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0001 msgid ""
0002 msgstr ""
0003 "Project-Id-Version: Digikam Manual 8.0.0\n"
0004 "Report-Msgid-Bugs-To: \n"
0005 "POT-Creation-Date: 2023-12-30 00:35+0000\n"
0006 "PO-Revision-Date: 2022-12-29 23:26-0800\n"
0007 "Last-Translator: Japanese KDE translation team <kde-jp@kde.org>\n"
0008 "Language-Team: Japanese <kde-jp@kde.org>\n"
0009 "Language: ja\n"
0010 "MIME-Version: 1.0\n"
0011 "Content-Type: text/plain; charset=UTF-8\n"
0012 "Content-Transfer-Encoding: 8bit\n"
0013 "Plural-Forms: nplurals=1; plural=0;\n"
0014 "X-Accelerator-Marker: &\n"
0015 "X-Text-Markup: kde4\n"
0016 
0017 #: ../../asset_management/data_protection.rst:1
0018 msgid "Protect Your Images from Data Corruption and Loss"
0019 msgstr ""
0020 
0021 #: ../../asset_management/data_protection.rst:1
0022 msgid ""
0023 "digiKam, documentation, user manual, photo management, open source, free, "
0024 "learn, easy, disk errors, disk failures, power surges, ECC, transmission "
0025 "errors, storage media deterioration, recovery, redundancy, disaster "
0026 "prevention, lifetime, temperature, data size, common myths, metadata, IPTC "
0027 "stored in image files, XMP files associated, keep the originals, storage, "
0028 "scalability, media, retrieval of images and metadata, copying image data "
0029 "over to the next generation of media, applications, operating systems, "
0030 "virtualization, viewing device, use of the www, ZFS, BTRFS"
0031 msgstr ""
0032 
0033 #: ../../asset_management/data_protection.rst:14
0034 msgid "Data Corruption and Loss"
0035 msgstr ""
0036 
0037 #: ../../asset_management/data_protection.rst:16
0038 msgid "Contents"
0039 msgstr ""
0040 
0041 #: ../../asset_management/data_protection.rst:19
0042 msgid "Main Factors of Digital Data Loss"
0043 msgstr ""
0044 
0045 #: ../../asset_management/data_protection.rst:21
0046 msgid ""
0047 "Of course we're not talking about losing Blue-rays on the road or in a fire "
0048 "- that kind of loss is just the same as traditional paper copies or "
0049 "negatives. We are talking about problems with the so called *New Media*."
0050 msgstr ""
0051 
0052 #: ../../asset_management/data_protection.rst:23
0053 msgid ""
0054 "Problems with digital data can roughly be categorized into the following "
0055 "areas of concern:"
0056 msgstr ""
0057 
0058 #: ../../asset_management/data_protection.rst:25
0059 msgid ""
0060 "The physical deterioration of the media (all media deteriorate at different "
0061 "time scales)."
0062 msgstr ""
0063 
0064 #: ../../asset_management/data_protection.rst:27
0065 msgid "Undetected transmission errors during data transfer."
0066 msgstr ""
0067 
0068 #: ../../asset_management/data_protection.rst:29
0069 msgid ""
0070 "The lack of support for long-date, undoubtedly proprietary, digital formats."
0071 msgstr ""
0072 
0073 #: ../../asset_management/data_protection.rst:31
0074 msgid "Ancient hardware."
0075 msgstr ""
0076 
0077 #: ../../asset_management/data_protection.rst:33
0078 msgid ""
0079 "Kroll Ontrack, the worlds largest data recovery firm, have some interesting "
0080 "statistics on what actually causes data loss."
0081 msgstr ""
0082 
0083 #: ../../asset_management/data_protection.rst:36
0084 msgid "Cause of data loss"
0085 msgstr ""
0086 
0087 #: ../../asset_management/data_protection.rst:36
0088 msgid "Perception"
0089 msgstr ""
0090 
0091 #: ../../asset_management/data_protection.rst:36
0092 msgid "Reality"
0093 msgstr ""
0094 
0095 #: ../../asset_management/data_protection.rst:38
0096 msgid "Hardware or system problem"
0097 msgstr ""
0098 
0099 #: ../../asset_management/data_protection.rst:38
0100 msgid "78%"
0101 msgstr ""
0102 
0103 #: ../../asset_management/data_protection.rst:38
0104 msgid "56%"
0105 msgstr ""
0106 
0107 #: ../../asset_management/data_protection.rst:39
0108 msgid "Human error"
0109 msgstr ""
0110 
0111 #: ../../asset_management/data_protection.rst:39
0112 msgid "11%"
0113 msgstr ""
0114 
0115 #: ../../asset_management/data_protection.rst:39
0116 msgid "26%"
0117 msgstr ""
0118 
0119 #: ../../asset_management/data_protection.rst:40
0120 msgid "Software corruption or problem"
0121 msgstr ""
0122 
0123 #: ../../asset_management/data_protection.rst:40
0124 msgid "7%"
0125 msgstr ""
0126 
0127 #: ../../asset_management/data_protection.rst:40
0128 msgid "9%"
0129 msgstr ""
0130 
0131 #: ../../asset_management/data_protection.rst:41
0132 msgid "Computer viruses"
0133 msgstr ""
0134 
0135 #: ../../asset_management/data_protection.rst:41
0136 msgid "2%"
0137 msgstr ""
0138 
0139 #: ../../asset_management/data_protection.rst:41
0140 msgid "4%"
0141 msgstr ""
0142 
0143 #: ../../asset_management/data_protection.rst:42
0144 msgid "Disaster"
0145 msgstr ""
0146 
0147 #: ../../asset_management/data_protection.rst:42
0148 msgid "1-2%"
0149 msgstr ""
0150 
0151 #: ../../asset_management/data_protection.rst:45
0152 msgid "So let us analyze those cases step by step."
0153 msgstr ""
0154 
0155 #: ../../asset_management/data_protection.rst:50
0156 msgid "Storage Deterioration"
0157 msgstr ""
0158 
0159 #: ../../asset_management/data_protection.rst:52
0160 msgid ""
0161 "Devices listed below are sorted by data speed access feature, from the less "
0162 "faster to the most faster."
0163 msgstr ""
0164 
0165 #: ../../asset_management/data_protection.rst:55
0166 msgid "Magnetic Media"
0167 msgstr ""
0168 
0169 #: ../../asset_management/data_protection.rst:57
0170 msgid ""
0171 "Magnetic tapes are used in backup systems, much more in professional "
0172 "environments than in home use. Tapes have issues with data retention and "
0173 "changing technology, but they are safer in one aspect than optical drives: "
0174 "they are less exposed to scratches and dirt and writing deficiencies. On the "
0175 "other hand they are susceptible to magnetic fields. Throw a magnet next to a "
0176 "tape and it's gone. Tapes should be re-copied every 5-8 years, otherwise too "
0177 "many bits will fail and escape the checksum protection. The downside of "
0178 "magnetic tapes is often the recorder price and the restore time (20x longer "
0179 "than from HDD). Tape backup system have seen their best days."
0180 msgstr ""
0181 
0182 #: ../../asset_management/data_protection.rst:60
0183 msgid "Optical Drives"
0184 msgstr ""
0185 
0186 #: ../../asset_management/data_protection.rst:62
0187 msgid ""
0188 "Physical deterioration of the media happens more rapidly with paper and CD-"
0189 "Rs than the average of film. Yet while film lasts longer (sometimes decades "
0190 "longer) than other forms of media, the right kind of backup of digital media "
0191 "never loses anything. Film decays - digital 1's and 0's do not, and film "
0192 "starts to decay the moment it's created and developed. It will never have "
0193 "the same color, contrast, etc. that it did have a moment before. Digital "
0194 "doesn't do that. However, digital is susceptible to corruption. And yes, "
0195 "physical media such as floppies and magnetic hard drives are also "
0196 "susceptible to the decay of the medium, just like CDs are. They just last "
0197 "longer."
