "are disaster proof within themselves."
0538 msgstr ""
0539 
0540 #: ../../asset_management/data_protection.rst:168
0541 msgid "digiKam Provide a Tool to Export Items to iNaturalist Web Service"
0542 msgstr ""
0543 
0544 #: ../../asset_management/data_protection.rst:171
0545 msgid "Transmission Errors"
0546 msgstr ""
0547 
0548 #: ../../asset_management/data_protection.rst:173
0549 msgid ""
0550 "Data does not only get lost from storage devices, it also gets lost when "
0551 "traveling inside the computer or across networks (although the network "
0552 "traffic itself via TCP is error protected). Errors occur on buses and in "
0553 "memory spaces. Consumer hardware has no protection against those bit errors, "
0554 "whereas it is worthwhile to look into such. You can buy ECC (error code "
0555 "correction) protected memory (which is expensive, granted). With `ECC RAM "
0556 "<https://en.wikipedia.org/wiki/ECC_memory>`_ at least the memory will be "
0557 "scrubbed for single bit errors and corrected. Double bit errors would escape "
0558 "that scheme but they occur too infrequently."
0559 msgstr ""
0560 
0561 #: ../../asset_management/data_protection.rst:179
0562 msgid "The Data Workflow Between Application and Storage Media"
0563 msgstr ""
0564 
0565 #: ../../asset_management/data_protection.rst:181
0566 msgid ""
0567 "This diagram depicts the transmission chain elements in a computer, all "
0568 "transitions are susceptible to transmission errors. The Linux `ZFS <https://"
0569 "en.wikipedia.org/wiki/ZFS>`_ and `BTRFS <https://en.wikipedia.org/wiki/"
0570 "Btrfs>`_ file system at least ensure the OS to disk path of data integrity "
0571 "under Linux."
0572 msgstr ""
0573 
0574 #: ../../asset_management/data_protection.rst:183
0575 msgid ""
0576 "The Byte Error Rate (BER) for memory and transmission channels is in the "
0577 "order of 1 in 10 Million (10E-7 bit). That just means that 1 in 3000 images "
0578 "has an error only due to transmission problems. Now how dramatic that is for "
0579 "an image is left to chance, it could mean that the image is destroyed or "
0580 "that a pixel somewhere changed its value, due to the compression used on "
0581 "almost all images one cannot predict the gravity of a single bit error "
0582 "impact. Often one sees some partial images instead of the full image."
0583 msgstr ""
0584 
0585 #: ../../asset_management/data_protection.rst:185
0586 msgid ""
0587 "The worst of all that is that nobody tells you when a transmission error "
0588 "occurs, not your hardware. All those glitches go down unheard until one day "
0589 "you open the photograph, and to your surprise it's broken. It is quite "
0590 "worrisome that there should be no protection within a computer, nobody seems "
0591 "to have thought of it. The Internet (TCP protocol) is much saver as a data "
0592 "path than inside a computer."
0593 msgstr ""
0594 
0595 #: ../../asset_management/data_protection.rst:187
0596 msgid ""
0597 "Flaky power supplies are another source of transmission losses because they "
0598 "create interference with the data streams. With normal files systems those "
0599 "errors go unnoticed."
0600 msgstr ""
0601 
0602 #: ../../asset_management/data_protection.rst:193
0603 msgid "The Storage Media Number of Failure Per Year"
0604 msgstr ""
0605 
0606 #: ../../asset_management/data_protection.rst:195
0607 msgid ""
0608 "Even if you are not overly concerned today with transmission problems, have "
0609 "a look into the future at illustration. Already in 2010 we'll see thousands "
0610 "of errors per year."
0611 msgstr ""
0612 
0613 #: ../../asset_management/data_protection.rst:198
0614 msgid "Future of File-systems"
0615 msgstr ""
0616 
0617 #: ../../asset_management/data_protection.rst:200
0618 msgid ""
0619 "`ZFS <https://en.wikipedia.org/wiki/ZFS>`_ from Oracle seems to be one of "
0620 "two candidates to deal with disk errors on a low level, and it is highly "
0621 "scalable. It is Open Source, heavily patented, comes with an GPL "
0622 "incompatible license, and is available on Linux and macOS."
0623 msgstr ""
0624 
0625 #: ../../asset_management/data_protection.rst:202
0626 msgid ""
0627 "Oracle has also started an initiative with its `BTRFS <https://en.wikipedia."
0628 "org/wiki/Btrfs>`_ file system. It employs the same protection technique as "
0629 "**ZFS** does, and it's available on Linux."
