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ppmbrighten(1)


NAME

   ppmbrighten - change an images Saturation and Value from an HSV map

SYNOPSIS

   ppmbrighten [-n] [-s <+- saturation>] [-v <+- value>] <ppmfile>

DESCRIPTION

   Reads a portable pixmap as input.  Converts the image from RGB space to
   HSV space and  changes  the  Value  by  <+-  value>  as  a  percentage.
   Likewise with the Saturation.  Doubling the Value would involve

   ppmbrighten -v 100

   to add 100 percent to the Value.

   The  'n'  option  normalizes  the  Value  to  exist  between  0  and  1
   (normalized).

SEE ALSO

   pgmnorm(1), ppm(5)

AUTHOR

   Copyright (C) 1990 by Brian Moffet Copyright (C) 1989 by Jef Poskanzer.

   Permission to use, copy, modify, and distribute this software  and  its
   documentation  for  any  purpose  and  without  fee  is hereby granted,
   provided that the above copyright notice appear in all copies and  that
   both  that  copyright  notice  and  this  permission  notice  appear in
   supporting documentation.  This software is provided  "as  is"  without
   express or implied warranty.

NOTES

   This program does not change the number of colors.

                              20 Nov 1990                   ppmbrighten(1)



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