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0001 # Copyright (C) licensed under the  <a href="https://spdx.org/licenses/GFDL-1.2-or-later.html">licensed under the terms of the GNU Free Documentation License 1.2+</a> unless stated otherwise
0002 # This file is distributed under the same license as the Digikam Manual package.
0003 # Tommi Nieminen <translator@legisign.org>, 2023.
0004 #
0005 msgid ""
0006 msgstr ""
0007 "Project-Id-Version: Digikam Manual 8.1.0\n"
0008 "Report-Msgid-Bugs-To: \n"
0009 "POT-Creation-Date: 2023-12-02 00:35+0000\n"
0010 "PO-Revision-Date: 2023-05-10 17:38+0300\n"
0011 "Last-Translator: Tommi Nieminen <translator@legisign.org>\n"
0012 "Language-Team: Finnish <kde-i18n-doc@kde.org>\n"
0013 "Language: fi\n"
0014 "MIME-Version: 1.0\n"
0015 "Content-Type: text/plain; charset=UTF-8\n"
0016 "Content-Transfer-Encoding: 8bit\n"
0017 "Plural-Forms: nplurals=2; plural=(n != 1);\n"
0018 "X-Generator: Lokalize 23.04.0\n"
0019 
0020 #: ../../color_management/working_space.rst:1
0021 msgid "Color Management and Working Space"
0022 msgstr "Värinhallinta ja työtila"
0023 
0024 #: ../../color_management/working_space.rst:1
0025 msgid ""
0026 "digiKam, documentation, user manual, photo management, open source, free, "
0027 "learn, easy, image editor, color management, icc, profile, working space"
0028 msgstr ""
0029 
0030 #: ../../color_management/working_space.rst:14
0031 msgid "The Working Space"
0032 msgstr "Työavaruus"
0033 
0034 #: ../../color_management/working_space.rst:17
0035 msgid "Color Workflow"
0036 msgstr "Värityönkulku"
0037 
0038 #: ../../color_management/working_space.rst:19
0039 msgid ""
0040 "So we told digiKam where to find my monitor profile and we have a camera "
0041 "profile that we applied to the image file produced by my RAW processing "
0042 "software. What's the next step in color management?"
0043 msgstr ""
0044 "digiKamille on siis kerrottu, mistä löytää näyttöprofiili, ja RAW-"
0045 "käsittelyohjelman tuottamaan kuvatiedostoon on käytetty kameraprofiilia. "
0046 "Mikä on värinhallinnan seuraava vaihe?"
0047 
0048 #: ../../color_management/working_space.rst:21
0049 msgid ""
0050 "You need to choose a working color space so you can edit your image. `Lcms "
0051 "<https://www.littlecms.com/>`_ will transform your image from your camera "
0052 "color space to your chosen working space, via the **Profile Connection "
0053 "Space** specified by your camera color profile. Why cannot to just edit "
0054 "images in the color space described by the camera profile?"
0055 msgstr ""
0056 "Kuvan muokkaamista varten on valittava värityöavaruus. `LCMS <https://"
0057 "littlecms.com/>`_ muuntaa kuvan kameran väriavaruudesta valitsemaasi "
0058 "työavaruuteen kameran väriprofiilin osoittaman **profiilien yhteysavaruuden* "
0059 "kautta. Miksei kuvia siis voi muokata suoraan kameraprofiilin kuvaamassa "
0060 "väriavaruudessa?"
0061 
0062 #: ../../color_management/working_space.rst:23
0063 msgid ""
0064 "After all, the camera profile should provide the best *fit* to the colors "
0065 "recorded by my camera, as processed by my RAW processing procedure, right? "
0066 "Working spaces, such as sRGB or Adobe RGB, are color spaces that facilitate "
0067 "good results while editing. For instance, pixels with equal values of RGB "
0068 "should appear neutral. This just want means that for any given pixel in an "
0069 "image that has been converted to a suitable working space, if R=G=B you "
0070 "should see grey or black or white on your screen. Many camera profiles "
0071 "violate this *neutral* condition."
