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0001 #
0002 msgid ""
0003 msgstr ""
0004 "Project-Id-Version: Digikam Manual 8.0.0\n"
0005 "Report-Msgid-Bugs-To: \n"
0006 "POT-Creation-Date: 2023-12-02 00:35+0000\n"
0007 "PO-Revision-Date: 2023-01-14 18:31+0100\n"
0008 "Last-Translator: KDE Francophone <kde-francophone@kde.org>\n"
0009 "Language-Team: French <kde-francophone@kde.org>\n"
0010 "Language: fr\n"
0011 "MIME-Version: 1.0\n"
0012 "Content-Type: text/plain; charset=UTF-8\n"
0013 "Content-Transfer-Encoding: 8bit\n"
0014 "Plural-Forms: nplurals=2; plural=(n > 1);\n"
0015 
0016 #: ../../color_management/working_space.rst:1
0017 msgid "Color Management and Working Space"
0018 msgstr ""
0019 
0020 #: ../../color_management/working_space.rst:1
0021 msgid ""
0022 "digiKam, documentation, user manual, photo management, open source, free, "
0023 "learn, easy, image editor, color management, icc, profile, working space"
0024 msgstr ""
0025 
0026 #: ../../color_management/working_space.rst:14
0027 msgid "The Working Space"
0028 msgstr ""
0029 
0030 #: ../../color_management/working_space.rst:17
0031 msgid "Color Workflow"
0032 msgstr ""
0033 
0034 #: ../../color_management/working_space.rst:19
0035 msgid ""
0036 "So we told digiKam where to find my monitor profile and we have a camera "
0037 "profile that we applied to the image file produced by my RAW processing "
0038 "software. What's the next step in color management?"
0039 msgstr ""
0040 
0041 #: ../../color_management/working_space.rst:21
0042 msgid ""
0043 "You need to choose a working color space so you can edit your image. `Lcms "
0044 "<https://www.littlecms.com/>`_ will transform your image from your camera "
0045 "color space to your chosen working space, via the **Profile Connection "
0046 "Space** specified by your camera color profile. Why cannot to just edit "
0047 "images in the color space described by the camera profile?"
0048 msgstr ""
0049 
0050 #: ../../color_management/working_space.rst:23
0051 msgid ""
0052 "After all, the camera profile should provide the best *fit* to the colors "
0053 "recorded by my camera, as processed by my RAW processing procedure, right? "
0054 "Working spaces, such as sRGB or Adobe RGB, are color spaces that facilitate "
0055 "good results while editing. For instance, pixels with equal values of RGB "
0056 "should appear neutral. This just want means that for any given pixel in an "
0057 "image that has been converted to a suitable working space, if R=G=B you "
0058 "should see grey or black or white on your screen. Many camera profiles "
0059 "violate this *neutral* condition."
0060 msgstr ""
0061 
0062 #: ../../color_management/working_space.rst:29
0063 msgid ""
0064 "digiKam Image Editor has a Menu to Switch Quickly an Image from a Color "
0065 "Space to Another one"
0066 msgstr ""
0067 
0068 #: ../../color_management/working_space.rst:31
0069 msgid ""
0070 "However, there is one other good reason to not want to edit your image in "
0071 "your camera profile color space. If you look at the size of a typical camera "
0072 "profile, it is on the order of a quarter to a half a megabyte or more. It's "
0073 "got a lot of information about all the changes that need to be made at "
0074 "different regions of color and tonality in the original scene, to get "
0075 "accurate color rendition from the RGB values that come out of the RAW "
0076 "processor. The camera profile is accurate (at least for colors in the "
0077 "original target) but not particularly mathematically smooth. Working space "
0078 "color profiles, on the other hand, are very small in size (half a kilobyte "
0079 "instead of half a megabyte) because they describe a color gamut in terms of "
0080 "smooth, continuous mathematical functions. Working space profiles don't need "
0081 "to make allowances for the *messiness* of real world sensors, so the "
0082 "mathematical manipulations performed during image editing will go much more "
0083 "smoothly and accurately than if you try to edit your image while it is still "
0084 "in the camera color space."