0630 msgstr ""
0631 
0632 #: ../../asset_management/data_protection.rst:205
0633 msgid "Human Errors"
0634 msgstr ""
0635 
0636 #: ../../asset_management/data_protection.rst:208
0637 msgid "Theft And Accidents"
0638 msgstr ""
0639 
0640 #: ../../asset_management/data_protection.rst:210
0641 msgid ""
0642 "Do not underestimate it. Those two factor account for 86% of notebook and "
0643 "46% for desktop system data losses. For notebooks, theft counts for 50% "
0644 "alone."
0645 msgstr ""
0646 
0647 #: ../../asset_management/data_protection.rst:213
0648 msgid "Malware"
0649 msgstr "Malvér"
0650 
0651 #: ../../asset_management/data_protection.rst:215
0652 msgid ""
0653 "Data loss due to viruses is less grave than common wisdom make you believe. "
0654 "It accounts for less damage than theft or re-installations, for example. And "
0655 "it is limited to Microsoft OS users. Apple users experience very few viruses "
0656 "and under Linux they haven't been around for quite some time now."
0657 msgstr ""
0658 
0659 #: ../../asset_management/data_protection.rst:218
0660 msgid "Human and Data Loss"
0661 msgstr ""
0662 
0663 #: ../../asset_management/data_protection.rst:220
0664 msgid ""
0665 "Human error, as in everything, is a major problem in data loss. Take a deep "
0666 "breath and stop. Panic is a common reaction, and people do really stupid "
0667 "things. Experienced users will pull the wrong drive from a `RAID <https://en."
0668 "wikipedia.org/wiki/RAID>`_ array or reformat a drive, destroying all their "
0669 "information. Acting without thinking is dangerous to your data. Stop "
0670 "stressing about the loss and don’t do anything to the disk. Better yet, stop "
0671 "using the computer until you have a plan. Sit down and explain you plan to a "
0672 "laymen or better, laywoman. You will be amazed how many stupid ideas you'll "
0673 "discover yourself in such an exercise."
0674 msgstr ""
0675 
0676 #: ../../asset_management/data_protection.rst:222
0677 msgid ""
0678 "If your disk is making weird noises, normal file recovery software isn’t "
0679 "going to work. Do a quick backup if that is going to happen to you. If the "
0680 "drive is still spinning and you can’t find your data, look for a data "
0681 "recovery utility and backup to another computer or drive. An Universal and "
0682 "powerful solution can be to use  `CloneZilla open-source suite <https://en."
0683 "wikipedia.org/wiki/Clonezilla>`_. The important thing is to download them "
0684 "onto another drive, either on another computer, or onto a USB thumb drive or "
0685 "hard disk. It is good practice to save the recovered data to another disk. "
0686 "`dd tool <https://en.wikipedia.org/wiki/Dd_(Unix)>`_ is your friend on Linux "
0687 "systems."
0688 msgstr ""
0689 
0690 #: ../../asset_management/data_protection.rst:225
0691 msgid "Common Myths Dispelled"
0692 msgstr ""
0693 
0694 #: ../../asset_management/data_protection.rst:227
0695 msgid "We would like to dispel some common myths:"
0696 msgstr ""
0697 
0698 #: ../../asset_management/data_protection.rst:229
0699 msgid ""
0700 "Open Source file systems are less prone to data loss than proprietary "
0701 "systems: Wrong, NTFS is rather a tiny notch better than ext4, ReiserFs, JFS, "
0702 "XFS, to name just the most popular file systems that often come as default "
0703 "storage format disk used by distributions."
0704 msgstr ""
0705 
0706 #: ../../asset_management/data_protection.rst:231
0707 msgid ""
0708 "Journalize files systems prevent data corruption/loss: Wrong, they only "
0709 "speed up the scan process in case of a sudden interrupt during operation and "
0710 "prevent ambiguous states. But if a file was not entirely saved before the "
0711 "mishap, it'll be lost."
0712 msgstr ""
0713 
0714 #: ../../asset_management/data_protection.rst:233
0715 msgid ""
0716 "`RAID <https://en.wikipedia.org/wiki/RAID>`_ systems prevent data corruption/"
0717 "loss: Mostly wrong, **RAID 0 and 1** prevent you from nothing, **RAID 5** "
0718 "can prevent data loss due to disk-failures (but not from disk or file system "
0719 "errors). Many low-end RAID controllers (most mother board controllers are) "
0720 "don’t report problems, figuring you’ll never notice. If you do notice, "
0721 "months later, what is the chance that you’ll know it was the controller’s "
0722 "fault? One insidious problem is corruption of **RAID 5** parity data. It is "
0723 "pretty simple to check a file by reading it and matching the metadata. "
0724 "Checking parity data is much more difficult, so you typically won’t see "
0725 "parity errors until a rebuild. Then, of course, it is too late."
