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)