pgmramp

pgmramp -lr|-tb | -rectangle|-ellipse width height

Generates a graymap of the specified size containing a black-to-white ramp. These ramps are useful for multiplying with other images, using the pnmarith tool.

-lr

A left to right ramp.

-tb

A top to bottom ramp.

-rectangle

A rectangular ramp.

-ellipse

An elliptical ramp.

All flags can be abbreviated to their shortest unique prefix.

pnmarith(1), pgm(5)

Copyright (C) 1989 by Jef Poskanzer.