pgmramp

generates grayscale gradient images

Create horizontal gradient

$ pgmramp -lr [256] [256] > [gradient.pgm]

Create vertical gradient

$ pgmramp -tb [256] [256] > [gradient.pgm]

Create diagonal gradient

$ pgmramp -diagonal [256] [256] > [gradient.pgm]

Create circular gradient

$ pgmramp -ellipse [256] [256] > [gradient.pgm]

pgmramp type width height

pgmramp generates grayscale gradient images. Creates various gradient patterns for testing and backgrounds. Part of Netpbm toolkit.

-lr

Left to right gradient.

-tb

Top to bottom gradient.

-rectangle

Rectangle gradient.

-ellipse

Elliptical gradient.

-diagonal

Diagonal gradient.

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