CentOS 7.0 - man page for pgmramp (centos section 0)
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Pgmramp User Manual(0) Pgmramp User Manual(0)
pgmramp - generate a grayscale ramp
pgmramp -lr|-tb|-rectangle|-ellipse -maxval=maxval width height
All options can be abbreviated to their shortest unique prefix. You may use two hyphens
instead of one to designate an option. You may use either white space or an equals sign
between an option name and its value.
This program is part of Netpbm(1)
Generates a graymap of the specified size containing a black-to-white ramp. These ramps
are useful for multiplying with other images, using pamarith.
The ramp is linear in brightness, not intensity. I.e. the gamma-corrected sample values
in the PGM rise linearly with distance from the corner of the image. If you want a ramp
that is linear in light intensity, use pnmgamma with pgmramp.
To generate a simple ramp of all the values from 0 to maxval, and not necessarily a
graphic image, use pamseq(1)
ppmrainbow does something similar to what pgmramp does, but for color. The image fades
between two colors of your choice.
You must specify exactly one of the ramp type options.
-lr A left to right ramp.
-tb A top to bottom ramp.
An outside-in rectangular ramp. It is black around the edges and white in the cen-
An outside-in elliptical ramp. It is black around the edge and white in the cen-
The maxval for the generated image. Default is 255.
This option did not exist before June 2002. Before, the maxval was
pamarith(1) , pnmgamma(1) , pamseq(1) , ppmrainbow(1) , pamgradient(1) , pgm(1)
Copyright (C) 1989 by Jef Poskanzer.
netpbm documentation 04 June 2002 Pgmramp User Manual(0)
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