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.   Like-
       wise 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 (normal-
       ized).

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,  pro-
       vided  that  the  above  copyright notice appear in all copies and that
       both that copyright notice and this permission notice  appear  in  sup-
       porting  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)