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gifhisto(1)                  GIFLIB Documentation                  gifhisto(1)




NAME

       gifhisto - make a color histogram from GIF colr frequencies


SYNOPSIS

       gifhisto [-v] [-t] [-s width height] [-n image-number] [-b] [-h]
                [gif-file]


DESCRIPTION

       A program to create histogram of number of pixels using each color. The
       output can be formatted into a GIF histogram file, or as text file -
       both go to stdout.

       If no GIF file is given, gifhisto will try to read a GIF file from
       stdin.


OPTIONS

       -v
           Verbose mode (show progress). Enables printout of running scan
           lines.

       -t
           Force output to be text file of the following form: (colormap size)
           lines each containing two integers: number of times color appeared,
           and color index. Lines are in increasing color index order. This
           output can be fed directly to a sort program if ordering by color
           frequency is desired.

           The colormap picked is the one to be used for the image to generate
           histogram for, as defined in GIF format.

       -s width height
           Size of GIF histogram file. The height of the histogram should be
           power of 2 dividable by number of colors in colormap.

           Width sets the resolution (accuracy if you like) of the histogram
           as the maximum histogram bar is scaled to fit it.

       -n image-number
           Image number to test. Default is one.

       -b
           Zeros the background color count. As only linear scale bars are
           supported and usually the background appears much more often then
           other colors, deleting the background count will improve the
           scaling of other colors.

       -h
           Print one line of command line help, similar to Usage above.


AUTHOR

       Gershon Elber



GIFLIB                            2 May 2012                       gifhisto(1)

giflib 5.2.1 - Generated Tue Jan 19 15:24:25 CST 2021
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