fstopgm
Usenix FaceSaver to PGM converter
TLDR
Convert Usenix FaceSaver to PGM
$ fstopgm < [input.fs] > [output.pgm]
SYNOPSIS
fstopgm [input]
DESCRIPTION
fstopgm converts Usenix FaceSaver format images to PGM (Portable Graymap) format. The Usenix FaceSaver was an early format used for storing grayscale face images in online directory systems. This tool is part of the Netpbm image processing toolkit, which provides utilities for converting between numerous graphics formats.The conversion reads from standard input and writes to standard output, making it suitable for pipeline operations with other Netpbm tools.
INSTALL
sudo apt install netpbm
sudo dnf install netpbm
sudo pacman -S netpbm
sudo apk add netpbm
sudo zypper install netpbm
brew install netpbm
nix profile install nixpkgs#netpbm
CAVEATS
The Usenix FaceSaver format is obsolete and rarely encountered today. This tool is part of the Netpbm suite and may not be included in all Netpbm distributions. Input must be in valid FaceSaver format or the conversion will fail.