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

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

       fstopgm [fsfile]

       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, reading 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 | pgmnorm
	 fstopgm | pamscale -whatever | pgmnorm

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

       pgmtofs(1) , pgm(5) , pgmnorm(1) , pamenlarge(1) , pamscale(1) , pamditherbw(1)

       Copyright (C) 1989 by Jef Poskanzer.

netpbm documentation			   06 April 89			   Fstopgm User Manual(0)
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