0198 msgstr ""
0199 
0200 #: ../../asset_management/data_protection.rst:64
0201 msgid ""
0202 "To combat the problem of optical drives, they need to be properly cared for "
0203 "and not trusted for more than a few years. Thankfully you can purchase "
0204 "archive-quality CDs and DVDs which last longer, though they are much more "
0205 "difficult to obtain and are much more expensive. There are offers out there "
0206 "for gold-plated optical drive, few euros a piece claiming 100 years storage "
0207 "life (if you care to believe it)."
0208 msgstr ""
0209 
0210 #: ../../asset_management/data_protection.rst:66
0211 msgid ""
0212 "Optical disks may become unreadable, but you can reduce the risk using good "
0213 "disks and a good recorder, and storing them in a correct way. The best "
0214 "optical drive recorders are not much more expensive than the cheapest, but "
0215 "they write in a much more reliable way. It's a matter of choosing the right "
0216 "one."
0217 msgstr ""
0218 
0219 #: ../../asset_management/data_protection.rst:68
0220 msgid ""
0221 "Essentially, optical drives are very prone to errors, even in a freshly "
0222 "written state. That's why they are heavily protected with a checksum "
0223 "mechanism (75% of data are effective data, the rest is formatting and "
0224 "checksum overhead). But even with that massive amount of protection they "
0225 "will suffer deterioration from chemical aging, ultra-violet exposure, "
0226 "scratches, dust, etc."
0227 msgstr ""
0228 
0229 #: ../../asset_management/data_protection.rst:70
0230 msgid ""
0231 "For damaged optical drives, Wikipedia `list all common applications <https://"
0232 "en.wikipedia.org/wiki/Data_recovery#List_of_data_recovery_software>`_ "
0233 "designed to get data from damaged floppies, hard drives, flash media such as "
0234 "camera memory and USB drives, and so forth."
0235 msgstr ""
0236 
0237 #: ../../asset_management/data_protection.rst:72
0238 msgid ""
0239 "Dual-layer optical media Blu-ray disk can store 50 GB, almost six times the "
0240 "capacity of a dual layer DVD at 8.5 GB. Everything that has been said about "
0241 "CDs/DVDs applies to Blu-ray disks as well."
0242 msgstr ""
0243 
0244 #: ../../asset_management/data_protection.rst:74
0245 msgid ""
0246 "Best practice: burn them slowly with a good recorder on archive quality "
0247 "media in an open, non-proprietary format, read the data back to verify, "
0248 "label them with some descriptive text + date & author, lock them away where "
0249 "it is clean, dark, animal safe and dry. And do not forget to copy them over "
0250 "to the next generation of media before you throw away your last piece of "
0251 "hardware or software able to read them."
0252 msgstr ""
0253 
0254 #: ../../asset_management/data_protection.rst:77
0255 msgid "Hard Disks"
0256 msgstr ""
0257 
0258 #: ../../asset_management/data_protection.rst:79
0259 msgid ""
0260 "Hard Disk (HDD) manufacturers keep their statistics to themselves. A "
0261 "manufacturer guaranty buys you a new disk, but no data. Google for One has "
0262 "done a large scale study on `HDD <https://en.wikipedia.org/wiki/"
0263 "Hard_disk_drive>`_ failure mechanisms: `Disk Failures study <https://"
0264 "research.google.com/archive/disk_failures.pdf>`_."
0265 msgstr ""
0266 
0267 #: ../../asset_management/data_protection.rst:81
0268 msgid ""
0269 "In a nutshell: Disks run longest when operating between 35°C and 45°C, at "
0270 "lower temperatures the error rates increases dramatically. Controller parts "
0271 "(electronics) are the foremost sources of failure, SMART does not diagnose "
0272 "any of this. Some `SMART <https://en.wikipedia.org/wiki/Self-Monitoring,"
0273 "_Analysis_and_Reporting_Technology>`_ errors are indicative of imminent "
0274 "failure, in particular scan errors and relocation counts. Lifetime "
0275 "expectancy is 4-5 years."
0276 msgstr ""
0277 
0278 #: ../../asset_management/data_protection.rst:83
0279 msgid ""
0280 "In general and contrary to intuition or ecological considerations, running a "
0281 "hard drive permanently results in a longer lifetime than switching it on and "
0282 "off all the time. It has even been reported that aggressive power management "
0283 "spinning down the drive can harm it quickly. Making it working hard shortens "
0284 "the lifetime somewhat. The worst factors for HDD probably are vibrations, "
0285 "shocks, and cold temperatures."
0286 msgstr ""
0287 
0288 #: ../../asset_management/data_protection.rst:85
0289 msgid ""
0290 "If your disk is making weird noises, normal file recovery software isn’t "
0291 "going to work. Do a quick backup if that is going to happen to you. (Use dd "
0292 "utility if possible, not a normal file backup since dd reads in a smooth, "
0293 "spiraling stream from beginning to end and doesn't stress the mechanics). "
0294 "There are specialist companies that can recover data from otherwise "
0295 "destroyed drive, but they are very expensive."
0296 msgstr ""
0297 
0298 #: ../../asset_management/data_protection.rst:87
0299 msgid ""
0300 "Linux `SmartMonTools <https://en.wikipedia.org/wiki/Smartmontools>`_ suite "
0301 "allows to query the storage hardware devices for future failure. We highly "
0302 "recommend to use this kind of tool on your computer."
0303 msgstr ""
0304 
0305 #: ../../asset_management/data_protection.rst:90
0306 msgid "Solid State Drives"
0307 msgstr ""
0308 
0309 #: ../../asset_management/data_protection.rst:92
0310 msgid ""
0311 "`SSDs <https://en.wikipedia.org/wiki/Solid-state_drive>`_ are mechanically "
0312 "more robust than HDDs and suffer much less on that front when they are "
0313 "plugged into the computer. They will replace HDD in time as capacity, "
0314 "robustest, and price become more and more a good solution as permanent data "
0315 "storage devices."
0316 msgstr ""
0317 
0318 #: ../../asset_management/data_protection.rst:94
0319 msgid ""
0320 "In case of use as external device, one major cause for data loss (often "
0321 "recoverable) is the unsafe removal of SSDs from a computer. Before data is "
0322 "saved from a computer memory to any attached device, it remains for some "
0323 "time in buffers. In hard drives this means seconds at most, whereas with "
0324 "SSDs it can be tens of minutes. Therefore, before you disconnect a flash "
0325 "device, always activate data flushing through software (often called *safely "
0326 "remove device*)."
0327 msgstr ""
0328 
0329 #: ../../asset_management/data_protection.rst:97
0330 msgid "Non-Volatile Memory"
0331 msgstr ""
0332 
0333 #: ../../asset_management/data_protection.rst:99
0334 msgid ""
0335 "`NVM Express (NVMe) <https://en.wikipedia.org/wiki/NVMe>`_ for Non-Volatile "
0336 "Memory is a logical-device interface for accessing a computer's non-volatile "
0337 "storage media attached PCI Express (PCIe) bus. It use same very fast NAND "
0338 "flash memory used in SSDs, but use the M.2 cards interface instead the "
0339 "slower mSATA used with older HDDs."