0072 msgstr ""
0073 "Kameraprofiilinhan tulisi kuvata paras *sovitus* kameran tallentamiin "
0074 "väreihin sellaisina kuin ne RAW-käsittely ne näkee, eikö? Työavaruudet kuten "
0075 "sRGB tai Adobe RGB ovat väriavaruuksia, jotka mahdollistavat hyvät "
0076 "muokkaustulokset. Kuvapisteiden, joiden RGB-arvot ovat samat, tulisi "
0077 "esimerkiksi näyttää neutraaleilta. Kuvan jokaisen työavaruuteen muunnetun "
0078 "kuvapiste, jossa punainen = vihreä = sininen arvo, tulisi siis näytölläsi "
0079 "näkyä harmaana, mustana tai valkoisena. Monet kameraprofiilit rikkovat tätä "
0080 "*neutraaliuden* ehtoa."
0081 
0082 #: ../../color_management/working_space.rst:29
0083 msgid ""
0084 "digiKam Image Editor has a Menu to Switch Quickly an Image from a Color "
0085 "Space to Another one"
0086 msgstr ""
0087 "digiKam-kuvamuokkaimessa on valikko, jolla vaihtaa nopeasti kuva "
0088 "väriavaruudesta toiseen"
0089 
0090 #: ../../color_management/working_space.rst:31
0091 msgid ""
0092 "However, there is one other good reason to not want to edit your image in "
0093 "your camera profile color space. If you look at the size of a typical camera "
0094 "profile, it is on the order of a quarter to a half a megabyte or more. It's "
0095 "got a lot of information about all the changes that need to be made at "
0096 "different regions of color and tonality in the original scene, to get "
0097 "accurate color rendition from the RGB values that come out of the RAW "
0098 "processor. The camera profile is accurate (at least for colors in the "
0099 "original target) but not particularly mathematically smooth. Working space "
0100 "color profiles, on the other hand, are very small in size (half a kilobyte "
0101 "instead of half a megabyte) because they describe a color gamut in terms of "
0102 "smooth, continuous mathematical functions. Working space profiles don't need "
0103 "to make allowances for the *messiness* of real world sensors, so the "
0104 "mathematical manipulations performed during image editing will go much more "
0105 "smoothly and accurately than if you try to edit your image while it is still "
0106 "in the camera color space."
0107 msgstr ""
0108 
0109 #: ../../color_management/working_space.rst:33
0110 msgid "Working Space Profiles are characterized by:"
0111 msgstr "Työavaruusprofiileja luonnehtivat:"
0112 
0113 #: ../../color_management/working_space.rst:35
0114 msgid ""
0115 "**Gamma** transfer function, which dictates how much the original linear "
0116 "intensity values captured by the camera sensor are altered to make editing "
0117 "easier or more precise. These values from the camera are subjected to the in-"
0118 "camera A-to-D conversion, then interpolated by the RAW processing program to "
0119 "produce the image file."
0120 msgstr ""
0121 
0122 #: ../../color_management/working_space.rst:37
0123 msgid ""
0124 "RGB primaries which dictate the range of colors, that is, the color "
0125 "**Gamut**, covered by a given profile."
0126 msgstr ""
0127 
0128 #: ../../color_management/working_space.rst:39
0129 msgid ""
0130 "**White point**, usually D50 or D65 though other values may be used, which "
0131 "specifies the white point color temperature of the working space."
0132 msgstr ""
0133 "**Valkopiste**, yleensä D50 tai D65, vaikka muitakin arvoja voi käyttää, "
0134 "joka määrittää työavaruuden valkoisen pisteen värilämpötilan."
