pamditherbw
converts grayscale images to black and white using dithering
TLDR
Dither to black and white
$ pamditherbw [input.pgm] > [output.pbm]
Dither with Floyd-Steinberg$ pamditherbw -fs [input.pgm] > [output.pbm]
Dither with threshold$ pamditherbw -threshold -value [0.5] [input.pgm] > [output.pbm]
SYNOPSIS
pamditherbw [options] [file]
DESCRIPTION
pamditherbw converts grayscale images to black and white using dithering. Multiple algorithms available for different quality/speed tradeoffs. Part of Netpbm toolkit.
PARAMETERS
-fs
Floyd-Steinberg dithering.-threshold
Simple threshold.-hilbert
Hilbert curve dithering.-value n
Threshold value (0.0-1.0).
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