0340 msgstr ""
0341 
0342 #: ../../asset_management/data_protection.rst:101
0343 msgid ""
0344 "NVMe allows host hardware and software to fully exploit the levels of "
0345 "parallelism possible in modern SSDs. NVMe reduces I/O overhead and brings "
0346 "various performance improvements relative to previous SSDs. mSATA interface "
0347 "protocols were developed for use with far slower HDDs where a very lengthy "
0348 "delay exists between a request and data transfer, where data speeds are much "
0349 "slower than RAM speeds."
0350 msgstr ""
0351 
0352 #: ../../asset_management/data_protection.rst:103
0353 msgid ""
0354 "For a viability viewpoint, as NVMe devices uses the same hardware than SSDs "
0355 "to store data, the robustness must be the same."
0356 msgstr ""
0357 
0358 #: ../../asset_management/data_protection.rst:107
0359 msgid ""
0360 "**In all cases SSDs or NVMe as internal devices are the more modern and "
0361 "efficient solution to host the digiKam databases and the collections.**"
0362 msgstr ""
0363 
0364 #: ../../asset_management/data_protection.rst:110
0365 msgid "Power Supply Failures"
0366 msgstr ""
0367 
0368 #: ../../asset_management/data_protection.rst:113
0369 msgid "Power Surges"
0370 msgstr ""
0371 
0372 #: ../../asset_management/data_protection.rst:115
0373 msgid ""
0374 "As much as 1% of all computers are affected by lightning and power surges "
0375 "every year."
0376 msgstr ""
0377 
0378 #: ../../asset_management/data_protection.rst:117
0379 msgid ""
0380 "This is about total data loss due to power surges. Of course you can have "
0381 "the occasional data loss due to power loss before saving files. But those "
0382 "losses can normally be restored without major difficulty."
0383 msgstr ""
0384 
0385 #: ../../asset_management/data_protection.rst:119
0386 msgid ""
0387 "You don’t have to wait for the next thunderstorm to be concerned about how a "
0388 "sudden fluctuation in electric power may affect your computer system. Recent "
0389 "statistics have shown that as much as 63 percent of all electronics "
0390 "casualties are due to power problems, and most computers are subject to two "
0391 "or more power anomalies a day. Since power surges or blackouts can occur "
0392 "anywhere and at any time, it only makes sense to protect your computer by "
0393 "investing in some sort of surge protection device."
0394 msgstr ""
0395 
0396 #: ../../asset_management/data_protection.rst:122
0397 msgid "How Surges Happen"
0398 msgstr ""
0399 
0400 #: ../../asset_management/data_protection.rst:124
0401 msgid ""
0402 "A power surge occurs when the power line voltage increases over nominal "
0403 "values for more than 10 milliseconds. Sixty percent of all power surges are "
0404 "caused from within the home or office, generally when a device with a motor "
0405 "(such as a hair dryer, refrigerator, or water pump) shuts off and the power "
0406 "it was using is diverted elsewhere as excess voltage. The remaining 40 "
0407 "percent of power surges are generated by factors such as lightning, utility "
0408 "grid switching, line slapping, poor wiring, and so on."
0409 msgstr ""
0410 
0411 #: ../../asset_management/data_protection.rst:126
0412 msgid ""
0413 "While most average electricity-using devices are not affected by power "
0414 "surges, devices relying on computer chips and high-speed microprocessors are "
0415 "susceptible to serious damage. For your computer, power anomalies can result "
0416 "in keyboard lockup, complete data loss, hardware degradation, damaged "
0417 "motherboards, and more. Failure to protect yourself from the inevitable can "
0418 "result in a loss of both time and money."
0419 msgstr ""
0420 
0421 #: ../../asset_management/data_protection.rst:129
0422 msgid "Surge Protectors"
0423 msgstr ""
0424 
0425 #: ../../asset_management/data_protection.rst:131
0426 msgid ""
0427 "The most common defense against power surges is a surge protector or "
0428 "suppressor, a device that works by absorbing some of the excess energy and "
0429 "diverting the rest of it to the ground. These are usually found in the form "
0430 "of a power strip (one of those long devices that have six or so outlets and "
0431 "a single, grounded plug). Bear in mind, however, that not every power strip "
0432 "serves as a surge protector."
0433 msgstr ""
0434 
0435 #: ../../asset_management/data_protection.rst:133
0436 msgid ""
0437 "When selecting your surge protector, you want to be sure it is listed as "
0438 "meeting the UL 1449 standard, which guarantees a certain minimum of "
0439 "protection. You should also look for one that offers protection against "
0440 "lightning (not every one does) and provides insurance for equipment that is "
0441 "properly attached."
0442 msgstr ""
0443 
0444 #: ../../asset_management/data_protection.rst:135
0445 msgid ""
0446 "Because a power surge can follow any path to your computer, be sure that "
0447 "each peripheral connected to your system is protected. This includes your "
0448 "phone line or cable modem, as power can surge through these routes as well. "
0449 "A number of manufacturers are now producing surge suppressors that feature a "
0450 "phone jack for your modem along with the electrical outlets, while others "
0451 "have coaxial cable jacks for those who use a cable modem or TV tuner card."
0452 msgstr ""
0453 
0454 #: ../../asset_management/data_protection.rst:137
0455 msgid ""
0456 "If you have a notebook computer, you will want to carry a surge suppressor "
0457 "as well. A variety of suppressors designed specifically for notebooks are "
0458 "available, small in size and possessing both electric and phone outlets that "
0459 "make them ideal for use on the road."
0460 msgstr ""
0461 
0462 #: ../../asset_management/data_protection.rst:140
0463 msgid "Uninterruptible Power Supply"
0464 msgstr ""
0465 
0466 #: ../../asset_management/data_protection.rst:142
0467 msgid ""
0468 "While a surge suppressor will protect your system from minor fluctuations in "
0469 "the power lines, it won’t help you if the power should black out completely. "
0470 "Even an outage of just a few seconds can result in the loss of valuable "
0471 "data, so you might find it worthwhile to invest in an **Uninterruptible "
0472 "Power Supply** (UPS)."
0473 msgstr ""
0474 
0475 #: ../../asset_management/data_protection.rst:144
0476 msgid ""
0477 "Besides serving as surge suppressors, these devices automatically switch to "
0478 "battery power when a power outage occurs, giving you the opportunity to save "
0479 "data and shut down your system. Some models will even allow you to keep "
0480 "working until power is restored. When purchasing a UPS, be sure that it has "
0481 "the same qualities that you would seek in a surge suppressor, but also check "
0482 "out the battery life and included software."
0483 msgstr ""
0484 
0485 #: ../../asset_management/data_protection.rst:146
0486 msgid ""
0487 "Considering the potential risk to your computing system, ensuring its safety "
0488 "from power disturbances is a worthwhile investment. A quality surge "
0489 "suppressor or a 500W UPS are not too expensive for the peace of mind you’ll "
0490 "gain knowing your computer is well protected. In the very least pull all "
0491 "lines to your computer when you go on holidays."
0492 msgstr ""
0493 
0494 #: ../../asset_management/data_protection.rst:149
0495 msgid "Safeguarding Policy"
0496 msgstr ""
0497 
0498 #: ../../asset_management/data_protection.rst:152
0499 msgid "Web Storage Services"
0500 msgstr ""
0501 
0502 #: ../../asset_management/data_protection.rst:154
0503 msgid ""
0504 "Amazon Web Services includes S3 - Simple Storage Service. With appropriate "
0505 "configuration, you can mount S3 as a drive on Linux, Mac, and Windows "
0506 "systems, allowing you to use it as a backup destination for your favorite "
0507 "software. Google Shared Storage is another popular offer where one can store "
0508 "infinite amount of data."