0726 msgstr ""
0727 
0728 #: ../../asset_management/data_protection.rst:235
0729 msgid ""
0730 "Viruses are the biggest thread to digital data: Wrong. Theft, and human "
0731 "errors are the primary cause of data loss."
0732 msgstr ""
0733 
0734 #: ../../asset_management/data_protection.rst:238
0735 msgid "Storage Volume Estimation"
0736 msgstr ""
0737 
0738 #: ../../asset_management/data_protection.rst:240
0739 msgid ""
0740 "Digital camera sensors are 1-2 aperture stops away from fundamental physical "
0741 "limitations. What we mean is this: as technology evolves, there is a natural "
0742 "limit to its progress. Sensitivity and noise characteristics for any kind of "
0743 "light sensor are not far from that limit."
0744 msgstr ""
0745 
0746 #: ../../asset_management/data_protection.rst:242
0747 msgid ""
0748 "Today's cameras tend towards 50 mega pixels sensors, although this "
0749 "resolution is already too high for compact cameras and deteriorates the end "
0750 "result. Given the sensor size and quality of optics, 12 mega pixels are "
0751 "optimum for compact cameras. Even DSLR cameras run into their limits at "
0752 "20-24 mega pixels, for higher resolutions one has to go for full frame "
0753 "sensors (24x36mm) or even bigger formats."
0754 msgstr ""
0755 
0756 #: ../../asset_management/data_protection.rst:244
0757 msgid ""
0758 "So, taking into account the manufacturer mega pixel propaganda it seems save "
0759 "to say that the bulk of future cameras will see less than 30 mega pixels. "
0760 "This gives us an estimation for the necessary storage space per photograph "
0761 "in the long run: <40 MB per image. Even if file versioning will be "
0762 "introduced (grouping of variations of a photograph under one file "
0763 "reference), the trend is to implement scripting of changes so that a small "
0764 "overhead will be recorded only and not a whole different image per version. "
0765 "With faster hardware this concept will see it's maturity quite soon."
0766 msgstr ""
0767 
0768 #: ../../asset_management/data_protection.rst:246
0769 msgid ""
0770 "In order to estimate the amount of storage space you have to plan for, "
0771 "simply determine the number of photographs you take per year (easy with :ref:"
0772 "`digiKam's timeline sidebar tab <timeline_view>`) and multiply it by 40 MB. "
0773 "Most users will keep less than 2000 pictures per year which requires less "
0774 "than 80 GB/year. Assuming that you will change your hard disk (or whatever "
0775 "media in the future) every 4-5 years, the natural increase in storage "
0776 "capacity will suffice to keep you afloat."
0777 msgstr ""
0778 
0779 #: ../../asset_management/data_protection.rst:248
0780 msgid ""
0781 "The more ambitious ones out there will need more space, much more maybe. "
0782 "Think of buying a file server, Giga-Ethernet comes integrated into "
0783 "motherboards today and it's a flick to fetch the files over the local "
0784 "network. Speaking about modern mobos: they now the capability to SATA media "
0785 "through an USB connectors. This makes it really a trifle to buy an external "
0786 "SATA drive and hook it up to your machine. 4000 GB drives will hit the "
0787 "market in 2020. These are terrific compact storage containers for backup "
0788 "swapping: keep one drive at home and one somewhere else."
0789 msgstr ""
0790 
0791 #: ../../asset_management/data_protection.rst:251
0792 msgid "Backup and Recover"
0793 msgstr ""
0794 
0795 #: ../../asset_management/data_protection.rst:253
0796 msgid ""
0797 "A 4 TB HDD is not very expensive today. Do not blame anybody else for data "
0798 "loss. 6% of all PCs will suffer an episode of data loss in any given year. "
0799 "Backup your data often according to a plan, and back it up and test the "
0800 "backup before you do anything dramatic like re-installing your OS, changing "
0801 "disks, resizing partitions and so on."
0802 msgstr ""
0803 
0804 #: ../../asset_management/data_protection.rst:256
0805 msgid "Disaster Prevention"
0806 msgstr ""
0807 
0808 #: ../../asset_management/data_protection.rst:258
0809 msgid ""
0810 "Say, you religiously do your backups every day on a external SATA drive. "
0811 "Then comes the day where lightning strikes. Happy you if the external drive "
0812 "was not connected at that moment."
