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pamgradient(1) |
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pamgradient
Updated: 21 October 2005
Table Of Contents
NAME
pamgradient - create a four-corner gradient PAM or PNM image
SYNOPSIS
pamgradient [-maxval=maxval]
color-tl color-tr color-bl color-br
width height
Minimum unique abbreviation of
option is acceptable. You may use double
hyphens instead of single hyphen to denote options. You may
use white space
in place of the equals sign to separate an option name from
its value.
DESCRIPTION
This program is part of Netpbm.
pamgradient creates an image of
the specified dimensions width by height
which contains a smooth, two-dimensional gradient between
the specified
colors of the four corners (from top left to bottom
right).
Specify the colors as described
for the argument of the ppm_parsecolor()
library routine.
If all four colors are gray
values, pamgradient creates a grayscale image
(PAM tuple type GRAYSCALE). Otherwise, it creates a color
image (PAM tuple
type RGB).
OPTIONS
-maxval=maxval
maxval of the generated image. (See PAM and PNM
specifications).
SEE ALSO
ppmmake, ppmrainbow, pgmramp, ppmpat, pam, pnm
NOTE
Only the top left corner of the
generated image has exactly the specified
color. The color of the top right corner is a bit shifted to
the left, the
bottom left corner a bit up, and the bottom right corner
left and up. This
ensures nice transitions when combining adjacent (very
narrow) gradients,
and doesn’t play a role when the gradient butts
against a solid surface.
This effect is created by the
integer arithmetic used for the interpolation
of the color values, and since it doesn’t make a
difference for all
practical purposes I might as well sell it as a feature.
HISTORY
pamgradient was new in Netpbm 10.31 (December 2005).
AUTHOR
pamgradient was written by
Daniel Haude in October 2005.
_________________________________________________________________
Table Of Contents
* NAME
* SYNOPSIS
* DESCRIPTION
* OPTIONS
* SEE ALSO
* NOTE
* HISTORY
* AUTHOR
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pamgradient(1) | |