0509 msgstr ""
0510 
0511 #: ../../asset_management/data_protection.rst:156
0512 msgid ""
0513 "It is expensive compared to hard drives at home. And you have to transfer "
0514 "the images over the (a comparatively slow) Internet."
0515 msgstr ""
0516 
0517 #: ../../asset_management/data_protection.rst:158
0518 msgid ""
0519 "We think as a safeguard against localized data loss of the most essential "
0520 "images it's not a bad idea at all, but it is not a general backup solution, "
0521 "much too slow for that."
0522 msgstr ""
0523 
0524 #: ../../asset_management/data_protection.rst:160
0525 msgid ""
0526 "Google Photo, and Flickr provide online storage services specialist on "
0527 "photographie. Their free space is limited and you don't want to have full "
0528 "resolution images online. But the pro-accounts offer more."
0529 msgstr ""
0530 
0531 #: ../../asset_management/data_protection.rst:162
0532 msgid ""
0533 "In terms of data retention the web space solution is probably pretty safe. "
0534 "Transmission errors are corrected (thanks to the TCP protocol) and the big "
0535 "companies usually have backup included plus distributed storage so that they "
0536 "are disaster proof within themselves."
0537 msgstr ""
0538 
0539 #: ../../asset_management/data_protection.rst:168
0540 msgid "digiKam Provide a Tool to Export Items to iNaturalist Web Service"
0541 msgstr ""
0542 
0543 #: ../../asset_management/data_protection.rst:171
0544 msgid "Transmission Errors"
0545 msgstr ""
0546 
0547 #: ../../asset_management/data_protection.rst:173
0548 msgid ""
0549 "Data does not only get lost from storage devices, it also gets lost when "
0550 "traveling inside the computer or across networks (although the network "
0551 "traffic itself via TCP is error protected). Errors occur on buses and in "
0552 "memory spaces. Consumer hardware has no protection against those bit errors, "
0553 "whereas it is worthwhile to look into such. You can buy ECC (error code "
0554 "correction) protected memory (which is expensive, granted). With `ECC RAM "
0555 "<https://en.wikipedia.org/wiki/ECC_memory>`_ at least the memory will be "
0556 "scrubbed for single bit errors and corrected. Double bit errors would escape "
0557 "that scheme but they occur too infrequently."
0558 msgstr ""
0559 
0560 #: ../../asset_management/data_protection.rst:179
0561 msgid "The Data Workflow Between Application and Storage Media"
0562 msgstr ""
0563 
0564 #: ../../asset_management/data_protection.rst:181
0565 msgid ""
0566 "This diagram depicts the transmission chain elements in a computer, all "
0567 "transitions are susceptible to transmission errors. The Linux `ZFS <https://"
0568 "en.wikipedia.org/wiki/ZFS>`_ and `BTRFS <https://en.wikipedia.org/wiki/"
0569 "Btrfs>`_ file system at least ensure the OS to disk path of data integrity "
0570 "under Linux."
0571 msgstr ""
0572 
0573 #: ../../asset_management/data_protection.rst:183
0574 msgid ""
0575 "The Byte Error Rate (BER) for memory and transmission channels is in the "
0576 "order of 1 in 10 Million (10E-7 bit). That just means that 1 in 3000 images "
0577 "has an error only due to transmission problems. Now how dramatic that is for "
0578 "an image is left to chance, it could mean that the image is destroyed or "
0579 "that a pixel somewhere changed its value, due to the compression used on "
0580 "almost all images one cannot predict the gravity of a single bit error "
0581 "impact. Often one sees some partial images instead of the full image."
0582 msgstr ""
0583 
0584 #: ../../asset_management/data_protection.rst:185
0585 msgid ""
0586 "The worst of all that is that nobody tells you when a transmission error "
0587 "occurs, not your hardware. All those glitches go down unheard until one day "
0588 "you open the photograph, and to your surprise it's broken. It is quite "
0589 "worrisome that there should be no protection within a computer, nobody seems "
0590 "to have thought of it. The Internet (TCP protocol) is much saver as a data "
0591 "path than inside a computer."
0592 msgstr ""
0593 
0594 #: ../../asset_management/data_protection.rst:187
0595 msgid ""
0596 "Flaky power supplies are another source of transmission losses because they "
0597 "create interference with the data streams. With normal files systems those "
0598 "errors go unnoticed."
0599 msgstr ""
0600 
0601 #: ../../asset_management/data_protection.rst:193
0602 msgid "The Storage Media Number of Failure Per Year"
0603 msgstr ""
0604 
0605 #: ../../asset_management/data_protection.rst:195
0606 msgid ""
0607 "Even if you are not overly concerned today with transmission problems, have "
0608 "a look into the future at illustration. Already in 2010 we'll see thousands "
0609 "of errors per year."
0610 msgstr ""
0611 
0612 #: ../../asset_management/data_protection.rst:198
0613 msgid "Future of File-systems"
0614 msgstr ""
0615 
0616 #: ../../asset_management/data_protection.rst:200
0617 msgid ""
0618 "`ZFS <https://en.wikipedia.org/wiki/ZFS>`_ from Oracle seems to be one of "
0619 "two candidates to deal with disk errors on a low level, and it is highly "
0620 "scalable. It is Open Source, heavily patented, comes with an GPL "
0621 "incompatible license, and is available on Linux and macOS."
0622 msgstr ""
0623 
0624 #: ../../asset_management/data_protection.rst:202
0625 msgid ""
0626 "Oracle has also started an initiative with its `BTRFS <https://en.wikipedia."
0627 "org/wiki/Btrfs>`_ file system. It employs the same protection technique as "
0628 "**ZFS** does, and it's available on Linux."
0629 msgstr ""
0630 
0631 #: ../../asset_management/data_protection.rst:205
0632 msgid "Human Errors"
0633 msgstr ""
0634 
0635 #: ../../asset_management/data_protection.rst:208
0636 msgid "Theft And Accidents"
0637 msgstr ""
0638 
0639 #: ../../asset_management/data_protection.rst:210
0640 msgid ""
0641 "Do not underestimate it. Those two factor account for 86% of notebook and "
0642 "46% for desktop system data losses. For notebooks, theft counts for 50% "
0643 "alone."
0644 msgstr ""
0645 
0646 #: ../../asset_management/data_protection.rst:213
0647 msgid "Malware"
0648 msgstr ""
0649 
0650 #: ../../asset_management/data_protection.rst:215
0651 msgid ""
0652 "Data loss due to viruses is less grave than common wisdom make you believe. "
0653 "It accounts for less damage than theft or re-installations, for example. And "
0654 "it is limited to Microsoft OS users. Apple users experience very few viruses "
0655 "and under Linux they haven't been around for quite some time now."
0656 msgstr ""
0657 
0658 #: ../../asset_management/data_protection.rst:218
0659 msgid "Human and Data Loss"
0660 msgstr ""
0661 
0662 #: ../../asset_management/data_protection.rst:220
0663 msgid ""
0664 "Human error, as in everything, is a major problem in data loss. Take a deep "
0665 "breath and stop. Panic is a common reaction, and people do really stupid "
0666 "things. Experienced users will pull the wrong drive from a `RAID <https://en."
