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.