From c07d0c2d2f6f7b0eb6e92cc6204bf05037957e82 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?J=C3=B6rg=20Frings-F=C3=BCrst?= Date: Mon, 1 Sep 2014 15:43:52 +0200 Subject: Imported Upstream version 1.6.3 --- doc/tiffgamut.html | 348 +++++++++++++++++++++++++---------------------------- 1 file changed, 163 insertions(+), 185 deletions(-) (limited to 'doc/tiffgamut.html') diff --git a/doc/tiffgamut.html b/doc/tiffgamut.html index bc63ce7..5b67603 100644 --- a/doc/tiffgamut.html +++ b/doc/tiffgamut.html @@ -9,182 +9,195 @@

xicc/tiffgamut

Summary

- Create a gamut file or VRML file of the color gamut of the - contents of a set of TIFF or JPEG image.
+ Create a gamut file or VRML file of the color gamut of the contents + of a set of TIFF or JPEG image.

tiffgamut allows creation of - gamut files from the pixel values in a - set of TIFF and/or JPEG raster images, as defined by an ICC profile, - in L*a*b* or - CIECAM02 - Jab - colorspace, and can also represent the gamut as a VRML file. This - can be used for visualizing and comparing the gamut of an image to - the - colorspace it is - in, or a colorspace it might get transformed into, and can also be - used - to create an image source gamut for use with - collink.
+ gamut files from the pixel values in a set of TIFF and/or JPEG + raster images, as defined by an ICC profile, in L*a*b* or CIECAM02 + Jab colorspace, and can also represent the gamut as a VRML file. + This can be used for visualizing and comparing the gamut of an image + to the colorspace it is in, or a colorspace it might get transformed + into, and can also be used to create an image source gamut for use + with collink.

NOTE that if you are - creating - an image gamut suitable for use with the collink - -g or -G - flags, or colprof - -g, use the Jab appearance space intent for appearance space - gamut - mappings, and the same input viewing - conditions to be used in collink - or colprof - using - the -c flag, i.e. "tiffgamut -pj -cmt sRGB.icm image.tif"
+ creating an image gamut suitable for use with the collink -g + or -G flags, or colprof -g, use the Jab appearance space + intent for appearance space gamut mappings, and the same input + viewing conditions to be used in collink + or colprof using the -c + flag, i.e. "tiffgamut -pj -cmt sRGB.icm image.tif"

Usage Summary

tiffgamut [-v level] [profile.icm | embedded.tif/jpg] infile1.tif/jpg [infile2.tif/jpg ...]
-v            + + Verbose
- - -d - sres       Surface - resolution details 1.0 - 50.0
+ -d + sres       Surface resolution + details 1.0 - 50.0
-w            emit + + VRML .wrl file as well as CGATS .gam file
-n            Don't + + add VRML axes or white/black point
-k            Add + + markers for prim. & sec. "cusp" points
-f perc       Filter by - popularity, - perc = percent to use
+ popularity, perc = percent to use
-i - intent     p = - perceptual, r = relative colorimetric,
+ intent     p = perceptual, r = relative + colorimetric,
               s + + = saturation, a = absolute (default), d = profile default
-o - order      n = normal - (priority: lut > matrix > monochrome)
+ order      n = normal (priority: lut + > matrix > monochrome)
               r - = reverse (priority: monochrome > - matrix > lut)
+ + + = reverse (priority: monochrome > matrix > lut)
-p oride      l - = - Lab_PCS (default), j = CIECAM02 Appearance Jab

-c viewcond   - set - appearance mode and viewing conditions for CIECAM02,

               either + + an enumerated choice, or a parameter:value change
-    pp - Practical Reflection - Print - (ISO-3664 P2)
+ style="font-family: monospace;"> +    pp - Practical Reflection Print (ISO-3664 P2)
           + + pe - Print evaluation environment (CIE 116-1995)
           + + pc - Critical print evaluation environment (ISO-3664 P1)
-    - mt - Monitor in typical work environment
   + mt - Monitor in typical work environment
       + + mb - Monitor in bright work environment
     - -     md - Monitor in darkened work +     md - Monitor in darkened work environment
     - -     jm - Projector in dim environment

     - -     jd - Projector in dark environment

      -     pcd - Photo CD - original scene - outdoors
+     pcd - Photo CD - original scene outdoors
     - -     ob - Original scene - Bright Outdoors

