Pamgradient User Manual(1) General Commands Manual Pamgradient User Manual(1)
NAME
pamgradient - create a four-corner gradient PAM 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(1).
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 ]8;;libnetpbm_image.html#colorname\argument of the pnm_parsecolor()
library routine]8;;\ .
If all four colors are gray values, pamgradient creates a grayscale im-
age (PAM tuple type GRAYSCALE). Otherwise, it creates a color image
(PAM tuple type RGB).
OPTIONS
In addition to the options common to all programs based on libnetpbm
(most notably -quiet, see ]8;;index.html#commonoptions\ Common Options]8;;\ ), pamgradient recognizes the
following command line option:
-maxval=maxval
maxval of the generated image. (See PAM(1) and PNM(1) specifica-
tions).
SEE ALSO
pamgradient(1), ppmmake(1), ppmrainbow(1), pgmramp(1), ppmpat(1),
pam(1), pnm(1)
NOTE
Only the top left corner of the generated image has exactly the speci-
fied 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 nar-
row) 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 interpola-
tion 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.
DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML
source. The master documentation is at
http://netpbm.sourceforge.net/doc/pamgradient.html
netpbm documentation 21 October 2005 Pamgradient User Manual(1)
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