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.\"     Title: gifhisto
.\"    Author: [see the "Author" section]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 2 May 2012
.\"    Manual: GIFLIB Documentation
.\"    Source: GIFLIB
.\"  Language: English
.\"
.TH "GIFHISTO" "1" "2 May 2012" "GIFLIB" "GIFLIB Documentation"
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.SH "NAME"
gifhisto \- make a color histogram from GIF colr frequencies
.SH "SYNOPSIS"
.HP \w'\fBgifhisto\fR\ 'u
\fBgifhisto\fR [\-v] [\-t] [\-s\ \fIwidth\fR\ \fIheight\fR] [\-n\ \fIimage\-number\fR] [\-b] [\-h] [\fIgif\-file\fR]
.SH "DESCRIPTION"
.PP
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\&.
.PP
If no GIF file is given, gifhisto will try to read a GIF file from stdin\&.
.SH "OPTIONS"
.PP
\-v
.RS 4
Verbose mode (show progress)\&. Enables printout of running scan lines\&.
.RE
.PP
\-t
.RS 4
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\&.
.sp
The colormap picked is the one to be used for the image to generate histogram for, as defined in GIF format\&.
.RE
.PP
\-s width height
.RS 4
Size of GIF histogram file\&. The height of the histogram should be power of 2 dividable by number of colors in colormap\&.
.sp
Width sets the resolution (accuracy if you like) of the histogram as the maximum histogram bar is scaled to fit it\&.
.RE
.PP
\-n image\-number
.RS 4
Image number to test\&. Default is one\&.
.RE
.PP
\-b
.RS 4
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\&.
.RE
.PP
\-h
.RS 4
Print one line of command line help, similar to Usage above\&.
.RE
.SH "AUTHOR"
.PP
Gershon Elber
