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NAME

       gifhisto - 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.

USAGE

       gifhisto  [-q]  [-t]  [-s  Width  Height]  [-n  ImageNumber]  [-b] [-h]
       gif-file

       If no gif-file is given, GifHisto will try to  read  a  GIF  file  from
       stdin.

MEMORY REQUIRED

       Line.

OPTIONS

       [-q]

               Quiet  mode.   Default  off  on  MSDOS, on under UNIX. Controls
              printout of running scan lines.  Use -q- to invert.

       [-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 colrmap 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 ImageNumber]

               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

       Man page created by T.Gridel <tgridel@free.fr>, originally  written  by
       Eric S. Raymond <esr@thyrsus.com>

                                 giflib-tools                      gifhisto(1)



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