st4topgm
Convert SBIG ST-4 autoguider images to PGM
TLDR
Convert an SBIG ST-4 image file to PGM
$ st4topgm [input.st4] > [output.pgm]
Read from stdin and convert to PGM$ cat [input.st4] | st4topgm > [output.pgm]
SYNOPSIS
st4topgm [st4file]
DESCRIPTION
st4topgm reads an image in the native format used by the Santa Barbara Instrument Group (SBIG) ST-4 astronomical CCD autoguider cameras and writes the data to standard output as a PGM (Portable Graymap) image.It is part of the Netpbm toolkit. If no input file is specified, it reads from standard input. The program does not provide any custom options; it honors the common libnetpbm options (e.g., `-quiet`, `-plain`).
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
ST-4 files are a legacy astronomical imaging format. Use pgmtost4 to perform the reverse conversion.