0135 
0136 #: ../../color_management/working_space.rst:42
0137 msgid "Confusions Terminology"
0138 msgstr "Termiepäselvyyksiä"
0139 
0140 #: ../../color_management/working_space.rst:44
0141 msgid ""
0142 "Before talking more about working spaces, some confusions and confusing "
0143 "terminology needs to be cleared up:"
0144 msgstr ""
0145 "Ennen kuin työavaruuksista puhutaan lisää, on selvitettävä joitakin "
0146 "epäselvyyksiä ja harhaanjohtavia termejä:"
0147 
0148 #: ../../color_management/working_space.rst:46
0149 msgid ""
0150 "sRGB is both a working color space and an output color space for images "
0151 "intended for the web and for monitor display. If you have a spiffy new "
0152 "monitor with a gamut larger than the gamut covered by sRGB, obviously you "
0153 "might want to reconsider what output profile to use to best take advantage "
0154 "of your wonderful and hopefully calibrated and profiled monitor, but please "
0155 "convert your image to sRGB before sending it on to your friends. sRGB is "
0156 "also the color space that a lot of home and mass-production commercial "
0157 "printers expect image files to be in when sent to the printer. It is also "
0158 "the color space that most programs assume if an image does not have an "
0159 "embedded color profile telling the program what color space should be used "
0160 "to interpret (translate) the RGB numbers. So if you choose to not use color-"
0161 "management, your color-management choices are simple - set everything to "
0162 "sRGB."
0163 msgstr ""
0164 
0165 #: ../../color_management/working_space.rst:48
0166 msgid ""
0167 "All JPEGs coming straight out of a camera (even if produced by point-and-"
0168 "shoots cameras that don't allow you to save a RAW file) start life inside "
0169 "the camera as a RAW file produced by the camera's A to D converter. The "
0170 "processor inside the camera interpolates the RAW file, assigns a camera "
0171 "profile, translates the resulting RGB numbers to a working space (usually "
0172 "sRGB but sometimes you can choose AdobeRGB, depending on the camera), does "
0173 "the JPEG compression, and stores the JPEG file on your camera card. So JPEGs "
0174 "from your camera never need to be assigned a camera or input profile which "
0175 "is then translated to a working space via a Profile Connection Space. JPEGs "
0176 "from a camera are already in a working space."
0177 msgstr ""
0178 
0179 #: ../../color_management/working_space.rst:50
0180 msgid ""
0181 "In case anyone is unsure on this point, note that an interpolated RAW file "
0182 "is no longer a RAW file - it has been interpolated and then output as a TIFF "
0183 "whose RGB values need to be translated to a working space, using the camera "
0184 "profile, the Profile Connection Space, and Lcms."
0185 msgstr ""
0186 
0187 #: ../../color_management/working_space.rst:52
0188 msgid ""
0189 "To introduce a bit of commonly heard color-management terminology here - the "
0190 "camera profile and your printer's color profile are both device dependent, "
0191 "whereas the working space will be device-independent - it can be used with "
0192 "any image, with any properly color-managed software, without regard for "
0193 "where the image originated."
0194 msgstr ""
0195 
0196 #: ../../color_management/working_space.rst:54
0197 msgid ""
0198 "Above we have used the words translate and translation as a descriptive "
0199 "metaphor for what Lcms does when it translates RGB values from one color "
0200 "space to another via the Profile Connection Space. The usual and correct "
0201 "terminology is convert and conversion. The four methods of conversion from "
0202 "one color space to another are: perceptual, relative colorimetric, absolute "
0203 "colorimetric, and saturation. Which method of conversion you should use for "
0204 "any given image processing step from RAW file to final output image is "
0205 "beyond the scope of this manual. The standard advice is: when in doubt, use "
0206 "perceptual."
0207 msgstr ""
0208 
0209 #: ../../color_management/working_space.rst:56
0210 msgid ""
0211 "Assign a profile means change the meaning of the RGB numbers in an image by "
0212 "embedding a new profile without changing the actual RGB numbers associated "
0213 "with each pixel in the image; convert means embed a new profile, but also "
0214 "change the RGB numbers at the same time so that the meaning of the RGB "
0215 "values - that is, the real-world visible color represented by the trio of "
0216 "RGB numbers associated with each pixel in an image - remains the same before "
0217 "and after the conversion from one space to another. You should be able to do "
0218 "multiple conversions of an image from one working space to another, and with "
0219 "a properly color-managed image editor, even though all the RGB numbers in "
0220 "the image will change with each conversion, the image on your screen should "
0221 "look the same (leaving aside the usually unnoticeable small but inevitable "
0222 "changes from accumulated gamut mismatches and mathematical rounding errors). "
0223 "However, every time you assign a new working space profile rather than "
0224 "convert to a new working space, the appearance of the image should more or "
0225 "less drastically change."
