<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>tiffgamut</title> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> <meta name="author" content="Graeme Gill"> </head> <body> <h2><b>xicc/tiffgamut</b></h2> <h3>Summary</h3> Create a gamut file or VRML file of the color gamut of the contents of a set of TIFF image.<br> <br> <span style="font-weight: bold;">tiffgamut</span> allows creation of gamut files from the pixel values in a set of TIFF 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 <a href="collink.html"> collink</a>.<br> <br> <span style="font-weight: bold;">NOTE</span> that if you are creating an image gamut suitable for use with the <a href="collink.html">collink</a> <a href="collink.html#g">-g</a> or <a href="collink.html#G">-G</a> flags, or <a href="colprof.html#g">colprof -g</a>, use the Jab appearance space intent for appearance space gamut mappings, and the same input viewing conditions to be used in <span style="font-weight: bold;">collink</span> or <span style="font-weight: bold;">colprof</span> using the -c flag, i.e. "tiffgamut -pj -cmt sRGB.icm image.tif"<br> <h3>Usage Summary</h3> <small><span style="font-family: monospace;">tiffgamut [-v level] [profile.icm | embedded.tif] infile1.tif [infile2.tif ...]</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> -v Verbose</span><br style="font-family: monospace;"> <span style="font-family: monospace;">-d sres Surface resolution details 1.0 - 50.0</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> -w emit VRML .wrl file as well as CGATS .gam file</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> -n Don't add VRML axes or white/black point</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> -k Add markers for prim. & sec. "cusp" points<br> -f perc Filter by popularity, perc = percent to use<br style="font-family: monospace;"> </span><span style="font-family: monospace;"> -i intent p = perceptual, r = relative colorimetric,</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> s = saturation, a = absolute (default), d = profile default</span></small><small><span style="font-family: monospace;"></span></small><br style="font-family: monospace;"> <small><span style="font-family: monospace;"></span><span style="font-family: monospace;"> -o order n = normal (priority: lut > matrix > monochrome)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> r = reverse (priority: monochrome > matrix > lut)<br> </span></small><small><span style="font-family: monospace;"> </span><span style="font-family: monospace;">-p oride</span><span style="font-family: monospace;"> l = Lab_PCS (default), j = CIECAM02 Appearance Jab</span></small><br style="font-family: monospace;"> <small><span style="font-family: monospace;"></span><span style="font-family: monospace;"> -c viewcond set appearance mode and viewing conditions for CIECAM02,</span><br style="font-family: monospace;"> <span style="font-family: monospace;"></span><span style="font-family: monospace;"></span></small><small><span style="font-family: monospace;"> either an enumerated choice, or a parameter:value change</span><span style="font-family: monospace;"></span><br style="font-family: monospace;"> <span style="font-family: monospace;"> pp - Practical Reflection Print</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> pe - Print evaluation environment</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> mt - Monitor in typical work environment</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> mb - Monitor in bright work environment</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> md - Monitor in darkened work environment</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> jm - Projector in dim environment</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> jd - Projector in dark environment</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> pcd - Photo CD - original scene outdoors</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> ob - Original scene - Bright Outdoors</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> cx - Cut Sheet Transparencies on a viewing box</span></small><br style="font-family: monospace;"> <small><span style="font-family: monospace;"> s:surround a = average, m = dim, d = dark,</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> c = transparency (default average)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> w:X:Y:Z Adapted white point as XYZ (default media white)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> w:x:y Adapted white point as x, y</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> a:adaptation Adaptation luminance in cd.m^2 (default 50.0)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> b:background Background % of image luminance (default 20)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> f:flare Flare light % of image luminance (default 1)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> f:X:Y:Z Flare color as XYZ (default media white)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> f:x:y Flare color as x, y</span><br style="font-family: monospace;"> </small><br> <h3>Usage Details and Discussion<br> </h3> The<b> -v</b> flag dumps out the ICC profile header information.<br> <br> The <b>-d</b> 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.<br> <br> The <b>-w</b> flag causes a VRML file to be produced, as well as a gamut file.<br> <br> The <b>-n</b> flag suppresses the L*a*b* axes being created in the VRML.<br> <br> The <span style="font-weight: bold;">-k</span> 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.<br> <br> The <span style="font-weight: bold;">-f</span> <span style="font-weight: bold;">perc</span> parameter turns on filtering of the raster colors. The colors from the image are clustered, and then sorted according to popularity, and then the <span style="font-weight: bold;">perc</span> 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 <span style="font-weight: bold;">perc</span> 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.<br> <br> The <b>-i</b> 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.<br> <br> 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 <b>-o</b> flag, reverses this order. <br> <br> <span style="font-weight: bold;">-p</span>: By default the gamut will be created in L*a*b* colorspace. If <span style="font-weight: bold;">-pj</span> 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 <a href="colprof.html">colprof</a>. <span style="font-weight: bold;"><br> </span>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 saturation transforms may be used by selecting them using the <span style="font-weight: bold;">-i</span> 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 <span style="font-weight: bold;">-ia</span> in combinations with <span style="font-weight: bold;">-pj</span>, then Jab with a fixed white reference is used, which emulates an absolute CIECAM02 Jab appearance space. <br> <br> The <span style="font-weight: bold;">-c</span> 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.<br> <br> If the TIFF 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 file with an embeded 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:<br> <br> tiffgamut image.tif image.tif<br> <br> 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.<br> <br> One or more TIFF 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 be taken from the last TIFF file specified, and that all the TIFF files must be in the same colorspace.<br> <span style="font-weight: bold;"></span><br> <br> <br> </body> </html>
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