0085 msgstr ""
0086 
0087 #: ../../color_management/working_space.rst:33
0088 msgid "Working Space Profiles are characterized by:"
0089 msgstr ""
0090 
0091 #: ../../color_management/working_space.rst:35
0092 msgid ""
0093 "**Gamma** transfer function, which dictates how much the original linear "
0094 "intensity values captured by the camera sensor are altered to make editing "
0095 "easier or more precise. These values from the camera are subjected to the in-"
0096 "camera A-to-D conversion, then interpolated by the RAW processing program to "
0097 "produce the image file."
0098 msgstr ""
0099 
0100 #: ../../color_management/working_space.rst:37
0101 msgid ""
0102 "RGB primaries which dictate the range of colors, that is, the color "
0103 "**Gamut**, covered by a given profile."
0104 msgstr ""
0105 
0106 #: ../../color_management/working_space.rst:39
0107 msgid ""
0108 "**White point**, usually D50 or D65 though other values may be used, which "
0109 "specifies the white point color temperature of the working space."
0110 msgstr ""
0111 
0112 #: ../../color_management/working_space.rst:42
0113 msgid "Confusions Terminology"
0114 msgstr ""
0115 
0116 #: ../../color_management/working_space.rst:44
0117 msgid ""
0118 "Before talking more about working spaces, some confusions and confusing "
0119 "terminology needs to be cleared up:"
0120 msgstr ""
0121 
0122 #: ../../color_management/working_space.rst:46
0123 msgid ""
0124 "sRGB is both a working color space and an output color space for images "
0125 "intended for the web and for monitor display. If you have a spiffy new "
0126 "monitor with a gamut larger than the gamut covered by sRGB, obviously you "
0127 "might want to reconsider what output profile to use to best take advantage "
0128 "of your wonderful and hopefully calibrated and profiled monitor, but please "
0129 "convert your image to sRGB before sending it on to your friends. sRGB is "
0130 "also the color space that a lot of home and mass-production commercial "
0131 "printers expect image files to be in when sent to the printer. It is also "
0132 "the color space that most programs assume if an image does not have an "
0133 "embedded color profile telling the program what color space should be used "
0134 "to interpret (translate) the RGB numbers. So if you choose to not use color-"
0135 "management, your color-management choices are simple - set everything to "
0136 "sRGB."
0137 msgstr ""
0138 
0139 #: ../../color_management/working_space.rst:48
0140 msgid ""
0141 "All JPEGs coming straight out of a camera (even if produced by point-and-"
0142 "shoots cameras that don't allow you to save a RAW file) start life inside "
0143 "the camera as a RAW file produced by the camera's A to D converter. The "
0144 "processor inside the camera interpolates the RAW file, assigns a camera "
0145 "profile, translates the resulting RGB numbers to a working space (usually "
0146 "sRGB but sometimes you can choose AdobeRGB, depending on the camera), does "
0147 "the JPEG compression, and stores the JPEG file on your camera card. So JPEGs "
0148 "from your camera never need to be assigned a camera or input profile which "
0149 "is then translated to a working space via a Profile Connection Space. JPEGs "
0150 "from a camera are already in a working space."
0151 msgstr ""
0152 
0153 #: ../../color_management/working_space.rst:50
0154 msgid ""
0155 "In case anyone is unsure on this point, note that an interpolated RAW file "
0156 "is no longer a RAW file - it has been interpolated and then output as a TIFF "
0157 "whose RGB values need to be translated to a working space, using the camera "
0158 "profile, the Profile Connection Space, and Lcms."
0159 msgstr ""
0160 
0161 #: ../../color_management/working_space.rst:52
0162 msgid ""
0163 "To introduce a bit of commonly heard color-management terminology here - the "
0164 "camera profile and your printer's color profile are both device dependent, "
0165 "whereas the working space will be device-independent - it can be used with "
0166 "any image, with any properly color-managed software, without regard for "
0167 "where the image originated."
0168 msgstr ""
0169 
0170 #: ../../color_management/working_space.rst:54
0171 msgid ""
0172 "Above we have used the words translate and translation as a descriptive "
0173 "metaphor for what Lcms does when it translates RGB values from one color "
0174 "space to another via the Profile Connection Space. The usual and correct "
0175 "terminology is convert and conversion. The four methods of conversion from "
0176 "one color space to another are: perceptual, relative colorimetric, absolute "
0177 "colorimetric, and saturation. Which method of conversion you should use for "
0178 "any given image processing step from RAW file to final output image is "
0179 "beyond the scope of this manual. The standard advice is: when in doubt, use "
0180 "perceptual."
