Provided by: netpbm_10.0-12.2_i386 bug


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


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


       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


       pgmnorm(1), ppm(5)


       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.


       This program does not change the number of colors.

                                  20 Nov 1990                   ppmbrighten(1)