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Fstopgm User Manual(0)					Fstopgm User Manual(0)

NAME
       fstopgm - convert a Usenix FaceSaver(tm) file into a PGM image

SYNOPSIS
       fstopgm [fsfile]

DESCRIPTION
       This program is part of Netpbm(1)

       fstopgm	reads  a Usenix FaceSaver(tm) file as input and produces a PGM
       image as output.

       FaceSaver(tm) files sometimes have rectangular pixels.	While  fstopgm
       won't  re-scale	them  into square pixels for you, it will give you the
       precise pamscale command that will do the job.  Because of this,	 read‐
       ing a FaceSaver(tm) image is a two-step process.	 First you do:

	 fstopgm > /dev/null

       This will tell you whether you need to use pamscale.

       Then use one of the following pipelines:
	 fstopgm | pnmnorm
	 fstopgm | pamscale -whatever | pnmnorm

       To go to PBM, you want something more like one of these:
	 fstopgm | pamenlarge 3 | pnmnorm | pamditherbw
	 fstopgm | pamenlarge 3 | pamscale <whatever> | pnmnorm | pamditherbw

       You  want  to enlarge when going to a bitmap because otherwise you lose
       information; but enlarging by more than 3 does not look good.

       FaceSaver is a registered trademark of Metron Computerware Ltd. of Oak‐
       land, CA.

SEE ALSO
       pgmtofs(1)  ,  pgm(1)  ,	 pnmnorm(1)  ,	pamenlarge(1)  , pamscale(1) ,
       pamditherbw(1)

AUTHOR
       Copyright (C) 1989 by Jef Poskanzer.

netpbm documentation		  06 April 89		Fstopgm User Manual(0)
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