0181 msgstr ""
0182 
0183 #: ../../color_management/working_space.rst:56
0184 msgid ""
0185 "Assign a profile means change the meaning of the RGB numbers in an image by "
0186 "embedding a new profile without changing the actual RGB numbers associated "
0187 "with each pixel in the image; convert means embed a new profile, but also "
0188 "change the RGB numbers at the same time so that the meaning of the RGB "
0189 "values - that is, the real-world visible color represented by the trio of "
0190 "RGB numbers associated with each pixel in an image - remains the same before "
0191 "and after the conversion from one space to another. You should be able to do "
0192 "multiple conversions of an image from one working space to another, and with "
0193 "a properly color-managed image editor, even though all the RGB numbers in "
0194 "the image will change with each conversion, the image on your screen should "
0195 "look the same (leaving aside the usually unnoticeable small but inevitable "
0196 "changes from accumulated gamut mismatches and mathematical rounding errors). "
0197 "However, every time you assign a new working space profile rather than "
0198 "convert to a new working space, the appearance of the image should more or "
0199 "less drastically change."
0200 msgstr ""
0201 
0202 #: ../../color_management/working_space.rst:58
0203 msgid ""
0204 "Color management is not only relevant if you shoot RAW. Color management "
0205 "affects every stage of the image processing pipeline, whether you start with "
0206 "a RAW file that you, yourself interpolate and translate into a TIFF, or if "
0207 "you start with a JPEG or TIFF produced by your camera."
0208 msgstr ""
0209 
0210 #: ../../color_management/working_space.rst:61
0211 msgid "Selecting a Working Space"
0212 msgstr ""
0213 
0214 #: ../../color_management/working_space.rst:63
0215 msgid ""
0216 "Which working space do you need to use in digiKam? Working spaces, such as "
0217 "sRGB or Adobe RGB, are color spaces that facilitate good results while "
0218 "editing. For instance, pixels with equal values of RGB should appear "
0219 "neutral. Using a large gamut working space will lead to posterization, while "
0220 "using a small working space will lead to clipping. This trade-off is a "
0221 "consideration for the Image Editor."
0222 msgstr ""
0223 
0224 #: ../../color_management/working_space.rst:65
0225 msgid "Most working space profiles are characterized by:"
0226 msgstr ""
0227 
0228 #: ../../color_management/working_space.rst:67
0229 msgid ""
0230 "The place of the gamut into the **Diagram** `(1)` of all colors visible to "
0231 "the average human eyes."
0232 msgstr ""
0233 
0234 #: ../../color_management/working_space.rst:69
0235 msgid ""
0236 "The **Gamut** `(2)` triangle to define the range of RGB colors of the "
0237 "profile. Red point is on the bottom right corner, Green is on the top, Blue "
0238 "is on the left bottom. Values given around the edge of the gamut passing "
0239 "from the blue, the green and the red points, are the spectral colors in "
0240 "nanometers."
0241 msgstr ""
0242 
0243 #: ../../color_management/working_space.rst:71
0244 msgid ""
0245 "The **White point** `(3)` to define the total dynamic range of the profile."
0246 msgstr ""
0247 
0248 #: ../../color_management/working_space.rst:73
0249 msgid ""
0250 "The **Gamma** to define the transfer function of the profile (not displayed "
0251 "in the gamut)."
0252 msgstr ""
0253 
0254 #: ../../color_management/working_space.rst:79
0255 msgid "The Color Profile Details of CIE Chromaticity Diagram Show in digiKam"
0256 msgstr ""
0257 
0258 #: ../../color_management/working_space.rst:81
0259 msgid ""
0260 "The practical consequences that result from using different RGB primaries, "
0261 "leading to larger or smaller working spaces, are discussed below. The "
0262 "practical consequences for different choices for the working space white "
0263 "point are beyond the scope of this manual. Here we will talk a little bit "
0264 "about the practical consequences of the working space gamma."
0265 msgstr ""
0266 
0267 #: ../../color_management/working_space.rst:83
0268 msgid ""
0269 "The gamma of a color profile dictates what power transform needs to take "
0270 "place to properly convert from an image's embedded color profile (perhaps "
0271 "your working color space) to another color profile with a different gamma, "
0272 "such as (i) the display profile used to display the image on the screen or "
0273 "(ii) perhaps to a new working space, or (iii) perhaps from your working "
0274 "space to your printer's color space."
