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)