0226 msgstr ""
0227 
0228 #: ../../color_management/working_space.rst:58
0229 msgid ""
0230 "Color management is not only relevant if you shoot RAW. Color management "
0231 "affects every stage of the image processing pipeline, whether you start with "
0232 "a RAW file that you, yourself interpolate and translate into a TIFF, or if "
0233 "you start with a JPEG or TIFF produced by your camera."
0234 msgstr ""
0235 
0236 #: ../../color_management/working_space.rst:61
0237 msgid "Selecting a Working Space"
0238 msgstr "Työavaruuden valinta"
0239 
0240 #: ../../color_management/working_space.rst:63
0241 msgid ""
0242 "Which working space do you need to use in digiKam? Working spaces, such as "
0243 "sRGB or Adobe RGB, are color spaces that facilitate good results while "
0244 "editing. For instance, pixels with equal values of RGB should appear "
0245 "neutral. Using a large gamut working space will lead to posterization, while "
0246 "using a small working space will lead to clipping. This trade-off is a "
0247 "consideration for the Image Editor."
0248 msgstr ""
0249 
0250 #: ../../color_management/working_space.rst:65
0251 msgid "Most working space profiles are characterized by:"
0252 msgstr "Useimpia työavaruusprofiileja luonnehtivat:"
0253 
0254 #: ../../color_management/working_space.rst:67
0255 msgid ""
0256 "The place of the gamut into the **Diagram** `(1)` of all colors visible to "
0257 "the average human eyes."
0258 msgstr ""
0259 
0260 #: ../../color_management/working_space.rst:69
0261 msgid ""
0262 "The **Gamut** `(2)` triangle to define the range of RGB colors of the "
0263 "profile. Red point is on the bottom right corner, Green is on the top, Blue "
0264 "is on the left bottom. Values given around the edge of the gamut passing "
0265 "from the blue, the green and the red points, are the spectral colors in "
0266 "nanometers."
0267 msgstr ""
0268 
0269 #: ../../color_management/working_space.rst:71
0270 msgid ""
0271 "The **White point** `(3)` to define the total dynamic range of the profile."
0272 msgstr ""
0273 
0274 #: ../../color_management/working_space.rst:73
0275 msgid ""
0276 "The **Gamma** to define the transfer function of the profile (not displayed "
0277 "in the gamut)."
0278 msgstr ""
0279 
0280 #: ../../color_management/working_space.rst:79
0281 msgid "The Color Profile Details of CIE Chromaticity Diagram Show in digiKam"
0282 msgstr ""
0283 
0284 #: ../../color_management/working_space.rst:81
0285 msgid ""
0286 "The practical consequences that result from using different RGB primaries, "
0287 "leading to larger or smaller working spaces, are discussed below. The "
0288 "practical consequences for different choices for the working space white "
0289 "point are beyond the scope of this manual. Here we will talk a little bit "
0290 "about the practical consequences of the working space gamma."
0291 msgstr ""
0292 
0293 #: ../../color_management/working_space.rst:83
0294 msgid ""
0295 "The gamma of a color profile dictates what power transform needs to take "
0296 "place to properly convert from an image's embedded color profile (perhaps "
0297 "your working color space) to another color profile with a different gamma, "
0298 "such as (i) the display profile used to display the image on the screen or "
0299 "(ii) perhaps to a new working space, or (iii) perhaps from your working "
0300 "space to your printer's color space."
0301 msgstr ""
0302 
0303 #: ../../color_management/working_space.rst:87
0304 msgid ""
0305 "Mathematically speaking, for a power transform you normalize the RGB numbers "
0306 "and raise the resulting numbers to an appropriate power depending on the "
0307 "respective gammas of the starting and ending color space, then re-normalize "
0308 "the results to a new set of RGB numbers. `Lcms <https://www.littlecms.com/"
0309 ">`_ does this for you when there is a need to convert from one color space "
0310 "to another in your workflow."