0813 msgstr ""
0814 
0815 #: ../../asset_management/data_protection.rst:260
0816 msgid ""
0817 "Disasters strike locally and destroy a lot. Forget about airplane crashes: "
0818 "fire, water, electricity, kids and theft are dangerous enough to our data. "
0819 "They usually cover a whole room or house."
0820 msgstr ""
0821 
0822 #: ../../asset_management/data_protection.rst:262
0823 msgid ""
0824 "Therefore disaster control means de-localized storage. Move your backups "
0825 "upstairs, next house, to your bureau (and vise versa), whatever."
0826 msgstr ""
0827 
0828 #: ../../asset_management/data_protection.rst:264
0829 msgid ""
0830 "There is another good aspect to the physical separation: as said above, "
0831 "panic is often the cause of destroying data, even the backup data. Having a "
0832 "backup not at hand right away may safe your ass one day."
0833 msgstr ""
0834 
0835 #: ../../asset_management/data_protection.rst:267
0836 msgid "Backup Technicalities"
0837 msgstr ""
0838 
0839 #: ../../asset_management/data_protection.rst:269
0840 msgid ""
0841 "**Full Backup**: A complete backup of all the files being backed up. It is a "
0842 "snapshot without history, it represents a full copy at one point in time."
0843 msgstr ""
0844 
0845 #: ../../asset_management/data_protection.rst:271
0846 msgid ""
0847 "**Differential Backup**: A backup of only the files that have changed since "
0848 "the last full backup. Constitutes a full snapshot of two points in time: the "
0849 "full backup and the last differential one."
0850 msgstr ""
0851 
0852 #: ../../asset_management/data_protection.rst:273
0853 msgid ""
0854 "**Incremental Backup**: A backup of only the files that have changed since "
0855 "last whatever backup. Constitutes multiple snapshots. You can recreate the "
0856 "original state at any point in time such a backup was made. This comes "
0857 "closest to a versioning system except that it is only sampled and not "
0858 "continuous."
0859 msgstr ""
0860 
0861 #: ../../asset_management/data_protection.rst:276
0862 msgid "Backup The Data"
0863 msgstr ""
0864 
0865 #: ../../asset_management/data_protection.rst:278
0866 msgid "The Best practice at all is to backup the data:"
0867 msgstr ""
0868 
0869 #: ../../asset_management/data_protection.rst:280
0870 msgid "Do a **full backup** in a external storage device."
0871 msgstr ""
0872 
0873 #: ../../asset_management/data_protection.rst:282
0874 msgid "Verify its **data integrity** and put it away (disaster control)."
0875 msgstr ""
0876 
0877 #: ../../asset_management/data_protection.rst:284
0878 msgid "Have another storage device for **frequent backups**."
0879 msgstr ""
0880 
0881 #: ../../asset_management/data_protection.rst:286
0882 msgid ""
0883 "**Swap the devices** every other month after having verified data integrity."
0884 msgstr ""
0885 
0886 #: ../../asset_management/data_protection.rst:289
0887 msgid "A Useful Tool to Backups"
0888 msgstr ""
0889 
0890 #: ../../asset_management/data_protection.rst:291
0891 msgid ""
0892 "Linux `rsync <https://en.wikipedia.org/wiki/Rsync>`_ is a wonderful little "
0893 "utility that's amazingly easy to set up on your machines. Rather than have a "
0894 "scripted FTP session, or some other form of file transfer script - rsync "
0895 "copies only the differences of files that have actually changed, compressed "
0896 "and through ssh if you want to for security. That's a mouthful."
0897 msgstr ""
0898 
0899 #: ../../asset_management/data_protection.rst:293
0900 msgid "A reasonable backup approach for images could be this one:"
0901 msgstr ""
0902 
0903 #: ../../asset_management/data_protection.rst:295
0904 msgid ""
0905 "Backup important images right away (after dumping them to a computer) to "
0906 "optical media."
0907 msgstr ""
0908 
0909 #: ../../asset_management/data_protection.rst:297
0910 msgid "Do daily incremental backup of the work space."
0911 msgstr ""
0912 
0913 #: ../../asset_management/data_protection.rst:299
0914 msgid ""
0915 "Do a weekly differential backup and delete integral backups of week-2 (two "
0916 "weeks ago)."
0917 msgstr ""
0918 
0919 #: ../../asset_management/data_protection.rst:301
0920 msgid "Do a monthly differential backup and delete backup of month-2."
0921 msgstr ""
0922 
0923 #: ../../asset_management/data_protection.rst:303
0924 msgid ""
0925 "If not physically separated already, separate it now (swapping-in another "
0926 "backup drive)."