     - -     cx - Cut Sheet Transparencies on a viewing - box
+     cx - Cut Sheet Transparencies on a + viewing box
         s:surround   + + n = auto, a = average, m = dim, d = dark,
               + +    c = transparency (default average)
         w:X:Y:Z      - Adapted white point - as XYZ (default media white)
+ + + Adapted white point as XYZ (default media white)
         w:x:y        - Adapted white point as - x, y
+ + + Adapted white point as x, y
         a:adaptation - Adaptation luminance in - cd.m^2 - (default 50.0)
+ + + Adaptation luminance in cd.m^2 (default 50.0)
         b:background + + Background % of image luminance (default 20)
-          l:scenewhite Scene - white in - cd.m^2 if surround = auto (default 250)
-          +          l:imagewhite Image + white in cd.m^2 if surround = auto (default 250)
+          f:flare      - Flare - light % of image luminance (default 1)
+ + + Flare light % of image luminance (default 1)
+          + g:glare      Glare light % of ambient + (default 1)
    -    - f:X:Y:Z      Flare color as - XYZ (default media white)
         -f:x:y        - Flare color as x, y
+ + g:x:y        Glare color as + x, y
-O outputfile Override the default output filename & extension.

@@ -193,148 +206,116 @@ f:x:y        The -v flag dumps out the ICC profile header information.

The -d parameter controls the level of detail displayed in - the - surface. The parameter roughly corresponds to a deltaE value, so - smaller - values - give greater detail. The default value is around 10, and is a good - place - to start. Small values may take a lot of time to generate, and will - produce - big files.
+ the surface. The parameter roughly corresponds to a deltaE value, so + smaller values give greater detail. The default value is around 10, + and is a good place to start. Small values may take a lot of time to + generate, and will produce big files.

The -w flag causes a VRML file to be produced, as well as a gamut file.

- The -n flag suppresses the L*a*b* axes being created in - the + The -n flag suppresses the L*a*b* axes being created in the VRML.

The -k flag adds markers - for - each of the primary and secondary "cusp" points (Red, Yellow, Green, - Cyan, Blue & Magenta). No markers will be displayed if the cusps - cannot be determined.
+ for each of the primary and secondary "cusp" points (Red, Yellow, + Green, Cyan, Blue & Magenta). No markers will be displayed if + the cusps cannot be determined.

The -f perc parameter turns on - filtering of - the raster colors. The colors from the image are clustered, and then - sorted according to popularity, and then the perc most common percentage of colors are used to create the gamut surface. This may be useful in creating a source gamut mapping surface that favors the important colors within an image, and doesn't attempt to compress the color reproduction in order to reproduce the little used colors. A value of perc of 90 or 80 may be - a good place - to start. Note that the filtering is performed independently on each - raster image processed, with the final gamut being the union of all - the - filtered image gamuts.
+ a good place to start. Note that the filtering is performed + independently on each raster image processed, with the final gamut + being the union of all the filtered image gamuts.

The -i flag selects the intent transform used for a lut - based - profile. It also selects between relative and absolute colorimetric - for - non-lut base profiles. Note that anything other than colorimetric - may - not represent the - native capabilities of the device. The default intent will be - absolute - colorimetic for L*a*b* output, and CIECAM02 appearance for Jab - output.
+ based profile. It also selects between relative and absolute + colorimetric for non-lut base profiles. Note that anything other + than colorimetric may not represent the native capabilities of the + device. The default intent will be absolute colorimetic for L*a*b* + output, and CIECAM02 appearance for Jab output.

An ICC profile is allowed to contain more than the minimum number of elements or table needed to describe a certain transform, and may contain redundant descriptions. By default, LUT based table information will be used first if present, followed by matrix/shaper - information, and only using monochrome - information if it is all that is present. The -o flag, - reverses - this + information, and only using monochrome information if it is all that + is present. The -o flag, reverses this order.

