1GIFHISTO(1)                  GIFLIB Documentation                  GIFHISTO(1)
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NAME

6       gifhisto - make a color histogram from GIF colr frequencies
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SYNOPSIS

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

13       A program to create histogram of number of pixels using each color. The
14       output can be formatted into a GIF histogram file, or as text file -
15       both go to stdout.
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17       If no GIF file is given, gifhisto will try to read a GIF file from
18       stdin.
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OPTIONS

21       -v
22           Verbose mode (show progress). Enables printout of running scan
23           lines.
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25       -t
26           Force output to be text file of the following form: (colormap size)
27           lines each containing two integers: number of times color appeared,
28           and color index. Lines are in increasing color index order. This
29           output can be fed directly to a sort program if ordering by color
30           frequency is desired.
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32           The colormap picked is the one to be used for the image to generate
33           histogram for, as defined in GIF format.
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35       -s width height
36           Size of GIF histogram file. The height of the histogram should be
37           power of 2 dividable by number of colors in colormap.
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39           Width sets the resolution (accuracy if you like) of the histogram
40           as the maximum histogram bar is scaled to fit it.
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42       -n image-number
43           Image number to test. Default is one.
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45       -b
46           Zeros the background color count. As only linear scale bars are
47           supported and usually the background appears much more often then
48           other colors, deleting the background count will improve the
49           scaling of other colors.
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51       -h
52           Print one line of command line help, similar to Usage above.
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AUTHOR

55       Gershon Elber
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59GIFLIB                            2 May 2012                       GIFHISTO(1)
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