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+.\" This man page was generated by the Netpbm tool 'makeman' from HTML source.
+.\" Do not hand-hack it!  If you have bug fixes or improvements, please find
+.\" the corresponding HTML page on the Netpbm website, generate a patch
+.\" against that, and send it to the Netpbm maintainer.
+.TH "Ppmdither User Manual" 0 "16 December 2009" "netpbm documentation"
+
+.SH NAME
+ppmdither - ordered dither for color images
+
+.UN synopsis
+.SH SYNOPSIS
+
+\fBppmdither\fP
+
+[\fB-dim\fP=\fIpower\fP]
+
+[\fB-red\fP=\fIn\fP]
+
+[\fB-green\fP=\fIn\fP]
+
+[\fB-blue\fP=\fIn\fP]
+
+[\fInetpbmfile\fP]
+.PP
+All options can be abbreviated to their shortest unique prefix.
+You may use two hyphens instead of one to designate an option.  You
+may use either white space or an equals sign between an option name
+and its value.
+
+
+.UN description
+.SH DESCRIPTION
+.PP
+This program is part of
+.BR "Netpbm" (1)\c
+\&.
+.PP
+\fBppmdither\fP reads a Netpbm image as input, and applies dithering
+to it to reduce the number of colors used down to the specified number
+of shades for each primary.  It produces a PPM image as output.
+.PP
+The default number of shades is 5 red, 9 green, and 5 blue, for a total of
+225 colors.  To convert the image to a binary rgb format suitable for
+primitive color printers, use \fB-red=2 -green=2 -blue=2\fP.
+.PP
+You can do another kind of dither -- Floyd-Steinberg -- with 
+\fBpnmquant\fP or \fBpnmremap\fP.
+
+.UN options
+.SH OPTIONS
+.PP
+In addition to the options common to all programs based on libnetpbm
+(most notably \fB-quiet\fP, see 
+.UR index.html#commonoptions
+ Common Options
+.UE
+\&), \fBppmdither\fP recognizes the following
+command line options:
+
+
+.TP
+\fB-dim\fP \fIpower\fP
+ The size of the dithering matrix.  The dithering matrix is a
+square whose dimension is a power of 2.  \fIpower\fP is that power of
+2.  The default is 4, for a 16 by 16 matrix.
+
+.TP
+\fB-red\fP=\fIn\fP
+The number of red shades to be used, including black; minimum of 2.
+.sp
+Default is 5.
+
+.TP
+\fB-green\fP \fIn\fP
+The number of green shades to be used, including black; minimum of 2.
+.sp
+Default is 9.
+
+.TP
+\fB-blue\fP \fIn\fP
+The number of blue shades to be used, including black; minimum of 2.
+.sp
+Default is 5.
+
+
+.UN seealso
+.SH SEE ALSO
+.BR "pamditherbw" (1)\c
+\&,
+.BR "pamdepth" (1)\c
+\&,
+.BR "pnmquant" (1)\c
+\&,
+.BR "pnmremap" (1)\c
+\&,
+.BR "ppm" (1)\c
+\&
+
+.UN author
+.SH AUTHOR
+
+Copyright (C) 1991 by Christos Zoulas.
+.SH DOCUMENT SOURCE
+This manual page was generated by the Netpbm tool 'makeman' from HTML
+source.  The master documentation is at
+.IP
+.B http://netpbm.sourceforge.net/doc/ppmdither.html
+.PP
+\ No newline at end of file