# phpman > info > fstopgm [fstopgm(1)](https://www.chedong.com/phpMan.php/man/fstopgm/1/markdown) General Commands Manual [fstopgm(1)](https://www.chedong.com/phpMan.php/man/fstopgm/1/markdown) 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, read- ing 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 | 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 Oak- land, CA. SEE ALSO [pgmtofs(1)](https://www.chedong.com/phpMan.php/man/pgmtofs/1/markdown), [pgm(5)](https://www.chedong.com/phpMan.php/man/pgm/5/markdown), [pgmnorm(1)](https://www.chedong.com/phpMan.php/man/pgmnorm/1/markdown), [pnmenlarge(1)](https://www.chedong.com/phpMan.php/man/pnmenlarge/1/markdown), [pnmscale(1)](https://www.chedong.com/phpMan.php/man/pnmscale/1/markdown), [pgmtopbm(1)](https://www.chedong.com/phpMan.php/man/pgmtopbm/1/markdown) AUTHOR Copyright (C) 1989 by Jef Poskanzer. 06 April 89 [fstopgm(1)](https://www.chedong.com/phpMan.php/man/fstopgm/1/markdown)