0927 msgstr ""
0928 
0929 #: ../../asset_management/data_protection.rst:305
0930 msgid ""
0931 "This protocol tries to leave you enough time to spot losses and to recover "
0932 "fully at the same time keeping the backup volume at <130% of the working "
0933 "space. You end up with a daily version of the last 7-14 days, a weekly "
0934 "snapshot for at least one month, and a snapshot of every month. Any more "
0935 "thinning should be done by hand after a full verification. Preserve your "
0936 "images through the changes of technology and owners"
0937 msgstr ""
0938 
0939 #: ../../asset_management/data_protection.rst:308
0940 msgid ""
0941 "In order for your valuable images to **survive the next 40 years** or so "
0942 "(because that's about the time that you will become really interested to "
0943 "revisit those nice old photographs of you as a child, adolescent etc.) there "
0944 "are two strategies to be observed:"
0945 msgstr ""
0946 
0947 #: ../../asset_management/data_protection.rst:310
0948 msgid ""
0949 "**Keep up with technology**, don't lag behind more than a couple of years."
0950 msgstr ""
0951 
0952 #: ../../asset_management/data_protection.rst:312
0953 msgid "Save your photos in an open, **non-proprietary standard**."
0954 msgstr ""
0955 
0956 #: ../../asset_management/data_protection.rst:315
0957 msgid "Keep Up With Technology"
0958 msgstr ""
0959 
0960 #: ../../asset_management/data_protection.rst:317
0961 msgid ""
0962 "As the future is unforeseeable by nature, everything said today is to be "
0963 "taken with caution, and to be reviewed as we advance. Unfortunately there is "
0964 "no shortcut possible to some basic vigilance. Every 5-8 years at least one "
0965 "should ask oneself the question of backwards compatibility of current "
0966 "systems. The less variants we used in the past the less questions are to be "
0967 "answered in the future."
0968 msgstr ""
0969 
0970 #: ../../asset_management/data_protection.rst:319
0971 msgid ""
0972 "Of course every time you change your computer system (machine, operating "
0973 "system, applications, DRM) you have to ask yourself the same questions. "
0974 "Today, if you want to switch to Windows, you have to ask yourself three "
0975 "times if you still can import your pictures, and, more important so, if you "
0976 "are ever able to move them onto some other system or machine. Chances are "
0977 "good that you cannot. We see many people struggling around us, because "
0978 "Windows enforces a strict DRM regime. How can you proof to Windows that you "
0979 "are actually the owner of your pictures copyright?"
0980 msgstr ""
0981 
0982 #: ../../asset_management/data_protection.rst:321
0983 msgid ""
0984 "Basically the questions should be answered along the line explained in this "
0985 "document: use and change to open standards supported by a manifold of "
0986 "applications."
0987 msgstr ""
0988 
0989 #: ../../asset_management/data_protection.rst:323
0990 msgid ""
0991 "Virtualization becomes available now for everybody. So if you have an old "
0992 "system that is important for reading your images, keep it, install it as a "
0993 "virtual machine for later."
0994 msgstr ""
0995 
0996 #: ../../asset_management/data_protection.rst:325
0997 msgid ""
0998 "Otherwise the advice is quite simple: every time you change your computer "
0999 "architecture, your storage and backup technology, your file format, check it "
1000 "out, go through your library and convert to a newer standard if necessary. "
1001 "And keep to open standards."
1002 msgstr ""
1003 
1004 #: ../../asset_management/data_protection.rst:328
1005 msgid "Scalability"
1006 msgstr ""
1007 
1008 #: ../../asset_management/data_protection.rst:330
1009 msgid ""
1010 "Scalability is the tech-geek expression of the (easy) capability of a system "
1011 "to be resized, which always means up-sized."
1012 msgstr ""
1013 
1014 #: ../../asset_management/data_protection.rst:332
1015 msgid ""
1016 "Lets assume you planned for scalability and dedicated the container you want "
1017 "to increase to a separate disk or partition. On Linux system you then can "
1018 "copy and resize the container to the new disk."
1019 msgstr ""
1020 
1021 #: ../../asset_management/data_protection.rst:337
1022 msgid "Use Open File Formats"
1023 msgstr ""
1024 
1025 #: ../../asset_management/data_protection.rst:339
1026 msgid ""
1027 "The short history of the digital era in the past 20 years has proven over "
1028 "and over again that proprietary formats are not the way to go when you want "
1029 "your data to be intelligible 10 years into the future. Microsoft is "
1030 "certainly the well known culprit of that sort because of its domineering "
1031 "market share. But other companies are actually (if inadvertently) worse "
1032 "since they may not stay long enough in the market at all or have a small "
1033 "user/contributor base only. In the case of Microsoft one has at least the "
1034 "advantage of many people sharing the same problems. Finding a solution has "
1035 "therefore much more success. Still, in some cases Microsoft is using Open "
1036 "Source documentation to understand their own systems, so badly maintained "
1037 "have been their own documentation. Usually with any given MSoffice suite one "
1038 "cannot properly read a document created with the same application two major "
1039 "versions earlier."
