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
       ⟨libnetpbm_image.html#colorname⟩ .

       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 ⟨index.html#commonoptions⟩ ), 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