pngtopnm
Convert PNG images to PNM format
TLDR
Convert PNG to PNM
$ pngtopnm [input.png] > [output.pnm]
Extract alpha to separate file$ pngtopnm -alpha [input.png] > [alpha.pgm]
SYNOPSIS
pngtopnm [options] [file]
DESCRIPTION
pngtopnm converts PNG images to PNM (PBM/PGM/PPM) format. Part of Netpbm toolkit for image conversion. Output type depends on PNG color depth.
PARAMETERS
-alpha
Extract alpha channel as PGM.-mix
Mix with background color.-background color
Background color for mixing.-verbose
Verbose output.
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