pgmramp
Generate a greyscale map.
TLDR
Generate a left-to-right greyscale map
$ pgmtexture -lr > [path/to/output.pgm]
Generate a top-to-bottom greyscale map
$ pgmtexture -tb > [path/to/output.pgm]
Generate a rectangular greyscale map
$ pgmtexture -rectangle > [path/to/output.pgm]
Generate a elliptical greyscale map
$ pgmtexture -ellipse [path/to/image.pgm] > [path/to/output.pgm]
Generate a greyscale map from the top-left corner to the bottom-right corner
$ pgmtexture -diagonal [path/to/image.pgm] > [path/to/output.pgm]