0275 msgstr ""
0276 
0277 #: ../../color_management/working_space.rst:87
0278 msgid ""
0279 "Mathematically speaking, for a power transform you normalize the RGB numbers "
0280 "and raise the resulting numbers to an appropriate power depending on the "
0281 "respective gammas of the starting and ending color space, then re-normalize "
0282 "the results to a new set of RGB numbers. `Lcms <https://www.littlecms.com/"
0283 ">`_ does this for you when there is a need to convert from one color space "
0284 "to another in your workflow."
0285 msgstr ""
0286 
0287 #: ../../color_management/working_space.rst:89
0288 msgid ""
0289 "One practical consequence of the gamma of a working space is that the higher "
0290 "the gamma, the more tones are available for editing in the shadows, with "
0291 "consequently fewer tones available in the highlights. So theoretically, if "
0292 "you are working on a very dark-toned (low key) image you might want a "
0293 "working space with a higher gamma. And if you are working on a high key "
0294 "image, say a picture taken in full noon sunlight of a wedding dress with "
0295 "snow as a backdrop, you might want to choose a working space with a lower "
0296 "gamma, so you have more available tonal gradations in the highlights. But in "
0297 "the real world of real image editing, almost everyone uses working spaces "
0298 "with either gamma 1.8 or 2.2."
0299 msgstr ""
0300 
0301 #: ../../color_management/working_space.rst:91
0302 msgid ""
0303 "Some people are trying to standardize on gamma 2.0. sRGB and LStar-RGB are "
0304 "not gamma-based working spaces. Rather, sRGB uses a hybrid gamma, and LStar-"
0305 "RGB uses a luminosity-based tonal response curve instead of a gamma value."
0306 msgstr ""
0307 
0308 #: ../../color_management/working_space.rst:93
0309 msgid ""
0310 "In addition to gamma 1.8 and gamma 2.2 the only other gamma for a working "
0311 "space that gets much mention or use is gamma 1.0, also called linear gamma. "
0312 "Linear gamma is used in HDR (high dynamic range) imaging and also if one "
0313 "wants to avoid introducing gamma-induced errors into one's regular low "
0314 "dynamic range editing. Gamma-induced errors is a topic outside the scope of "
0315 "this manual, but see Gamma errors in picture scaling, for gamma-induced "
0316 "color shifts."
0317 msgstr ""
0318 
0319 #: ../../color_management/working_space.rst:95
0320 msgid ""
0321 "Unfortunately and despite their undeniable mathematical advantages, linear "
0322 "gamma working spaces have so few tones in the shadows that they are "
0323 "impossible to use for editing if one is working in 8-bits, and still "
0324 "problematic at 16-bits. When the day comes when we are all doing our editing "
0325 "on 32-bit files produced by our HDR cameras on our personal supercomputers, "
0326 "we predict that we will all be using working spaces with gamma 1."
0327 msgstr ""
0328 
0329 #: ../../color_management/working_space.rst:101
0330 msgid ""
0331 "Depending of the Settings digiKam Can Ask you to Convert to Working Space "
0332 "When Loading in Image Editor"
0333 msgstr ""
0334 
0335 #: ../../color_management/working_space.rst:104
0336 msgid "Large or Small Gamut"
0337 msgstr ""
0338 
0339 #: ../../color_management/working_space.rst:106
0340 msgid ""
0341 "One major consideration in choosing a working space is that some working "
0342 "spaces are bigger than others, meaning they cover more of the visible "
0343 "spectrum (and perhaps even include some imaginary colors - mathematical "
0344 "constructs that don't really exist). These bigger spaces offer the advantage "
0345 "of allowing you to keep all the colors captured by your camera and preserved "
0346 "by the Lcms conversion from your camera profile to the really big profile "
0347 "connection space."
0348 msgstr ""
0349 
0350 #: ../../color_management/working_space.rst:112
0351 msgid ""
0352 "For the Left to Right: sRGB, AbodeRGB, WideGammutRGB, and ProPhotoRGB Color "
0353 "Profile Show in digiKam"
0354 msgstr ""
0355 
0356 #: ../../color_management/working_space.rst:114
0357 msgid ""
0358 "But keeping all the possible colors comes at a price. It seems that any "
0359 "given digital image (pictures of daffodils with saturated yellows being one "
0360 "common exception) likely only contains a small subset of all the possible "
0361 "visible colors that your camera is capable of capturing. This small subset "
0362 "is easily contained in one of the smaller working spaces. Using a very large "
0363 "working space mean that editing your image (applying curves, saturation, "
0364 "etc.) can easily produce colors that your eventual output device (printer, "
0365 "monitor) simply cannot display."
