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Ppmtopcx User Manual(0) 						  Ppmtopcx User Manual(0)

       ppmtopcx - convert a PPM image to a PCX file











       This program is part of Netpbm(1)

       ppmtopcx  reads	a  PPM image as input and produces a PCX file as output.  The type of the
       PCX file depends on the number of colors in the input image:

       16 colors or fewer:
	      1 bit/pixel, 1-4 planes.

       more than 16 colors, but no more than 256:
	      8 bits/pixel, 1 plane, colormap at the end of the file.

       More than 256 colors:
	      24bit truecolor file (8 bits/pixel, 3 planes).

       You can override some of that and explicitly choose the format with the options below.

       -24bit Produce a 24bit truecolor PCX file, even if the image has 256 colors or fewer.

       -8bit  Produce an 8bit (256 colors) PCX file, even if the image has 16 colors or fewer.

	      This option was added in Netpbm 10.18 (August 2003).

	      Use 'packed pixel' format for files with 16 colors or fewer: 1, 2, or 4 bits/pixel,
	      1 plane.

	      Instead of computing a palette from the colors in the image, use a standard, built-
	      in 16 color palette.  If the image contains a color that is  not	in  the  standard
	      palette, ppmtopcx fails.

	      The standard palette is not only a set of colors, but a specific mapping of palette
	      indexes to colors.  E.g. red is 4.

	      You can use pnmremap with a suitable PPM image of the  standard  palette	to  adapt
	      your  image to use exactly those colors in the palette so that ppmtopcx -stdpalette
	      will work on it.

	      The file pcxstd.ppm, part of Netpbm, contains the standard palette.

	      Although the PCX header tells exactly what palette is used in the file, some  older
	      PCX  interpreters  do  not  use that information.  They instead assume the standard
	      palette.	If you don't use the -stdpalette option, ppmtopcx, ppmtopcx may create an
	      image  that  uses a different palette (a rearrangement of the same colors) and then
	      one of these older interpreters would interpret the colors in the image wrong.

	      You cannot specify this option along with -palette.

	      This option was new in Netpbm 10.22 (April 2004).

	      Instead of computing the palette from the colors in the image, use the palette from
	      the file palettefile.  If the palette contains a color that is not in that palette,
	      ppmtopcx fails.

	      The palette file must be a PPM image that contains one pixel for each color in  the
	      palette.	 It  doesn't  matter  what the aspect ratio of the palette image is.  The
	      order of the colors in the PCX palette is the order of the pixels in the PPM  image
	      in  standard  western  reading order (left to right, top to bottom).  If there is a
	      duplicate color in the palette, ppmtopcx chooses between them arbitrarily in build-
	      ing the PCX raster.

	      You  would need this only if you have a PCX reader that can't read the palette that
	      is in the PCX file and instead assumes some particular palette.  See also the -std-
	      palette option.

	      If  your input image might contain colors other than those in your palette, you can
	      convert the input image to one that contains only those colors in your palette with

	      You cannot specify this along with -stdpalette.

	      This option was new in Netpbhm 10.25 (October 2004).

	      Generate	a  PCX	file  with planes planes, even though the number of colors in the
	      image could be represented in fewer.  This makes the  file  larger,  but	some  PCX
	      interpreters are capable of processing only certain numbers of planes.

	      This  is	meaningful  only when ppmtopcx generates an image in the 16 color palette
	      format without  packed  pixels.	Consequently,  you  cannot  specify  this  option
	      together with -24bit or -8bit or -packed.

	      The  valid  values for planes are 1, 2, 3, and 4.  By default, ppmtopcx chooses the
	      smallest number of planes that can represent the colors  in  the	image.	 E.g.  if
	      there are 5 colors, ppmtopcx chooses 3 planes.

	      This option was new in Netpbm 10.21 (March 2004).


	       These  options  set  the position of the image in some field (e.g. on a screen) in
	      columns to the right of the left edge and rows below the top edge.  The PCX  format
	      contains	image  position  information.  Don't confuse this with the position of an
	      area of interest within the image.  For example, using pnmpad to	add  a	10  pixel
	      left  border to an image and then converting that image to PCX with xpos = 0 is not
	      the same as converting the original image to PCX and setting xpos = 10.

	      The values may be from -32767 to 32768.

	      The default for each is zero.

       pcxtoppm(1) , ppm(1)

       Copyright (C) 1994 by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)

       Based on previous work by Michael Davidson.

netpbm documentation			  27 March 2004 		  Ppmtopcx User Manual(0)
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