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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 ""