0366 msgstr ""
0367 
0368 #: ../../color_management/working_space.rst:116
0369 msgid ""
0370 "So the conversion from your working space to your output device space (say "
0371 "your printer) will have to remap the out of gamut colors in your edited "
0372 "image, some of which might even be totally imaginary, to your printer color "
0373 "space with its much smaller gamut, leading to inaccurate colors at best and "
0374 "at worst to banding (posterization - gaps in what should be a smooth color "
0375 "transition, say, across an expanse of blue sky) and clipping (your carefully "
0376 "crafted muted transitions across delicate shades of red, for example, might "
0377 "get remapped to a solid block of dull red after conversion to your printer's "
0378 "color space)."
0379 msgstr ""
0380 
0381 #: ../../color_management/working_space.rst:118
0382 msgid ""
0383 "In other words, large gamut working spaces, improperly handled, can lead to "
0384 "lost information on output. Small gamut working spaces can clip information "
0385 "on input. Here is some oft-repeated advice:"
0386 msgstr ""
0387 
0388 #: ../../color_management/working_space.rst:120
0389 msgid "For images intended for the web, use sRGB."
0390 msgstr ""
0391 
0392 #: ../../color_management/working_space.rst:122
0393 msgid ""
0394 "For the most accuracy in your image editing (that is, making the most of "
0395 "your *bits* with the least risk of banding or clipping when you convert your "
0396 "image from your working space to an output space), use the smallest working "
0397 "space that includes all the colors in the scene that you photographed, plus "
0398 "a little extra room for those new colors you intentionally produce as you "
0399 "edit."
0400 msgstr ""
0401 
0402 #: ../../color_management/working_space.rst:124
0403 msgid ""
0404 "If you are working in 8-bits rather than 16-bits, choose a smaller space "
0405 "rather than a larger space."
0406 msgstr ""
0407 
0408 #: ../../color_management/working_space.rst:126
0409 msgid ""
0410 "For archival purposes, convert your RAW file to a 16-bit TIFF with a large "
0411 "gamut working space to avoid loosing color information. Then convert this "
0412 "archival TIFF to your working space of choice (saving the converted working "
0413 "TIFF under a new name, of course). See here for more details."
0414 msgstr ""
0415 
0416 #: ../../color_management/working_space.rst:132
0417 msgid "digiKam Queue Manager Allows to Batch Convert Color Space"
0418 msgstr ""
0419 
0420 #: ../../color_management/working_space.rst:135
0421 msgid "Gamma Properties"
0422 msgstr ""
0423 
0424 #: ../../color_management/working_space.rst:137
0425 msgid ""
0426 "The gamma of a color profile dictates what power transform needs to take "
0427 "place to properly convert from an image's embedded color profile (perhaps "
0428 "your working color space or your camera color profile) to another color "
0429 "profile with a different gamma, such as your chosen working space, or the "
0430 "display profile used to display the image on the screen or perhaps from one "
0431 "working space to another, or perhaps from your working space to your "
0432 "printer's color space. `Libraw <https://www.libraw.org/>`_ outputs a 16-bit "
0433 "image with a linear gamma, which means that a histogram of the resulting "
0434 "image file shows the actual amount of light that each pixel on the camera "
0435 "sensor captured during the exposure (paraphrasing this page). (Which is why "
0436 "at present applying a camera profile to the Libraw output also requires "
0437 "applying an appropriate gamma transform to get to the desired working space, "
0438 "unless the camera profile also uses gamma=1.)"
0439 msgstr ""
0440 
0441 #: ../../color_management/working_space.rst:139
0442 msgid ""
0443 "One practical consequence of the gamma of a working space is that the higher "
0444 "the gamma, the more discrete tones are available for editing in the shadows, "
0445 "with consequently fewer tones available in the highlights. Changing the "
0446 "gamma of an image redistributes the number of tones available in the lighter "
0447 "and darker areas of an image. Theoretically, if you are working on a very "
0448 "dark-toned (low key) image you might want a working space with a higher "
0449 "gamma. And if you are working on a high key image, say a picture taken in "
0450 "full noon sunlight of a wedding dress with snow as a backdrop, you might "
0451 "want to choose a working space with a lower gamma, so you have more "
0452 "available tonal gradations in the highlights."