0311 msgstr ""
0312 
0313 #: ../../color_management/working_space.rst:89
0314 msgid ""
0315 "One practical consequence of the gamma of a working space is that the higher "
0316 "the gamma, the more tones are available for editing in the shadows, with "
0317 "consequently fewer tones available in the highlights. So theoretically, if "
0318 "you are working on a very dark-toned (low key) image you might want a "
0319 "working space with a higher gamma. And if you are working on a high key "
0320 "image, say a picture taken in full noon sunlight of a wedding dress with "
0321 "snow as a backdrop, you might want to choose a working space with a lower "
0322 "gamma, so you have more available tonal gradations in the highlights. But in "
0323 "the real world of real image editing, almost everyone uses working spaces "
0324 "with either gamma 1.8 or 2.2."
0325 msgstr ""
0326 
0327 #: ../../color_management/working_space.rst:91
0328 msgid ""
0329 "Some people are trying to standardize on gamma 2.0. sRGB and LStar-RGB are "
0330 "not gamma-based working spaces. Rather, sRGB uses a hybrid gamma, and LStar-"
0331 "RGB uses a luminosity-based tonal response curve instead of a gamma value."
0332 msgstr ""
0333 
0334 #: ../../color_management/working_space.rst:93
0335 msgid ""
0336 "In addition to gamma 1.8 and gamma 2.2 the only other gamma for a working "
0337 "space that gets much mention or use is gamma 1.0, also called linear gamma. "
0338 "Linear gamma is used in HDR (high dynamic range) imaging and also if one "
0339 "wants to avoid introducing gamma-induced errors into one's regular low "
0340 "dynamic range editing. Gamma-induced errors is a topic outside the scope of "
0341 "this manual, but see Gamma errors in picture scaling, for gamma-induced "
0342 "color shifts."
0343 msgstr ""
0344 
0345 #: ../../color_management/working_space.rst:95
0346 msgid ""
0347 "Unfortunately and despite their undeniable mathematical advantages, linear "
0348 "gamma working spaces have so few tones in the shadows that they are "
0349 "impossible to use for editing if one is working in 8-bits, and still "
0350 "problematic at 16-bits. When the day comes when we are all doing our editing "
0351 "on 32-bit files produced by our HDR cameras on our personal supercomputers, "
0352 "we predict that we will all be using working spaces with gamma 1."
0353 msgstr ""
0354 
0355 #: ../../color_management/working_space.rst:101
0356 msgid ""
0357 "Depending of the Settings digiKam Can Ask you to Convert to Working Space "
0358 "When Loading in Image Editor"
0359 msgstr ""
0360 
0361 #: ../../color_management/working_space.rst:104
0362 msgid "Large or Small Gamut"
0363 msgstr ""
0364 
0365 #: ../../color_management/working_space.rst:106
0366 msgid ""
0367 "One major consideration in choosing a working space is that some working "
0368 "spaces are bigger than others, meaning they cover more of the visible "
0369 "spectrum (and perhaps even include some imaginary colors - mathematical "
0370 "constructs that don't really exist). These bigger spaces offer the advantage "
0371 "of allowing you to keep all the colors captured by your camera and preserved "
0372 "by the Lcms conversion from your camera profile to the really big profile "
0373 "connection space."
0374 msgstr ""
0375 
0376 #: ../../color_management/working_space.rst:112
0377 msgid ""
0378 "For the Left to Right: sRGB, AbodeRGB, WideGammutRGB, and ProPhotoRGB Color "
0379 "Profile Show in digiKam"
0380 msgstr ""
0381 
0382 #: ../../color_management/working_space.rst:114
0383 msgid ""
0384 "But keeping all the possible colors comes at a price. It seems that any "
0385 "given digital image (pictures of daffodils with saturated yellows being one "
0386 "common exception) likely only contains a small subset of all the possible "
0387 "visible colors that your camera is capable of capturing. This small subset "
0388 "is easily contained in one of the smaller working spaces. Using a very large "
0389 "working space mean that editing your image (applying curves, saturation, "
0390 "etc.) can easily produce colors that your eventual output device (printer, "
0391 "monitor) simply cannot display."
0392 msgstr ""
0393 
0394 #: ../../color_management/working_space.rst:116
0395 msgid ""
0396 "So the conversion from your working space to your output device space (say "
0397 "your printer) will have to remap the out of gamut colors in your edited "
0398 "image, some of which might even be totally imaginary, to your printer color "
0399 "space with its much smaller gamut, leading to inaccurate colors at best and "
0400 "at worst to banding (posterization - gaps in what should be a smooth color "
0401 "transition, say, across an expanse of blue sky) and clipping (your carefully "
0402 "crafted muted transitions across delicate shades of red, for example, might "
0403 "get remapped to a solid block of dull red after conversion to your printer's "
0404 "color space)."