1040 msgstr ""
1041 
1042 #: ../../asset_management/data_protection.rst:341
1043 msgid ""
1044 "Image formats have had a longer live time than office documents and are a "
1045 "bit less affected by obsolescence."
1046 msgstr ""
1047 
1048 #: ../../asset_management/data_protection.rst:343
1049 msgid ""
1050 "Open Source standards have the huge advantage of having an open "
1051 "specification. Even if one day in the future there'll be no software to read "
1052 "it anymore, one can recreate such software, a task becoming simpler every "
1053 "year."
1054 msgstr ""
1055 
1056 #: ../../asset_management/data_protection.rst:349
1057 msgid "digiKam Image Editor Default Save Settings For Common Image Formats"
1058 msgstr ""
1059 
1060 #: ../../asset_management/data_protection.rst:351
1061 msgid ""
1062 "**JPEG** has been around for a while now, and whilst it's a lossy format "
1063 "losing a bit every time you make a modification and save it, it is "
1064 "ubiquitous, supports JFIF, Exif, IPTC and XMP metadata, has good compression "
1065 "ratios and can be read by all imaging software. Because of its metadata "
1066 "limitation, lossy nature, absence of transparency and 8 bit color channel "
1067 "depth, we do not recommend it. JPEG2000 is better, can be employed lossless, "
1068 "but lacks in user base."
1069 msgstr ""
1070 
1071 #: ../../asset_management/data_protection.rst:353
1072 msgid ""
1073 "**GIF** is a proprietary. patented format and slowly disappearing from the "
1074 "market. Don't use it."
1075 msgstr ""
1076 
1077 #: ../../asset_management/data_protection.rst:355
1078 msgid ""
1079 "**PNG** has been invented as a Open Source standard to replace GIF, but it "
1080 "does much more. It is lossless, supports XMP, Exif and IPTC metadata, 16 bit "
1081 "color encoding and full transparency. PNG can store gamma and chromaticity "
1082 "data for improved color matching on heterogeneous platforms. Its drawback "
1083 "are a relatively big footprints (but smaller than TIFF) and slow "
1084 "compression. We recommend it."
1085 msgstr ""
1086 
1087 #: ../../asset_management/data_protection.rst:357
1088 msgid ""
1089 "**TIFF** has been widely accepted as an image format. TIFF can exist in "
1090 "uncompressed form or in a container using a lossless compression algorithm "
1091 "(Deflate). It maintains high image quality but at the expense of much larger "
1092 "file sizes. Some cameras let you save your images in this format. The "
1093 "problem is that the format has been altered by so many people that there are "
1094 "now 50 or more flavors and not all are recognizable by all applications."
1095 msgstr ""
1096 
1097 #: ../../asset_management/data_protection.rst:359
1098 msgid ""
1099 "**PGF** for Progressive Graphics File is another not so known but open file "
1100 "image format. Wavelet-based, it allows lossless and lossy data compression. "
1101 "PGF compares well with **JPEG 2000** but it was developed for speed "
1102 "(compression/decompression) rather than to be the best at compression ratio. "
1103 "At the same file size a PGF file looks significantly better than a JPEG one, "
1104 "while remaining very good at progressive display too. PGF format is used "
1105 "internally in digiKam to store compressed thumbnails in the database. For "
1106 "more information about the PGF format see the `libPGF homepage <https://"
1107 "libpgf.org/>`_"
1108 msgstr ""
1109 
1110 #: ../../asset_management/data_protection.rst:365
1111 msgid "digiKam Image Editor Raw Import Tool"
1112 msgstr ""
1113 
1114 #: ../../asset_management/data_protection.rst:367
1115 msgid ""
1116 "**RAW** format. Some, typically more expensive, cameras support RAW format "
1117 "shooting. The RAW format is not really an image standard at all, it is a "
1118 "container format which is different for every brand and camera model. RAW "
1119 "format images contain minimally processed data from the image sensor of a "
1120 "digital camera or image scanner. Raw image files are sometimes called "
1121 "digital negatives, as they fulfill the same role as film negatives in "
1122 "traditional chemical photography: that is, the negative is not directly "
1123 "usable as an image, but has all of the information needed to create an "
1124 "image. Storing photographs in a camera's RAW format provides for higher "
1125 "dynamic range and allows you to alter settings, such as white balance, after "
1126 "the photograph has been taken. Most professional photographers use RAW "
1127 "format, because it offers them maximum flexibility. The downside is that RAW "
1128 "image files can be very large indeed."