0667 "wikipedia.org/wiki/RAID>`_ array or reformat a drive, destroying all their "
0668 "information. Acting without thinking is dangerous to your data. Stop "
0669 "stressing about the loss and don’t do anything to the disk. Better yet, stop "
0670 "using the computer until you have a plan. Sit down and explain you plan to a "
0671 "laymen or better, laywoman. You will be amazed how many stupid ideas you'll "
0672 "discover yourself in such an exercise."
0673 msgstr ""
0674 
0675 #: ../../asset_management/data_protection.rst:222
0676 msgid ""
0677 "If your disk is making weird noises, normal file recovery software isn’t "
0678 "going to work. Do a quick backup if that is going to happen to you. If the "
0679 "drive is still spinning and you can’t find your data, look for a data "
0680 "recovery utility and backup to another computer or drive. An Universal and "
0681 "powerful solution can be to use  `CloneZilla open-source suite <https://en."
0682 "wikipedia.org/wiki/Clonezilla>`_. The important thing is to download them "
0683 "onto another drive, either on another computer, or onto a USB thumb drive or "
0684 "hard disk. It is good practice to save the recovered data to another disk. "
0685 "`dd tool <https://en.wikipedia.org/wiki/Dd_(Unix)>`_ is your friend on Linux "
0686 "systems."
0687 msgstr ""
0688 
0689 #: ../../asset_management/data_protection.rst:225
0690 msgid "Common Myths Dispelled"
0691 msgstr ""
0692 
0693 #: ../../asset_management/data_protection.rst:227
0694 msgid "We would like to dispel some common myths:"
0695 msgstr ""
0696 
0697 #: ../../asset_management/data_protection.rst:229
0698 msgid ""
0699 "Open Source file systems are less prone to data loss than proprietary "
0700 "systems: Wrong, NTFS is rather a tiny notch better than ext4, ReiserFs, JFS, "
0701 "XFS, to name just the most popular file systems that often come as default "
0702 "storage format disk used by distributions."
0703 msgstr ""
0704 
0705 #: ../../asset_management/data_protection.rst:231
0706 msgid ""
0707 "Journalize files systems prevent data corruption/loss: Wrong, they only "
0708 "speed up the scan process in case of a sudden interrupt during operation and "
0709 "prevent ambiguous states. But if a file was not entirely saved before the "
0710 "mishap, it'll be lost."
0711 msgstr ""
0712 
0713 #: ../../asset_management/data_protection.rst:233
0714 msgid ""
0715 "`RAID <https://en.wikipedia.org/wiki/RAID>`_ systems prevent data corruption/"
0716 "loss: Mostly wrong, **RAID 0 and 1** prevent you from nothing, **RAID 5** "
0717 "can prevent data loss due to disk-failures (but not from disk or file system "
0718 "errors). Many low-end RAID controllers (most mother board controllers are) "
0719 "don’t report problems, figuring you’ll never notice. If you do notice, "
0720 "months later, what is the chance that you’ll know it was the controller’s "
0721 "fault? One insidious problem is corruption of **RAID 5** parity data. It is "
0722 "pretty simple to check a file by reading it and matching the metadata. "
0723 "Checking parity data is much more difficult, so you typically won’t see "
0724 "parity errors until a rebuild. Then, of course, it is too late."
0725 msgstr ""
0726 
0727 #: ../../asset_management/data_protection.rst:235
0728 msgid ""
0729 "Viruses are the biggest thread to digital data: Wrong. Theft, and human "
0730 "errors are the primary cause of data loss."
0731 msgstr ""
0732 
0733 #: ../../asset_management/data_protection.rst:238
0734 msgid "Storage Volume Estimation"
0735 msgstr ""
0736 
0737 #: ../../asset_management/data_protection.rst:240
0738 msgid ""
0739 "Digital camera sensors are 1-2 aperture stops away from fundamental physical "
0740 "limitations. What we mean is this: as technology evolves, there is a natural "
0741 "limit to its progress. Sensitivity and noise characteristics for any kind of "
0742 "light sensor are not far from that limit."
0743 msgstr ""
0744 
0745 #: ../../asset_management/data_protection.rst:242
0746 msgid ""
0747 "Today's cameras tend towards 50 mega pixels sensors, although this "
0748 "resolution is already too high for compact cameras and deteriorates the end "
0749 "result. Given the sensor size and quality of optics, 12 mega pixels are "
0750 "optimum for compact cameras. Even DSLR cameras run into their limits at "
0751 "20-24 mega pixels, for higher resolutions one has to go for full frame "
0752 "sensors (24x36mm) or even bigger formats."
0753 msgstr ""
0754 
0755 #: ../../asset_management/data_protection.rst:244
0756 msgid ""
0757 "So, taking into account the manufacturer mega pixel propaganda it seems save "
0758 "to say that the bulk of future cameras will see less than 30 mega pixels. "
0759 "This gives us an estimation for the necessary storage space per photograph "
0760 "in the long run: <40 MB per image. Even if file versioning will be "
0761 "introduced (grouping of variations of a photograph under one file "
0762 "reference), the trend is to implement scripting of changes so that a small "
0763 "overhead will be recorded only and not a whole different image per version. "
0764 "With faster hardware this concept will see it's maturity quite soon."
0765 msgstr ""
0766 
0767 #: ../../asset_management/data_protection.rst:246
0768 msgid ""
0769 "In order to estimate the amount of storage space you have to plan for, "
0770 "simply determine the number of photographs you take per year (easy with :ref:"
0771 "`digiKam's timeline sidebar tab <timeline_view>`) and multiply it by 40 MB. "
0772 "Most users will keep less than 2000 pictures per year which requires less "
0773 "than 80 GB/year. Assuming that you will change your hard disk (or whatever "
0774 "media in the future) every 4-5 years, the natural increase in storage "
0775 "capacity will suffice to keep you afloat."
0776 msgstr ""
0777 
0778 #: ../../asset_management/data_protection.rst:248
0779 msgid ""
0780 "The more ambitious ones out there will need more space, much more maybe. "
0781 "Think of buying a file server, Giga-Ethernet comes integrated into "
0782 "motherboards today and it's a flick to fetch the files over the local "
0783 "network. Speaking about modern mobos: they now the capability to SATA media "
0784 "through an USB connectors. This makes it really a trifle to buy an external "
0785 "SATA drive and hook it up to your machine. 4000 GB drives will hit the "
0786 "market in 2020. These are terrific compact storage containers for backup "
0787 "swapping: keep one drive at home and one somewhere else."
0788 msgstr ""
0789 
0790 #: ../../asset_management/data_protection.rst:251
0791 msgid "Backup and Recover"
0792 msgstr ""
0793 
0794 #: ../../asset_management/data_protection.rst:253
0795 msgid ""
0796 "A 4 TB HDD is not very expensive today. Do not blame anybody else for data "
0797 "loss. 6% of all PCs will suffer an episode of data loss in any given year. "
0798 "Backup your data often according to a plan, and back it up and test the "
0799 "backup before you do anything dramatic like re-installing your OS, changing "
0800 "disks, resizing partitions and so on."
0801 msgstr ""
0802 
0803 #: ../../asset_management/data_protection.rst:256
0804 msgid "Disaster Prevention"
0805 msgstr ""
0806 
0807 #: ../../asset_management/data_protection.rst:258
0808 msgid ""
0809 "Say, you religiously do your backups every day on a external SATA drive. "
0810 "Then comes the day where lightning strikes. Happy you if the external drive "
0811 "was not connected at that moment."
0812 msgstr ""
0813 
0814 #: ../../asset_management/data_protection.rst:260
0815 msgid ""
0816 "Disasters strike locally and destroy a lot. Forget about airplane crashes: "
0817 "fire, water, electricity, kids and theft are dangerous enough to our data. "
0818 "They usually cover a whole room or house."
