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, 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 | 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 Oakland, CA.

SEE ALSO
pgmtofs(1) , pgm(5) , pnmnorm(1) , pamenlarge(1) , pamscale(1) , pamditherbw(1)

AUTHOR
Copyright (C) 1989 by Jef Poskanzer.