1Pamgradient User Manual(0)                          Pamgradient User Manual(0)
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NAME

6       pamgradient - create a four-corner gradient PAM or PNM image
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SYNOPSIS

10       pamgradient  [-maxval=maxval] color-tl color-tr color-bl color-br width
11       height
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13       Minimum unique abbreviation of option is acceptable.  You may use  dou‐
14       ble  hyphens  instead  of single hyphen to denote options.  You may use
15       white space in place of the equals sign to separate an option name from
16       its value.
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DESCRIPTION

21       This program is part of Netpbm(1).
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23       pamgradient  creates  an  image  of  the  specified dimensions width by
24       height which contains a smooth, two-dimensional  gradient  between  the
25       specified colors of the four corners (from top left to bottom right).
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27       Specify   the   colors   as   described   for   the   argument  of  the
28       ppm_parsecolor() library routine ⟨libppm.html#colorname⟩ .
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30       If all four colors are gray values,  pamgradient  creates  a  grayscale
31       image  (PAM tuple type GRAYSCALE).  Otherwise, it creates a color image
32       (PAM tuple type RGB).
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OPTIONS

36       -maxval=maxval
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39              maxval of the generated image.  (See PAM(1)and  PNM(1)specifica‐
40              tions).
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SEE ALSO

45       ppmmake(1), ppmrainbow(1), pgmramp(1), ppmpat(1), pam(1), pnm(1)
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NOTE

49       Only  the top left corner of the generated image has exactly the speci‐
50       fied color.  The color of the top right corner is a bit shifted to  the
51       left, the bottom left corner a bit up, and the bottom right corner left
52       and up. This ensures nice transitions  when  combining  adjacent  (very
53       narrow)  gradients,  and  doesn't  play  a role when the gradient butts
54       against a solid surface.
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56       This effect is created by the integer arithmetic used for the  interpo‐
57       lation  of the color values, and since it doesn't make a difference for
58       all practical purposes I might as well sell it as a feature.
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HISTORY

62       pamgradient was new in Netpbm 10.31 (December 2005).
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AUTHOR

66       pamgradient was written by Daniel Haude in October 2005.
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70netpbm documentation            21 October 2005     Pamgradient User Manual(0)