From 1017cbebe5d5edd859e0fddad0a8600f509f4821 Mon Sep 17 00:00:00 2001 From: giraffedata Date: Mon, 25 Dec 2006 03:06:05 +0000 Subject: Place user guide into Subversion repository git-svn-id: http://svn.code.sf.net/p/netpbm/code/userguide@181 9d0c8265-081b-0410-96cb-a4ca84ce46f8 --- pamgradient.html | 108 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 108 insertions(+) create mode 100644 pamgradient.html (limited to 'pamgradient.html') diff --git a/pamgradient.html b/pamgradient.html new file mode 100644 index 00000000..b6369536 --- /dev/null +++ b/pamgradient.html @@ -0,0 +1,108 @@ + + + + Pamgradient User Manual + + + +

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

+ + + + -- cgit 1.4.1