1129 msgstr ""
1130 
1131 #: ../../asset_management/data_protection.rst:369
1132 msgid ""
1133 "We recommend clearly to **abstain from archiving in RAW format** (as opposed "
1134 "to shooting in RAW format, which we recommend). It has all bad ingredients: "
1135 "many varieties and proprietary nature. It is clear that in a few years time "
1136 "you cannot use your old RAW files anymore. We have already seen people "
1137 "changing camera, losing their color profiles and having great difficulty to "
1138 "treat their old RAW files correctly. Better change to DNG format."
1139 msgstr ""
1140 
1141 #: ../../asset_management/data_protection.rst:371
1142 msgid ""
1143 "**DNG** or Digital Negative file format is a royalty free and open RAW image "
1144 "format designed by Adobe Systems. DNG was a response to demand for a "
1145 "unifying camera raw file format. It is based on the TIFF/EP format, and "
1146 "mandates use of metadata. A handful of camera manufacturers have adopted DNG "
1147 "already, let's hope that the main contenders Canon and Nikon will use it one "
1148 "day. `Apple ProRAW <https://support.apple.com/en-us/HT211965>`_ format "
1149 "available since the iPhone 12 Pro Max is based on DNG."
1150 msgstr ""
1151 
1152 #: ../../asset_management/data_protection.rst:377
1153 msgid ""
1154 "digiKam Provide a Tool to Convert in Batch RAW to DNG in :ref:`Batch Queue "
1155 "Manager <dng_converter>`"
1156 msgstr ""
1157 
1158 #: ../../asset_management/data_protection.rst:379
1159 msgid ""
1160 "We strongly recommend converting RAW files to DNG for archiving. Despite the "
1161 "fact that DNG was created by Adobe, it is an open standard and widely "
1162 "embraced by the Open Source community (which is usually a good indicator of "
1163 "perennial properties). Some manufacturers have already adopted DNG as RAW "
1164 "format. And last not least, Adobe is the most important source of graphical "
1165 "software today, and they of course support their own invention. It is an "
1166 "ideal archival format, the raw sensor data will be preserved as such in TIFF "
1167 "format inside DNG, so that the risk associated with proprietary RAW formats "
1168 "is alleviated. All of this makes migration to another operating system a no-"
1169 "brainer."
1170 msgstr ""
1171 
1172 #: ../../asset_management/data_protection.rst:385
1173 msgid ""
1174 "digiKam Provide Tools to Convert RAW to DNG during :ref:`Download from "
1175 "Camera <camera_dngconvert>`"
1176 msgstr ""
1177 
1178 #: ../../asset_management/data_protection.rst:387
1179 msgid ""
1180 "**XML** for Extensible Mark-up Language or **RDF** for Resource Description "
1181 "Framework. XML is like HTML, but where HTML is mostly concerned with the "
1182 "presentation of data, XML is concerned with the *representation* of data. On "
1183 "top of that, XML is non-proprietary, operating-system-independent, fairly "
1184 "simple to interpret, text-based and cheap. RDF is the WC3's solution to "
1185 "integrate a variety of different applications such as library catalogs, "
1186 "world-wide directories, news feeds, software, as well as collections of "
1187 "music, images, and events using XML as an interchange syntax. Together the "
1188 "specifications provide a method that uses a lightweight ontology based on "
1189 "the Dublin Core which also supports the \"Semantic Web\" (easy exchange of "
1190 "knowledge on the Web)."
1191 msgstr ""
1192 
1193 #: ../../asset_management/data_protection.rst:390
1194 msgid "IPTC Goes XMP"
1195 msgstr ""
1196 
1197 #: ../../asset_management/data_protection.rst:392
1198 msgid ""
1199 "That's probably one of the reasons why, around 2001, that Adobe introduced "
1200 "its XML based XMP technology to replace the *Image Resource Block* "
1201 "technology of the nineties. XMP stands for **Extensible Metadata Platform**, "
1202 "a mixture of XML and RDF. It is a labeling technology that lets users embed "
1203 "data about a file in the file itself, the file info is saved using the "
1204 "extension :file:`*.xmp*` (signifying the use of XML/RDF)."