0819 msgstr ""
0820 
0821 #: ../../asset_management/data_protection.rst:262
0822 msgid ""
0823 "Therefore disaster control means de-localized storage. Move your backups "
0824 "upstairs, next house, to your bureau (and vise versa), whatever."
0825 msgstr ""
0826 
0827 #: ../../asset_management/data_protection.rst:264
0828 msgid ""
0829 "There is another good aspect to the physical separation: as said above, "
0830 "panic is often the cause of destroying data, even the backup data. Having a "
0831 "backup not at hand right away may safe your ass one day."
0832 msgstr ""
0833 
0834 #: ../../asset_management/data_protection.rst:267
0835 msgid "Backup Technicalities"
0836 msgstr ""
0837 
0838 #: ../../asset_management/data_protection.rst:269
0839 msgid ""
0840 "**Full Backup**: A complete backup of all the files being backed up. It is a "
0841 "snapshot without history, it represents a full copy at one point in time."
0842 msgstr ""
0843 
0844 #: ../../asset_management/data_protection.rst:271
0845 msgid ""
0846 "**Differential Backup**: A backup of only the files that have changed since "
0847 "the last full backup. Constitutes a full snapshot of two points in time: the "
0848 "full backup and the last differential one."
0849 msgstr ""
0850 
0851 #: ../../asset_management/data_protection.rst:273
0852 msgid ""
0853 "**Incremental Backup**: A backup of only the files that have changed since "
0854 "last whatever backup. Constitutes multiple snapshots. You can recreate the "
0855 "original state at any point in time such a backup was made. This comes "
0856 "closest to a versioning system except that it is only sampled and not "
0857 "continuous."
0858 msgstr ""
0859 
0860 #: ../../asset_management/data_protection.rst:276
0861 msgid "Backup The Data"
0862 msgstr ""
0863 
0864 #: ../../asset_management/data_protection.rst:278
0865 msgid "The Best practice at all is to backup the data:"
0866 msgstr ""
0867 
0868 #: ../../asset_management/data_protection.rst:280
0869 msgid "Do a **full backup** in a external storage device."
0870 msgstr ""
0871 
0872 #: ../../asset_management/data_protection.rst:282
0873 msgid "Verify its **data integrity** and put it away (disaster control)."
0874 msgstr ""
0875 
0876 #: ../../asset_management/data_protection.rst:284
0877 msgid "Have another storage device for **frequent backups**."
0878 msgstr ""
0879 
0880 #: ../../asset_management/data_protection.rst:286
0881 msgid ""
0882 "**Swap the devices** every other month after having verified data integrity."
0883 msgstr ""
0884 
0885 #: ../../asset_management/data_protection.rst:289
0886 msgid "A Useful Tool to Backups"
0887 msgstr ""
0888 
0889 #: ../../asset_management/data_protection.rst:291
0890 msgid ""
0891 "Linux `rsync <https://en.wikipedia.org/wiki/Rsync>`_ is a wonderful little "
0892 "utility that's amazingly easy to set up on your machines. Rather than have a "
0893 "scripted FTP session, or some other form of file transfer script - rsync "
0894 "copies only the differences of files that have actually changed, compressed "
0895 "and through ssh if you want to for security. That's a mouthful."
0896 msgstr ""
0897 
0898 #: ../../asset_management/data_protection.rst:293
0899 msgid "A reasonable backup approach for images could be this one:"
0900 msgstr ""
0901 
0902 #: ../../asset_management/data_protection.rst:295
0903 msgid ""
0904 "Backup important images right away (after dumping them to a computer) to "
0905 "optical media."
0906 msgstr ""
0907 
0908 #: ../../asset_management/data_protection.rst:297
0909 msgid "Do daily incremental backup of the work space."
0910 msgstr ""
0911 
0912 #: ../../asset_management/data_protection.rst:299
0913 msgid ""
0914 "Do a weekly differential backup and delete integral backups of week-2 (two "
0915 "weeks ago)."
0916 msgstr ""
0917 
0918 #: ../../asset_management/data_protection.rst:301
0919 msgid "Do a monthly differential backup and delete backup of month-2."
0920 msgstr ""
0921 
0922 #: ../../asset_management/data_protection.rst:303
0923 msgid ""
0924 "If not physically separated already, separate it now (swapping-in another "
0925 "backup drive)."
0926 msgstr ""
0927 
0928 #: ../../asset_management/data_protection.rst:305
0929 msgid ""
0930 "This protocol tries to leave you enough time to spot losses and to recover "
0931 "fully at the same time keeping the backup volume at <130% of the working "
0932 "space. You end up with a daily version of the last 7-14 days, a weekly "
0933 "snapshot for at least one month, and a snapshot of every month. Any more "
0934 "thinning should be done by hand after a full verification. Preserve your "
0935 "images through the changes of technology and owners"
0936 msgstr ""
0937 
0938 #: ../../asset_management/data_protection.rst:308
0939 msgid ""
0940 "In order for your valuable images to **survive the next 40 years** or so "
0941 "(because that's about the time that you will become really interested to "
0942 "revisit those nice old photographs of you as a child, adolescent etc.) there "
0943 "are two strategies to be observed:"
0944 msgstr ""
0945 
0946 #: ../../asset_management/data_protection.rst:310
0947 msgid ""
0948 "**Keep up with technology**, don't lag behind more than a couple of years."
0949 msgstr ""
0950 
0951 #: ../../asset_management/data_protection.rst:312
0952 msgid "Save your photos in an open, **non-proprietary standard**."
0953 msgstr ""
0954 
0955 #: ../../asset_management/data_protection.rst:315
0956 msgid "Keep Up With Technology"
0957 msgstr ""
0958 
0959 #: ../../asset_management/data_protection.rst:317
0960 msgid ""
0961 "As the future is unforeseeable by nature, everything said today is to be "
0962 "taken with caution, and to be reviewed as we advance. Unfortunately there is "
0963 "no shortcut possible to some basic vigilance. Every 5-8 years at least one "
0964 "should ask oneself the question of backwards compatibility of current "
0965 "systems. The less variants we used in the past the less questions are to be "
0966 "answered in the future."
0967 msgstr ""
0968 
0969 #: ../../asset_management/data_protection.rst:319
0970 msgid ""
0971 "Of course every time you change your computer system (machine, operating "
0972 "system, applications, DRM) you have to ask yourself the same questions. "
0973 "Today, if you want to switch to Windows, you have to ask yourself three "
0974 "times if you still can import your pictures, and, more important so, if you "
0975 "are ever able to move them onto some other system or machine. Chances are "
0976 "good that you cannot. We see many people struggling around us, because "
0977 "Windows enforces a strict DRM regime. How can you proof to Windows that you "
0978 "are actually the owner of your pictures copyright?"
0979 msgstr ""
0980 
0981 #: ../../asset_management/data_protection.rst:321
0982 msgid ""
0983 "Basically the questions should be answered along the line explained in this "
0984 "document: use and change to open standards supported by a manifold of "
0985 "applications."
0986 msgstr ""
0987 
0988 #: ../../asset_management/data_protection.rst:323
0989 msgid ""
0990 "Virtualization becomes available now for everybody. So if you have an old "
0991 "system that is important for reading your images, keep it, install it as a "
0992 "virtual machine for later."
