pgmramp(1) [xfree86 man page]

pgmramp(1)						      General Commands Manual							pgmramp(1)

NAME

       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)

pnmarith(1)                                                   General Commands Manual                                                  pnmarith(1)

NAME

       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 <wijkstra@fwi.uva.nl>

                                                                  26 August 1993                                                       pnmarith(1)