0405 msgstr ""
0406 
0407 #: ../../color_management/working_space.rst:118
0408 msgid ""
0409 "In other words, large gamut working spaces, improperly handled, can lead to "
0410 "lost information on output. Small gamut working spaces can clip information "
0411 "on input. Here is some oft-repeated advice:"
0412 msgstr ""
0413 
0414 #: ../../color_management/working_space.rst:120
0415 msgid "For images intended for the web, use sRGB."
0416 msgstr ""
0417 
0418 #: ../../color_management/working_space.rst:122
0419 msgid ""
0420 "For the most accuracy in your image editing (that is, making the most of "
0421 "your *bits* with the least risk of banding or clipping when you convert your "
0422 "image from your working space to an output space), use the smallest working "
0423 "space that includes all the colors in the scene that you photographed, plus "
0424 "a little extra room for those new colors you intentionally produce as you "
0425 "edit."
0426 msgstr ""
0427 
0428 #: ../../color_management/working_space.rst:124
0429 msgid ""
0430 "If you are working in 8-bits rather than 16-bits, choose a smaller space "
0431 "rather than a larger space."
0432 msgstr ""
0433 
0434 #: ../../color_management/working_space.rst:126
0435 msgid ""
0436 "For archival purposes, convert your RAW file to a 16-bit TIFF with a large "
0437 "gamut working space to avoid loosing color information. Then convert this "
0438 "archival TIFF to your working space of choice (saving the converted working "
0439 "TIFF under a new name, of course). See here for more details."
0440 msgstr ""
0441 
0442 #: ../../color_management/working_space.rst:132
0443 msgid "digiKam Queue Manager Allows to Batch Convert Color Space"
0444 msgstr "digiKamin jononhallinta sallii väriavaruuden muuntamisen eräajona"
0445 
0446 #: ../../color_management/working_space.rst:135
0447 msgid "Gamma Properties"
0448 msgstr "Gammaominaisuudet"
0449 
0450 #: ../../color_management/working_space.rst:137
0451 msgid ""
0452 "The gamma of a color profile dictates what power transform needs to take "
0453 "place to properly convert from an image's embedded color profile (perhaps "
0454 "your working color space or your camera color profile) to another color "
0455 "profile with a different gamma, such as your chosen working space, or the "
0456 "display profile used to display the image on the screen or perhaps from one "
0457 "working space to another, or perhaps from your working space to your "
0458 "printer's color space. `Libraw <https://www.libraw.org/>`_ outputs a 16-bit "
0459 "image with a linear gamma, which means that a histogram of the resulting "
0460 "image file shows the actual amount of light that each pixel on the camera "
0461 "sensor captured during the exposure (paraphrasing this page). (Which is why "
0462 "at present applying a camera profile to the Libraw output also requires "
0463 "applying an appropriate gamma transform to get to the desired working space, "
0464 "unless the camera profile also uses gamma=1.)"
0465 msgstr ""
0466 
0467 #: ../../color_management/working_space.rst:139
0468 msgid ""
0469 "One practical consequence of the gamma of a working space is that the higher "
0470 "the gamma, the more discrete tones are available for editing in the shadows, "
0471 "with consequently fewer tones available in the highlights. Changing the "
0472 "gamma of an image redistributes the number of tones available in the lighter "
0473 "and darker areas of an image. Theoretically, if you are working on a very "
0474 "dark-toned (low key) image you might want a working space with a higher "
0475 "gamma. And if you are working on a high key image, say a picture taken in "
0476 "full noon sunlight of a wedding dress with snow as a backdrop, you might "
0477 "want to choose a working space with a lower gamma, so you have more "
0478 "available tonal gradations in the highlights."
0479 msgstr ""
0480 
0481 #: ../../color_management/working_space.rst:141
0482 msgid ""
0483 "Theory aside, in the real world of real image editing, almost everyone uses "
0484 "working spaces with either a gamma of either 1.8 or 2.2. sRGB and L*-RGB are "
0485 "two notable exceptions."