0993 msgstr ""
0994 
0995 #: ../../asset_management/data_protection.rst:325
0996 msgid ""
0997 "Otherwise the advice is quite simple: every time you change your computer "
0998 "architecture, your storage and backup technology, your file format, check it "
0999 "out, go through your library and convert to a newer standard if necessary. "
1000 "And keep to open standards."
1001 msgstr ""
1002 
1003 #: ../../asset_management/data_protection.rst:328
1004 msgid "Scalability"
1005 msgstr ""
1006 
1007 #: ../../asset_management/data_protection.rst:330
1008 msgid ""
1009 "Scalability is the tech-geek expression of the (easy) capability of a system "
1010 "to be resized, which always means up-sized."
1011 msgstr ""
1012 
1013 #: ../../asset_management/data_protection.rst:332
1014 msgid ""
1015 "Lets assume you planned for scalability and dedicated the container you want "
1016 "to increase to a separate disk or partition. On Linux system you then can "
1017 "copy and resize the container to the new disk."
1018 msgstr ""
1019 
1020 #: ../../asset_management/data_protection.rst:337
1021 msgid "Use Open File Formats"
1022 msgstr ""
1023 
1024 #: ../../asset_management/data_protection.rst:339
1025 msgid ""
1026 "The short history of the digital era in the past 20 years has proven over "
1027 "and over again that proprietary formats are not the way to go when you want "
1028 "your data to be intelligible 10 years into the future. Microsoft is "
1029 "certainly the well known culprit of that sort because of its domineering "
1030 "market share. But other companies are actually (if inadvertently) worse "
1031 "since they may not stay long enough in the market at all or have a small "
1032 "user/contributor base only. In the case of Microsoft one has at least the "
1033 "advantage of many people sharing the same problems. Finding a solution has "
1034 "therefore much more success. Still, in some cases Microsoft is using Open "
1035 "Source documentation to understand their own systems, so badly maintained "
1036 "have been their own documentation. Usually with any given MSoffice suite one "
1037 "cannot properly read a document created with the same application two major "
1038 "versions earlier."
1039 msgstr ""
1040 
1041 #: ../../asset_management/data_protection.rst:341
1042 msgid ""
1043 "Image formats have had a longer live time than office documents and are a "
1044 "bit less affected by obsolescence."
1045 msgstr ""
1046 
1047 #: ../../asset_management/data_protection.rst:343
1048 msgid ""
1049 "Open Source standards have the huge advantage of having an open "
1050 "specification. Even if one day in the future there'll be no software to read "
1051 "it anymore, one can recreate such software, a task becoming simpler every "
1052 "year."
1053 msgstr ""
1054 
1055 #: ../../asset_management/data_protection.rst:349
1056 msgid "digiKam Image Editor Default Save Settings For Common Image Formats"
1057 msgstr ""
1058 
1059 #: ../../asset_management/data_protection.rst:351
1060 msgid ""
1061 "**JPEG** has been around for a while now, and whilst it's a lossy format "
1062 "losing a bit every time you make a modification and save it, it is "
1063 "ubiquitous, supports JFIF, Exif, IPTC and XMP metadata, has good compression "
1064 "ratios and can be read by all imaging software. Because of its metadata "
1065 "limitation, lossy nature, absence of transparency and 8 bit color channel "
1066 "depth, we do not recommend it. JPEG2000 is better, can be employed lossless, "
1067 "but lacks in user base."
1068 msgstr ""
1069 
1070 #: ../../asset_management/data_protection.rst:353
1071 msgid ""
1072 "**GIF** is a proprietary. patented format and slowly disappearing from the "
1073 "market. Don't use it."
1074 msgstr ""
1075 
1076 #: ../../asset_management/data_protection.rst:355
1077 msgid ""
1078 "**PNG** has been invented as a Open Source standard to replace GIF, but it "
1079 "does much more. It is lossless, supports XMP, Exif and IPTC metadata, 16 bit "
1080 "color encoding and full transparency. PNG can store gamma and chromaticity "
1081 "data for improved color matching on heterogeneous platforms. Its drawback "
1082 "are a relatively big footprints (but smaller than TIFF) and slow "
1083 "compression. We recommend it."
1084 msgstr ""
1085 
1086 #: ../../asset_management/data_protection.rst:357
1087 msgid ""
1088 "**TIFF** has been widely accepted as an image format. TIFF can exist in "
1089 "uncompressed form or in a container using a lossless compression algorithm "
1090 "(Deflate). It maintains high image quality but at the expense of much larger "
1091 "file sizes. Some cameras let you save your images in this format. The "
1092 "problem is that the format has been altered by so many people that there are "
1093 "now 50 or more flavors and not all are recognizable by all applications."
1094 msgstr ""
1095 
1096 #: ../../asset_management/data_protection.rst:359
1097 msgid ""
1098 "**PGF** for Progressive Graphics File is another not so known but open file "
1099 "image format. Wavelet-based, it allows lossless and lossy data compression. "
1100 "PGF compares well with **JPEG 2000** but it was developed for speed "
1101 "(compression/decompression) rather than to be the best at compression ratio. "
1102 "At the same file size a PGF file looks significantly better than a JPEG one, "
1103 "while remaining very good at progressive display too. PGF format is used "
1104 "internally in digiKam to store compressed thumbnails in the database. For "
1105 "more information about the PGF format see the `libPGF homepage <https://"
1106 "libpgf.org/>`_"
1107 msgstr ""
1108 
1109 #: ../../asset_management/data_protection.rst:365
1110 msgid "digiKam Image Editor Raw Import Tool"
1111 msgstr ""
1112 
1113 #: ../../asset_management/data_protection.rst:367
1114 msgid ""
1115 "**RAW** format. Some, typically more expensive, cameras support RAW format "
1116 "shooting. The RAW format is not really an image standard at all, it is a "
1117 "container format which is different for every brand and camera model. RAW "
1118 "format images contain minimally processed data from the image sensor of a "
1119 "digital camera or image scanner. Raw image files are sometimes called "
1120 "digital negatives, as they fulfill the same role as film negatives in "
1121 "traditional chemical photography: that is, the negative is not directly "
1122 "usable as an image, but has all of the information needed to create an "
1123 "image. Storing photographs in a camera's RAW format provides for higher "
1124 "dynamic range and allows you to alter settings, such as white balance, after "
1125 "the photograph has been taken. Most professional photographers use RAW "
1126 "format, because it offers them maximum flexibility. The downside is that RAW "
1127 "image files can be very large indeed."
1128 msgstr ""
1129 
1130 #: ../../asset_management/data_protection.rst:369
1131 msgid ""
1132 "We recommend clearly to **abstain from archiving in RAW format** (as opposed "
1133 "to shooting in RAW format, which we recommend). It has all bad ingredients: "
1134 "many varieties and proprietary nature. It is clear that in a few years time "
1135 "you cannot use your old RAW files anymore. We have already seen people "
1136 "changing camera, losing their color profiles and having great difficulty to "
1137 "treat their old RAW files correctly. Better change to DNG format."
1138 msgstr ""
1139 
1140 #: ../../asset_management/data_protection.rst:371
1141 msgid ""
1142 "**DNG** or Digital Negative file format is a royalty free and open RAW image "
1143 "format designed by Adobe Systems. DNG was a response to demand for a "
1144 "unifying camera raw file format. It is based on the TIFF/EP format, and "
1145 "mandates use of metadata. A handful of camera manufacturers have adopted DNG "
1146 "already, let's hope that the main contenders Canon and Nikon will use it one "
1147 "day. `Apple ProRAW <https://support.apple.com/en-us/HT211965>`_ format "
1148 "available since the iPhone 12 Pro Max is based on DNG."
