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.

                                           06 April 89                                 fstopgm(1)