0453 msgstr ""
0454 
0455 #: ../../color_management/working_space.rst:141
0456 msgid ""
0457 "Theory aside, in the real world of real image editing, almost everyone uses "
0458 "working spaces with either a gamma of either 1.8 or 2.2. sRGB and L*-RGB are "
0459 "two notable exceptions."
0460 msgstr ""
0461 
0462 #: ../../color_management/working_space.rst:143
0463 msgid ""
0464 "sRGB uses a transfer function close to that of a CRT (and thus not "
0465 "necessarily relevant to image editing or to display on an LCD). Unlike most "
0466 "other RGB color spaces the sRGB gamma can not be expressed as a single "
0467 "numerical value. The overall gamma is approximately 2.2, consisting of a "
0468 "linear (gamma 1.0) section near black, and a non-linear section elsewhere "
0469 "involving a 2.4 exponent and a gamma (slope of log output versus log input) "
0470 "changing from 1.0 through about 2.3, which makes for some complicated math "
0471 "during image processing."
0472 msgstr ""
0473 
0474 #: ../../color_management/working_space.rst:145
0475 msgid ""
0476 "L*-RGB uses as its transfer function the same perceptually uniform transfer "
0477 "function as the CIELab color space. *When storing colors in limited "
0478 "precision values* using a perceptually uniform transfer function *can "
0479 "improve the reproduction of tones*."
0480 msgstr ""
0481 
0482 #: ../../color_management/working_space.rst:147
0483 msgid ""
0484 "In addition to gamma=1.8 and gamma=2.2, the only other gamma for a working "
0485 "space that gets much mention or use is linear gamma, or gamma=1.0. As noted "
0486 "above, `Libraw <https://www.libraw.org/>`_ outputs linear gamma files if you "
0487 "ask for 16-bit output. Linear gamma is used in HDR (high dynamic range) "
0488 "imaging and also if one wants to avoid introducing gamma-induced errors into "
0489 "one's regular low dynamic range editing."
0490 msgstr ""
0491 
0492 #: ../../color_management/working_space.rst:149
0493 msgid ""
0494 "**Gamma-induced errors** is a topic outside the scope of this manual but "
0495 "it's commonly-encountered that gamma-induced error that is caused by "
0496 "incorrectly calculating luminance in a nonlinear RGB working space. And in a "
0497 "similar vein, the calculations involved in mixing colors together to produce "
0498 "new colors (such as using a digital filter to add warmth to an image) result "
0499 "in gamma errors unless the new colors are calculated by first transforming "
0500 "all the relevant values back to their linear values."
0501 msgstr ""
0502 
0503 #: ../../color_management/working_space.rst:151
0504 msgid ""
0505 "Unfortunately and despite their undeniable mathematical advantages, linear "
0506 "gamma working spaces have so few tones in the shadows that they are "
0507 "impossible to use for editing if one is working in 8-bit, and still "
0508 "problematic at 16-bit. When the day comes when we are all doing our editing "
0509 "on 32-bit files produced by our HDR cameras on our personal supercomputers, "
0510 "We can predict that we will all be using working spaces with gamma=1."
0511 msgstr ""
0512 
0513 #: ../../color_management/working_space.rst:154
0514 msgid "Tonal Steps and Gamut Size"
0515 msgstr ""
0516 
0517 #: ../../color_management/working_space.rst:156
0518 msgid ""
0519 "How many discrete tonal steps are there in a digital image? In an 8-bit "
0520 "image, you have 256 tonal steps from solid black to solid white. In a 16-bit "
0521 "image theoretically you have 65536 steps. But remember, those 16-bit started "
0522 "out as either 10-bit (=1024 steps), 12-bit (=4096 steps), or 14-bit (=16384 "
0523 "steps) as produced by the camera's A-to-D converter - the extra bits to "
0524 "reach 16-bit start out as just padding. The available tones are not "
0525 "distributed evenly from light to dark. In linear gamma mode (as the camera "
0526 "sensor sees things), there's a whole lot more tones in the highlights than "
0527 "in the shadows. Hence the advice, if you shoot RAW, to expose to the right "
0528 "but don't blow the highlights."
