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1994-03-01
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fstopgm(1) AMIGA (06 April 89) fstopgm(1)
NAME
fstopgm - convert a Usenix FaceSaver(tm) file into a
portable graymap
SYNOPSIS
fstopgm [fsfile]
DESCRIPTION
Reads a Usenix FaceSaver(tm) file as input. Produces a
portable graymap 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 pnmscale 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 pnmscale. Then
use one of the following pipelines:
fstopgm | pgmnorm
fstopgm | pnmscale -whatever | pgmnorm
To go to PBM, you want something more like one of these:
fstopgm | pnmenlarge 3 | pgmnorm | pgmtopbm
fstopgm | pnmenlarge 3 | pnmscale <whatever> | pgmnorm | pgmtopbm
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.
SEE ALSO
pgmtofs(1), pgm(5), pgmnorm(1), pnmenlarge(1), pnmscale(1),
pgmtopbm(1)
AUTHOR
Copyright (C) 1989 by Jef Poskanzer.
Page 1 (printed 3/1/94)