ppmrainbow
Generate multi-color gradient images
TLDR
Generate rainbow gradient
$ ppmrainbow -width [100] -height [50] [color1] [color2] > [output.ppm]
Create red to blue gradient$ ppmrainbow -width 200 -height 100 red blue > [gradient.ppm]
Multiple color gradient$ ppmrainbow -width 300 -height 50 red yellow green blue > [rainbow.ppm]
SYNOPSIS
ppmrainbow [options] colors
DESCRIPTION
ppmrainbow creates a horizontal color gradient image that smoothly transitions through the specified color stops. Any number of named colors can be provided, and the tool interpolates between them evenly across the image width.This is useful for creating gradient backgrounds, color bars for testing, or decorative elements. The -norepeat option prevents the gradient from wrapping back to the first color. Part of the Netpbm toolkit.
PARAMETERS
COLORS
Color stops.-width N
Output width.-height N
Output height.-norepeat
Don't repeat spectrum.
INSTALL
sudo apt install netpbm
sudo dnf install netpbm
sudo pacman -S netpbm
sudo apk add netpbm-extras
sudo zypper install netpbm
brew install netpbm
nix profile install nixpkgs#netpbm
CAVEATS
Horizontal gradient only. Part of Netpbm suite.
HISTORY
ppmrainbow was created as part of Netpbm for gradient generation.
