sgitopnm
Convert SGI images to PNM format
TLDR
Convert SGI image to PNM
$ sgitopnm [input.rgb] > [output.pnm]
Extract specific channel (0=red, 1=green, 2=blue)$ sgitopnm -channel [0] [input.rgb] > [output.pgm]
Convert with verbose output showing image information$ sgitopnm -verbose [input.rgb] > [output.pnm]
SYNOPSIS
sgitopnm [options] [file]
DESCRIPTION
sgitopnm converts Silicon Graphics image format (SGI RGB) to PNM (Portable aNyMap). SGI images typically use .rgb, .rgba, or .bw extensions. Single-channel images produce PGM output; multi-channel images produce PPM. Part of the Netpbm toolkit.
PARAMETERS
-channel n
Extract specific channel (0=red, 1=green, 2=blue).-verbose
Print image information.
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