0529 msgstr ""
0530 
0531 #: ../../color_management/working_space.rst:158
0532 msgid ""
0533 "One major consideration in choosing a working space is that some working "
0534 "spaces are bigger than others, meaning they cover more of the visible "
0535 "spectrum (and as a consequence include some imaginary colors - mathematical "
0536 "constructs that don't really exist). These bigger spaces offer the advantage "
0537 "of allowing you to keep all the colors captured by your camera and preserved "
0538 "by the `Lcms <https://www.littlecms.com/>`_ conversion from your camera "
0539 "profile to the super-wide-gamut profile connection space and out again to "
0540 "your chosen working space."
0541 msgstr ""
0542 
0543 #: ../../color_management/working_space.rst:160
0544 msgid ""
0545 "But keeping all the possible colors comes at a price, as explained below. "
0546 "And it seems that any given digital image likely only contains a small "
0547 "subset of all the possible visible colors that your camera is capable of "
0548 "capturing. This small subset is easily contained in one of the smaller "
0549 "working spaces."
0550 msgstr ""
0551 
0552 #: ../../color_management/working_space.rst:162
0553 msgid ""
0554 "Using a very large working space means that editing your image (applying "
0555 "curves, increasing saturation, etc.) can easily produce colors that your "
0556 "eventual output device (printer, monitor) simply cannot reproduce (you "
0557 "cannot see these colors while you're editing, either). So the conversion "
0558 "from your working space to your output device space (say your printer) will "
0559 "have to remap the out-of-gamut colors in your edited image, some of which "
0560 "might even be totally imaginary, to your printer color space with its much "
0561 "smaller color gamut."
0562 msgstr ""
0563 
0564 #: ../../color_management/working_space.rst:164
0565 msgid ""
0566 "This remapping process will lead to inaccurate colors and loss of saturation "
0567 "at best. Even worse, the remapping can easily lead to banding (posterization "
0568 "- gaps in what should be a smooth color transition, across an expanse of "
0569 "blue sky) and clipping (e.g. your carefully crafted muted transitions across "
0570 "delicate shades of red, for example, might get remapped to a solid block of "
0571 "dull red after conversion to your printer's color space). Also, the experts "
0572 "say that 8-bit images just don't have enough tones to stretch across a wide "
0573 "gamut working space without banding and loss of saturation, even before "
0574 "conversion to an output space. So if you choose a large gamut working space, "
0575 "make sure you start with a 16-bit image."
0576 msgstr ""
0577 
0578 #: ../../color_management/working_space.rst:171
0579 msgid ""
0580 "The digiKam Color Profile Properties Dialog Displaying BestRGB Information"
0581 msgstr ""
0582 
0583 #: ../../color_management/working_space.rst:173
0584 msgid ""
0585 "To summarize, large gamut working spaces, improperly handled, can lead to "
0586 "lost information on output. Small gamut working spaces can clip information "
0587 "on input. Medium-sized gamut working spaces try to strike a happy medium."
0588 msgstr ""
0589 
0590 #: ../../color_management/working_space.rst:175
0591 msgid "Here are some oft-repeated bits of advice on choosing a working space:"
0592 msgstr ""
0593 
0594 #: ../../color_management/working_space.rst:177
0595 msgid ""
0596 "For images intended for the web, use (or at least convert the final image "
0597 "to) sRGB."
0598 msgstr ""
0599 
0600 #: ../../color_management/working_space.rst:179
0601 msgid ""
0602 "For the most accuracy in your image editing (that is, making the most of "
0603 "your limited *bits* with the least risk of banding or clipping when you "
0604 "convert your image from your working space to an output space), use the "
0605 "smallest working space that includes all the colors in the scene that you "
0606 "photographed, plus a little extra room for those new colors you "
0607 "intentionally produce as you edit."
0608 msgstr ""
0609 
0610 #: ../../color_management/working_space.rst:181
0611 msgid ""
0612 "If you are working in 8-bits rather than 16-bits, choose a smaller rather "
0613 "than a larger working space to avoid clipping and banding."
0614 msgstr ""
0615 
0616 #: ../../color_management/working_space.rst:183
0617 msgid ""
0618 "For archival purposes, convert your RAW file to a 16-bit TIFF with a large "
0619 "gamut working space to avoid loosing color information. Then convert this "
0620 "archival TIFF to your medium-gamut or large-gamut working space of choice "
0621 "(saving the converted working TIFF under a new name, of course)."
0622 msgstr ""