1205 msgstr ""
1206 
1207 #: ../../asset_management/data_protection.rst:394
1208 msgid ""
1209 "`XMP <https://en.wikipedia.org/wiki/Extensible_Metadata_Platform>`_: As much "
1210 "as ODF will be readable forever (since its containing text is written in "
1211 "clear text), XMP will preserve your metadata in a clearly understandable "
1212 "format XML. No danger here of not being able to read it later. It can be "
1213 "embedded into the image files or as a separate accompanying file "
1214 "(**Sidecar** concept). XMP can be used in PDF, JPEG, JPEG2000, GIF, PNG, "
1215 "HTML, TIFF, Adobe Illustrator, PSD, Postscript, Encapsulated Postscript, and "
1216 "video files. In a typical edited JPEG file, XMP information is typically "
1217 "included alongside Exif and IPTC data."
1218 msgstr ""
1219 
1220 #: ../../asset_management/data_protection.rst:400
1221 msgid "digiKam can display XMP Contents from Image and Video"
1222 msgstr ""
1223 
1224 #: ../../asset_management/data_protection.rst:402
1225 msgid ""
1226 "Embedding metadata in files allows easy sharing and transfer of files across "
1227 "products, vendors, platforms, customers, without metadata getting lost. The "
1228 "most common metadata tags recorded in XMP data are those from the Dublin "
1229 "Core Metadata Initiative, which include things like title, description, "
1230 "creator, and so on. The standard is designed to be extensible, allowing "
1231 "users to add their own custom types of metadata into the XMP data. XMP "
1232 "generally does not allow binary data types to be embedded. This means that "
1233 "any binary data one wants to carry in XMP, such as thumbnail images, must be "
1234 "encoded in some XML-friendly format, such as Base-64."
1235 msgstr ""
1236 
1237 #: ../../asset_management/data_protection.rst:404
1238 msgid ""
1239 "Many photographers prefer keeping an original of their shots (mostly RAW) "
1240 "for the archive. XMP suits that approach as it keeps metadata separate from "
1241 "the image file. We do not share this point of view. There could be problems "
1242 "linking metadata file and image file, and as said above, RAW formats will "
1243 "become obsolete. We recommend using DNG as a container and putting "
1244 "everything inside."
1245 msgstr ""
1246 
1247 #: ../../asset_management/data_protection.rst:406
1248 msgid ""
1249 "The `Dublin Core Metadata Initiative <https://www.dublincore.org/>`_ is an "
1250 "open organization engaged in the development of interoperable online "
1251 "metadata standards that support a broad range of purposes and business "
1252 "models. DCMI's activities include work on architecture and modeling, "
1253 "discussions and collaborative work in DCMI Communities and DCMI Task Groups, "
1254 "annual conferences and workshops, standards liaison, and educational efforts "
1255 "to promote widespread acceptance of metadata standards and practices."
1256 msgstr ""
1257 
1258 #: ../../asset_management/data_protection.rst:412
1259 msgid "digiKam Support Sidecar Files With many Options From Settings Panel"
1260 msgstr ""
1261 
1262 #: ../../asset_management/data_protection.rst:415
1263 msgid "Protect Your Data"
1264 msgstr ""
1265 
1266 #: ../../asset_management/data_protection.rst:417
1267 msgid "Use surge protectors (UL 1449 standard), possibly combined with a UPS."
1268 msgstr ""
1269 
1270 #: ../../asset_management/data_protection.rst:419
1271 msgid ""
1272 "Use ECC memory to verify correct data transmission (even just saving files)."
1273 msgstr ""
1274 
1275 #: ../../asset_management/data_protection.rst:421
1276 msgid "Watch your hard drives (temperature, noise...), make backups."
1277 msgstr ""
1278 
1279 #: ../../asset_management/data_protection.rst:423
1280 msgid "Keep backups at another location, locked up, use web storage space."
1281 msgstr ""
1282 
1283 #: ../../asset_management/data_protection.rst:425
1284 msgid "Use archival media and burners."
1285 msgstr ""
1286 
1287 #: ../../asset_management/data_protection.rst:427
1288 msgid ""
1289 "Don't panic in case of data loss, explain your recovery plan to a layperson."
1290 msgstr ""
1291 
1292 #: ../../asset_management/data_protection.rst:429
1293 msgid ""
1294 "Choose you file system, partitions, folders to cater for easy scalability."
1295 msgstr ""
1296 
1297 #: ../../asset_management/data_protection.rst:431
1298 msgid "Use open, non-proprietary standards to manage and save photographs."
1299 msgstr ""
1300 
1301 #: ../../asset_management/data_protection.rst:433
1302 msgid "Do a technology/migration review at least every 5 years."
1303 msgstr ""