0486 msgstr ""
0487 
0488 #: ../../color_management/working_space.rst:143
0489 msgid ""
0490 "sRGB uses a transfer function close to that of a CRT (and thus not "
0491 "necessarily relevant to image editing or to display on an LCD). Unlike most "
0492 "other RGB color spaces the sRGB gamma can not be expressed as a single "
0493 "numerical value. The overall gamma is approximately 2.2, consisting of a "
0494 "linear (gamma 1.0) section near black, and a non-linear section elsewhere "
0495 "involving a 2.4 exponent and a gamma (slope of log output versus log input) "
0496 "changing from 1.0 through about 2.3, which makes for some complicated math "
0497 "during image processing."
0498 msgstr ""
0499 
0500 #: ../../color_management/working_space.rst:145
0501 msgid ""
0502 "L*-RGB uses as its transfer function the same perceptually uniform transfer "
0503 "function as the CIELab color space. *When storing colors in limited "
0504 "precision values* using a perceptually uniform transfer function *can "
0505 "improve the reproduction of tones*."
0506 msgstr ""
0507 
0508 #: ../../color_management/working_space.rst:147
0509 msgid ""
0510 "In addition to gamma=1.8 and gamma=2.2, the only other gamma for a working "
0511 "space that gets much mention or use is linear gamma, or gamma=1.0. As noted "
0512 "above, `Libraw <https://www.libraw.org/>`_ outputs linear gamma files if you "
0513 "ask for 16-bit output. Linear gamma is used in HDR (high dynamic range) "
0514 "imaging and also if one wants to avoid introducing gamma-induced errors into "
0515 "one's regular low dynamic range editing."
0516 msgstr ""
0517 
0518 #: ../../color_management/working_space.rst:149
0519 msgid ""
0520 "**Gamma-induced errors** is a topic outside the scope of this manual but "
0521 "it's commonly-encountered that gamma-induced error that is caused by "
0522 "incorrectly calculating luminance in a nonlinear RGB working space. And in a "
0523 "similar vein, the calculations involved in mixing colors together to produce "
0524 "new colors (such as using a digital filter to add warmth to an image) result "
0525 "in gamma errors unless the new colors are calculated by first transforming "
0526 "all the relevant values back to their linear values."
0527 msgstr ""
0528 
0529 #: ../../color_management/working_space.rst:151
0530 msgid ""
0531 "Unfortunately and despite their undeniable mathematical advantages, linear "
0532 "gamma working spaces have so few tones in the shadows that they are "
0533 "impossible to use for editing if one is working in 8-bit, and still "
0534 "problematic at 16-bit. When the day comes when we are all doing our editing "
0535 "on 32-bit files produced by our HDR cameras on our personal supercomputers, "
0536 "We can predict that we will all be using working spaces with gamma=1."
0537 msgstr ""
0538 
0539 #: ../../color_management/working_space.rst:154
0540 msgid "Tonal Steps and Gamut Size"
0541 msgstr ""
0542 
0543 #: ../../color_management/working_space.rst:156
0544 msgid ""
0545 "How many discrete tonal steps are there in a digital image? In an 8-bit "
0546 "image, you have 256 tonal steps from solid black to solid white. In a 16-bit "
0547 "image theoretically you have 65536 steps. But remember, those 16-bit started "
0548 "out as either 10-bit (=1024 steps), 12-bit (=4096 steps), or 14-bit (=16384 "
0549 "steps) as produced by the camera's A-to-D converter - the extra bits to "
0550 "reach 16-bit start out as just padding. The available tones are not "
0551 "distributed evenly from light to dark. In linear gamma mode (as the camera "
0552 "sensor sees things), there's a whole lot more tones in the highlights than "
0553 "in the shadows. Hence the advice, if you shoot RAW, to expose to the right "
0554 "but don't blow the highlights."
