Manual: pamgradient

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 argument of the pnm_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
       In addition to the options common to all programs based on libnetpbm (most notably  -quiet,  see	  Common Options  ),
       pamgradient recognizes the following command line option:

       -maxval=maxval

	      maxval of the generated image.  (See PAM(1) and PNM(1) specifications).

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 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.

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)