1149 msgstr ""
1150 
1151 #: ../../asset_management/data_protection.rst:377
1152 msgid ""
1153 "digiKam Provide a Tool to Convert in Batch RAW to DNG in :ref:`Batch Queue "
1154 "Manager <dng_converter>`"
1155 msgstr ""
1156 
1157 #: ../../asset_management/data_protection.rst:379
1158 msgid ""
1159 "We strongly recommend converting RAW files to DNG for archiving. Despite the "
1160 "fact that DNG was created by Adobe, it is an open standard and widely "
1161 "embraced by the Open Source community (which is usually a good indicator of "
1162 "perennial properties). Some manufacturers have already adopted DNG as RAW "
1163 "format. And last not least, Adobe is the most important source of graphical "
1164 "software today, and they of course support their own invention. It is an "
1165 "ideal archival format, the raw sensor data will be preserved as such in TIFF "
1166 "format inside DNG, so that the risk associated with proprietary RAW formats "
1167 "is alleviated. All of this makes migration to another operating system a no-"
1168 "brainer."
1169 msgstr ""
1170 
1171 #: ../../asset_management/data_protection.rst:385
1172 msgid ""
1173 "digiKam Provide Tools to Convert RAW to DNG during :ref:`Download from "
1174 "Camera <camera_dngconvert>`"
1175 msgstr ""
1176 
1177 #: ../../asset_management/data_protection.rst:387
1178 msgid ""
1179 "**XML** for Extensible Mark-up Language or **RDF** for Resource Description "
1180 "Framework. XML is like HTML, but where HTML is mostly concerned with the "
1181 "presentation of data, XML is concerned with the *representation* of data. On "
1182 "top of that, XML is non-proprietary, operating-system-independent, fairly "
1183 "simple to interpret, text-based and cheap. RDF is the WC3's solution to "
1184 "integrate a variety of different applications such as library catalogs, "
1185 "world-wide directories, news feeds, software, as well as collections of "
1186 "music, images, and events using XML as an interchange syntax. Together the "
1187 "specifications provide a method that uses a lightweight ontology based on "
1188 "the Dublin Core which also supports the \"Semantic Web\" (easy exchange of "
1189 "knowledge on the Web)."
1190 msgstr ""
1191 
1192 #: ../../asset_management/data_protection.rst:390
1193 msgid "IPTC Goes XMP"
1194 msgstr ""
1195 
1196 #: ../../asset_management/data_protection.rst:392
1197 msgid ""
1198 "That's probably one of the reasons why, around 2001, that Adobe introduced "
1199 "its XML based XMP technology to replace the *Image Resource Block* "
1200 "technology of the nineties. XMP stands for **Extensible Metadata Platform**, "
1201 "a mixture of XML and RDF. It is a labeling technology that lets users embed "
1202 "data about a file in the file itself, the file info is saved using the "
1203 "extension :file:`*.xmp*` (signifying the use of XML/RDF)."
1204 msgstr ""
1205 
1206 #: ../../asset_management/data_protection.rst:394
1207 msgid ""
1208 "`XMP <https://en.wikipedia.org/wiki/Extensible_Metadata_Platform>`_: As much "
1209 "as ODF will be readable forever (since its containing text is written in "
1210 "clear text), XMP will preserve your metadata in a clearly understandable "
1211 "format XML. No danger here of not being able to read it later. It can be "
1212 "embedded into the image files or as a separate accompanying file "
1213 "(**Sidecar** concept). XMP can be used in PDF, JPEG, JPEG2000, GIF, PNG, "
1214 "HTML, TIFF, Adobe Illustrator, PSD, Postscript, Encapsulated Postscript, and "
1215 "video files. In a typical edited JPEG file, XMP information is typically "
1216 "included alongside Exif and IPTC data."
1217 msgstr ""
1218 
1219 #: ../../asset_management/data_protection.rst:400
1220 msgid "digiKam can display XMP Contents from Image and Video"
1221 msgstr ""
1222 
1223 #: ../../asset_management/data_protection.rst:402
1224 msgid ""
1225 "Embedding metadata in files allows easy sharing and transfer of files across "
1226 "products, vendors, platforms, customers, without metadata getting lost. The "
1227 "most common metadata tags recorded in XMP data are those from the Dublin "
1228 "Core Metadata Initiative, which include things like title, description, "
1229 "creator, and so on. The standard is designed to be extensible, allowing "
1230 "users to add their own custom types of metadata into the XMP data. XMP "
1231 "generally does not allow binary data types to be embedded. This means that "
1232 "any binary data one wants to carry in XMP, such as thumbnail images, must be "
1233 "encoded in some XML-friendly format, such as Base-64."
1234 msgstr ""
1235 
1236 #: ../../asset_management/data_protection.rst:404
1237 msgid ""
1238 "Many photographers prefer keeping an original of their shots (mostly RAW) "
1239 "for the archive. XMP suits that approach as it keeps metadata separate from "
1240 "the image file. We do not share this point of view. There could be problems "
1241 "linking metadata file and image file, and as said above, RAW formats will "
1242 "become obsolete. We recommend using DNG as a container and putting "
1243 "everything inside."
1244 msgstr ""
1245 
1246 #: ../../asset_management/data_protection.rst:406
1247 msgid ""
1248 "The `Dublin Core Metadata Initiative <https://www.dublincore.org/>`_ is an "
1249 "open organization engaged in the development of interoperable online "
1250 "metadata standards that support a broad range of purposes and business "
1251 "models. DCMI's activities include work on architecture and modeling, "
1252 "discussions and collaborative work in DCMI Communities and DCMI Task Groups, "
1253 "annual conferences and workshops, standards liaison, and educational efforts "
1254 "to promote widespread acceptance of metadata standards and practices."
1255 msgstr ""
1256 
1257 #: ../../asset_management/data_protection.rst:412
1258 msgid "digiKam Support Sidecar Files With many Options From Settings Panel"
1259 msgstr ""
1260 
1261 #: ../../asset_management/data_protection.rst:415
1262 msgid "Protect Your Data"
1263 msgstr ""
1264 
1265 #: ../../asset_management/data_protection.rst:417
1266 msgid "Use surge protectors (UL 1449 standard), possibly combined with a UPS."
1267 msgstr ""
1268 
1269 #: ../../asset_management/data_protection.rst:419
1270 msgid ""
1271 "Use ECC memory to verify correct data transmission (even just saving files)."
1272 msgstr ""
1273 
1274 #: ../../asset_management/data_protection.rst:421
1275 msgid "Watch your hard drives (temperature, noise...), make backups."
1276 msgstr ""
1277 
1278 #: ../../asset_management/data_protection.rst:423
1279 msgid "Keep backups at another location, locked up, use web storage space."
1280 msgstr ""
1281 
1282 #: ../../asset_management/data_protection.rst:425
1283 msgid "Use archival media and burners."
1284 msgstr ""
1285 
1286 #: ../../asset_management/data_protection.rst:427
1287 msgid ""
1288 "Don't panic in case of data loss, explain your recovery plan to a layperson."
1289 msgstr ""
1290 
1291 #: ../../asset_management/data_protection.rst:429
1292 msgid ""
1293 "Choose you file system, partitions, folders to cater for easy scalability."
1294 msgstr ""
1295 
1296 #: ../../asset_management/data_protection.rst:431
1297 msgid "Use open, non-proprietary standards to manage and save photographs."
1298 msgstr ""
1299 
1300 #: ../../asset_management/data_protection.rst:433
1301 msgid "Do a technology/migration review at least every 5 years."
1302 msgstr ""