0555 msgstr ""
0556 
0557 #: ../../color_management/working_space.rst:158
0558 msgid ""
0559 "One major consideration in choosing a working space is that some working "
0560 "spaces are bigger than others, meaning they cover more of the visible "
0561 "spectrum (and as a consequence include some imaginary colors - mathematical "
0562 "constructs that don't really exist). These bigger spaces offer the advantage "
0563 "of allowing you to keep all the colors captured by your camera and preserved "
0564 "by the `Lcms <https://www.littlecms.com/>`_ conversion from your camera "
0565 "profile to the super-wide-gamut profile connection space and out again to "
0566 "your chosen working space."
0567 msgstr ""
0568 
0569 #: ../../color_management/working_space.rst:160
0570 msgid ""
0571 "But keeping all the possible colors comes at a price, as explained below. "
0572 "And it seems that any given digital image likely only contains a small "
0573 "subset of all the possible visible colors that your camera is capable of "
0574 "capturing. This small subset is easily contained in one of the smaller "
0575 "working spaces."
0576 msgstr ""
0577 
0578 #: ../../color_management/working_space.rst:162
0579 msgid ""
0580 "Using a very large working space means that editing your image (applying "
0581 "curves, increasing saturation, etc.) can easily produce colors that your "
0582 "eventual output device (printer, monitor) simply cannot reproduce (you "
0583 "cannot see these colors while you're editing, either). So the conversion "
0584 "from your working space to your output device space (say your printer) will "
0585 "have to remap the out-of-gamut colors in your edited image, some of which "
0586 "might even be totally imaginary, to your printer color space with its much "
0587 "smaller color gamut."
0588 msgstr ""
0589 
0590 #: ../../color_management/working_space.rst:164
0591 msgid ""
0592 "This remapping process will lead to inaccurate colors and loss of saturation "
0593 "at best. Even worse, the remapping can easily lead to banding (posterization "
0594 "- gaps in what should be a smooth color transition, across an expanse of "
0595 "blue sky) and clipping (e.g. your carefully crafted muted transitions across "
0596 "delicate shades of red, for example, might get remapped to a solid block of "
0597 "dull red after conversion to your printer's color space). Also, the experts "
0598 "say that 8-bit images just don't have enough tones to stretch across a wide "
0599 "gamut working space without banding and loss of saturation, even before "
0600 "conversion to an output space. So if you choose a large gamut working space, "
0601 "make sure you start with a 16-bit image."
0602 msgstr ""
0603 
0604 #: ../../color_management/working_space.rst:171
0605 msgid ""
0606 "The digiKam Color Profile Properties Dialog Displaying BestRGB Information"
0607 msgstr ""
0608 
0609 #: ../../color_management/working_space.rst:173
0610 msgid ""
0611 "To summarize, large gamut working spaces, improperly handled, can lead to "
0612 "lost information on output. Small gamut working spaces can clip information "
0613 "on input. Medium-sized gamut working spaces try to strike a happy medium."
0614 msgstr ""
0615 
0616 #: ../../color_management/working_space.rst:175
0617 msgid "Here are some oft-repeated bits of advice on choosing a working space:"
0618 msgstr ""
0619 
0620 #: ../../color_management/working_space.rst:177
0621 msgid ""
0622 "For images intended for the web, use (or at least convert the final image "
0623 "to) sRGB."
0624 msgstr ""
0625 
0626 #: ../../color_management/working_space.rst:179
0627 msgid ""
0628 "For the most accuracy in your image editing (that is, making the most of "
0629 "your limited *bits* with the least risk of banding or clipping when you "
0630 "convert your image from your working space to an output space), use the "
0631 "smallest working space that includes all the colors in the scene that you "
0632 "photographed, plus a little extra room for those new colors you "
0633 "intentionally produce as you edit."
0634 msgstr ""
0635 
0636 #: ../../color_management/working_space.rst:181
0637 msgid ""
0638 "If you are working in 8-bits rather than 16-bits, choose a smaller rather "
0639 "than a larger working space to avoid clipping and banding."
0640 msgstr ""
0641 
0642 #: ../../color_management/working_space.rst:183
0643 msgid ""
0644 "For archival purposes, convert your RAW file to a 16-bit TIFF with a large "
0645 "gamut working space to avoid loosing color information. Then convert this "
0646 "archival TIFF to your medium-gamut or large-gamut working space of choice "
0647 "(saving the converted working TIFF under a new name, of course)."
0648 msgstr ""