xicc/tiffgamut
    Summary
    Create a gamut file or X3DOM 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 X3DOM 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, something that can be of
    particular importance if your images are encoded in a large gamut
    space such as L*a*b*, ProPhoto, scRGB etc.
    
    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" See Image dependent gamut mapping using
      device links for an example workflow.
    
    See 3D Viewing Format for switching to
    VRML or X3D output format.
    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
       -w           
emit
        X3DOM .x3d.html file as well as CGATS .gam file
       -n           
Don't
        add X3DOM axes or white/black point
       -k           
Add
        markers for prim. & sec. "cusp" points
         -f perc       Filter by
        popularity, perc = percent to use
       -i
        intent     p = perceptual, r = relative
        colorimetric,
                    
s
        = saturation, a = absolute (default), d = profile default
     -o
        order      n = normal (priority: lut
        > matrix > monochrome)
                    
r
        = 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)
             
  
        pe - Print evaluation environment (CIE 116-1995)
             
  
        pc - Critical print evaluation environment (ISO-3664 P1)
            
            mt - Monitor in typical work environment
            
 
          mb - Monitor in bright work environment
          
              md - Monitor in darkened work
        environment
          
              jm - Projector in dim environment
          
              jd - Projector in dark environment
           
            pcd - Photo CD - original scene outdoors
          
              ob - Original scene - Bright Outdoors
          
              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)
              
w:x:y       
        Adapted white point as x, y
              
a:adaptation
        Adaptation luminance in cd.m^2 (default 50.0)
              
b:background
        Background % of image luminance (default 20)
                 l:imagewhite Image
        white in cd.m^2 if surround = auto (default 250)
            
f:flare     
            Flare light % of image luminance (default 1)
                  
        g:glare      Glare light % of ambient
        (default 5)
           
           g:X:Y:Z      Glare color
        as XYZ (default media white)
              
        g:x:y        Glare color as
        x, y
     -x
            pcent      Expand/compress gamut
            cylindrically by percent
         -O outputfile Override the default output filename &
        extension.
      
    Usage Details and Discussion
    
    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 -w flag causes a X3DOM file to be produced, as well as a
    gamut file.
    
    The -n flag suppresses the L*a*b* axes being created in the
    X3DOM.
    
    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.
    
    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.
    
    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.
    
    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
    order.    
    
    -p: By default the gamut
    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
    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. 
    
    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.
    
    The -x parameter allows expanding or compressing the
    resulting gamut in a cylindrical direction by the given percentage
    :- i.e "-x 120" will expand by 20%. This may be useful for creating
    a general compression gamut mapping by using such an expanded device
    gamut as input to collink -g or -G.
    
    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.
    
    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:
    
        tiffgamut image.tif image.tif
    
    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.
    
    NOTES
    
    The white and black points put in the gamut are the colorspace white
    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.