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CPALDJVU(1)			 DjVuLibre-3.5			   CPALDJVU(1)

NAME
       cpaldjvu - DjVuDocument encoder for low-color images.

SYNOPSIS
       cpaldjvu	 [options] inputppmfile outputdjvufile

DESCRIPTION
       Program	cpaldjvu  is  a DjVuDocument encoder for images containing few
       colors.	It performs best on images containing large solid color	 areas
       such  as	 screen	 dumps.	 Compression ratios on such images can be much
       higher than those achieved by GIF or PNG compression.

       This program works by first reducing the number of distinct colors to a
       small specified value using a simple color quantization algorithm.  The
       dominant color is encoded into the background layer.  The other	colors
       are encoded into the foreground layer.

OPTIONS
       -dpi n Specify  the resolution information encoded into the output file
	      expressed in dots per inch. The resolution  information  encoded
	      in  DjVu	files  determine how the decoder scales the image on a
	      particular display.  Meaningful resolutions  range  from	25  to
	      6000.  The default value is 300 dpi.

       -colors n
	      Specify  a maximum number of distinct colors for the color quan‐
	      tization algorithm.  process. The default value is 256.  Smaller
	      values can produce much smaller files.

       -bgwhite
	      Cause  the background layer to use the lightest quantified color
	      instead of the dominant color.

       -verbose
	      Display informational messages while running.

REMARKS
       The color quantization might introduce severe degradation if the	 image
       contains photographic areas with a large number of very similar colors.
       Color quantization problems might be solved by pre-processing the input
       file  with  a  different	 quantization program such as ppmquant.	 Avoid
       using the error diffusion dithering algorithm.  This  algorithm	gener‐
       ates random dithering patterns that might be very costly to encode.

BUGS
       This program should be rewritten as a pre-processor for csepdjvu.

CREDITS
       This  program was initially written by Léon Bottou <leonb@users.source‐
       forge.net> and was improved by Bill  Riemers  <docbill@sourceforge.net>
       and many others.

SEE ALSO
       djvu(1), pbm(5), ppmquant(1), pnmtogif(1), pnmtopng(1)

DjVuLibre-3.5			  10/11/2001			   CPALDJVU(1)
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