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Rasttopnm User Manual(0)			      Rasttopnm User Manual(0)

NAME
       rasttopnm - convert a Sun rasterfile to a PNM image

SYNOPSIS
       rasttopnm

       [-index]

       [rastfile]

DESCRIPTION
       This program is part of Netpbm(1).

       rasttopnm  reads	 a Sun rasterfile as input and produces a PNM image as
       output.	The type of the output file depends on the  input  file	 -  if
       it's black and white, rasttopnm writes a PBM image.  If it's grayscale,
       rasttopnm writes a PGM.	If it's color, rasttopnm writes	 a  PPM.   The
       program tells you which type it is generating.

OPTIONS
       -index This  odd option tells rasttopnm to use the color map indices in
	      the raster as if they are the color values.

	      In a colormapped Sun rasterfile, the header of the file contains
	      a	 color	map,  associating each unique color that occurs in the
	      file with an index number.  The raster portion of the file  then
	      represents  the  color  of  a  pixel  with one of those colormap
	      indices.

	      This option has found use as follows: take a  regular  grayscale
	      Sun rasterfile in which all the grayscale value are represented,
	      so the colormap indices are identical to the color values.  Mod‐
	      ify  its	color  map  so as to alter the colors in the image, in
	      particular to equalize the colors.  With that  modified  raster‐
	      file  as	input,	rasttopnm without -index produces the modified
	      image.  But with -index, it  produces  the  original  unmodified
	      image.

	      This option was new in Netpbm 10.56 (September 2011).

SEE ALSO
       pnmtorast(1), pnm(1)

AUTHOR
       Copyright (C) 1989, 1991 by Jef Poskanzer.

netpbm documentation		16 August 2011	      Rasttopnm User Manual(0)

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