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pgmramp(1) [plan9 man page]

pgmramp(1)						      General Commands Manual							pgmramp(1)

pgmramp - generate a grayscale ramp SYNOPSIS
pgmramp -lr|-tb | -rectangle|-ellipse width height DESCRIPTION
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. OPTIONS
-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. SEE ALSO
pnmarith(1), pgm(5) AUTHOR
Copyright (C) 1989 by Jef Poskanzer. 24 November 1989 pgmramp(1)

Check Out this Related Man Page

pnmarith(1)                                                   General Commands Manual                                                  pnmarith(1)

pnmarith - perform arithmetic on two portable anymaps SYNOPSIS
pnmarith -add|-subtract|-multiply|-difference|-minimum|-maximum. pnmfile1 pnmfile2 DESCRIPTION
Reads two portable anymaps as input. Performs the specified arithmetic operation, and produces a portable anymap as output. The two input anymaps must be the same width and height. The arithmetic is performed between corresponding pixels in the two anymaps, as if maxval was 1.0, black was 0.0, and a linear scale in between. Results that fall outside of [0..1) are truncated. The operator -difference calculates the absolute value of pnmarith -subtract pnmfile1 pnmfile2, i.e. no truncation is done. All flags can be abbreviated to their shortest unique prefix. SEE ALSO
pbmmask(1), pnmpaste(1), pnminvert(1), pnm(5) AUTHOR
Copyright (C) 1989, 1991 by Jef Poskanzer. Lightly modified by Marcel Wijkstra <> 26 August 1993 pnmarith(1)
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