-p: By default the gamut - will - be created in L*a*b* colorspace. If -pj is selected, then CIECAM02 + will be created in L*a*b* colorspace. If -pj is selected, then CIECAM02 appearance space Jab will be used for the output, and the viewing conditions will be taken into account. Jab space is what is normally needed to be compatible with the default intents used in colprof.
Note that the CIECAM02 output space selection by default uses the colorimetric transform of the profile resulting in the - appearance - of the native device, but that the perceptual or + appearance of the native device, but that the perceptual or saturation transforms may be used by selecting them using the -i parameter, which may give a different result with some profiles. This may be desirable if an - image - is to be transformed through the perceptual or saturation tables of - a - profile as part of a link with an Argyll generated output profile, - since it will then represent the apparent gamut of the image when - subject to these tables. If the absolute colorimetric intent is - chosen - using -ia in combinations - with - -pj, then Jab with - a fixed white reference is used, which emulates an absolute CIECAM02 - Jab - appearance space.
+ image is to be transformed through the perceptual or saturation + tables of a profile as part of a link with an Argyll generated + output profile, since it will then represent the apparent gamut of + the image when subject to these tables. If the absolute colorimetric + intent is chosen using -ia + in combinations with -pj, + then Jab with a fixed white reference is used, which emulates + an absolute CIECAM02 Jab appearance space.

The -c parameter sets the output space to CIECAM02 appearance Jab values, and also allows - choosing - a set of viewing conditions, either by choosing a typical viewing - environment, or controlling - particular viewing condition parameters. This is only functional if - an - ICC profile is provided.
+ choosing a set of viewing conditions, either by choosing a typical + viewing environment, or controlling particular viewing condition + parameters. This is only functional if an ICC profile is provided.

The -O parameter allows the output file name & extension to be specified independently of - the - last tiff/jpeg - filename. Note that the full filename must be specified, including - the - extension.
+ the last tiff/jpeg filename. Note that the full filename must be + specified, including the extension.

If the TIFF or JPEG files are in a device space (ie. RGB, CMYK - etc.), then it - is - necessary to supply an ICC profile to translate the device space - values - to a CIE space value such as L*a*b* or CIECAM02 Jab space for - creating - a gamut surface. For the ICC profile provided it is then possible to - select exactly what type of conversion is used. A TIFF or JPEGfile - with an - embedded ICC profile may be supplied as the profile argument - e.g. - to - get the gamut of a tiff file that contains an embedded profile use - something like:
+ etc.), then it is necessary to supply an ICC profile to translate + the device space values to a CIE space value such as L*a*b* or + CIECAM02 Jab space for creating a gamut surface. For the ICC profile + provided it is then possible to select exactly what type of + conversion is used. A TIFF or JPEGfile with an embedded ICC profile + may be supplied as the profile argument - e.g. to get the gamut of a + tiff file that contains an embedded profile use something like:

    tiffgamut image.tif image.tif

- If a TIFF file is - already in a CIE space such as CIELab or ICCLab, then it is not - necessary to select an ICC profile, although a PCS to PCS - colorspace profile may be chosen. All the TIFF and JPEG files - must be in the same colorspace.
+ To create a gamut suitable for CIECAM02 gamut mapping space in + colprof or collink, something like
+
+     tiffgamut -ir -pj -cmt image.icm image.tif
+
+ where the viewing conditions "mt" should the same as the source + conditions in colprof or collink.
+
+ If a TIFF file is already in a CIE space such as CIELab or ICCLab, + then it is not necessary to select an ICC profile, although a + PCS to PCS colorspace profile may be chosen. All the TIFF and JPEG + files must be in the same colorspace.

One or more TIFF and/or JPEG files may be specified, and the gamut - is the union of - the gamuts of each file. This is useful for creating an image - specific - gamut mapping that can be applied to a set of images with consistent - results between the images. Note that the output gamut file name - will - by default be taken from the last TIFF or JPEG file specified, with - the .gam - extension added automatically. The -O - parameter will override this default.
+ is the union of the gamuts of each file. This is useful for creating + an image specific gamut mapping that can be applied to a set of + images with consistent results between the images. Note that the + output gamut file name will by default be taken from the last TIFF + or JPEG file specified, with the .gam extension added automatically. + The -O parameter will + override this default.

NOTES

@@ -342,12 +323,9 @@ f:x:y        and black points. For the purposes of latter gamut mapping, it is assumed that the image should retain it's position within the colorspace dynamic range. For an L*a*b* image, the values value - 100,0,0 - and 0,0,0 for white and black are assumed. An image in L*a*b* should - be - adjusted be neutral to, and sit within the dynamic range of those - white - and black points.
+ 100,0,0 and 0,0,0 for white and black are assumed. An image in + L*a*b* should be adjusted be neutral to, and sit within the dynamic + range of those white and black points.

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