CentOS 7.0 - man page for pamgradient (centos section 0)
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Pamgradient User Manual(0) Pamgradient User Manual(0)
pamgradient - create a four-corner gradient PAM image
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.
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 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).
maxval of the generated image. (See PAM(1)
pamgradient(1) , ppmmake(1) , ppmrainbow(1) , pgmramp(1) , ppmpat(1) , pam(1) , pnm(1)
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.
pamgradient was new in Netpbm 10.31 (December 2005).
pamgradient was written by Daniel Haude in October 2005.
netpbm documentation 21 October 2005 Pamgradient User Manual(0)
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