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Ppmflash User Manual(0) Ppmflash User Manual(0)
NAME
ppmflash - brighten a picture to approach white
SYNOPSIS
ppmflash flashfactor [ppmfile]
DESCRIPTION
This program is part of Netpbm(1).
ppmflash reads a PPM image as input. It changes the color of each pixel to bring it a
specified amount closer to white. It generates a PPM image of the result.
flashfactor is a real number between 0 and 1, inclusive. ppmflash increases the intensity
of each RGB component by the fraction flashfactor of the difference between the current
value and full intensity. So if a pixel contains 60% full red, 10% full green, and no
blue and you specify 0.5 (half), ppmflash increases the red to 80% (because it was 40%
from full intensity, so it adds half of 40% to the original 60%), the green to 55%, and
the blue to 50%.
If flashfactor is zero, the output is identical to the input. If flashfactor is one, the
output is all white.
ppmbrighten does a more normal kind of brightening. pamfunc does a very simple brighten-
ing. Both ppmbrighten and pamfunc can reduce brightness as well.
pnmgamma is another way people do a similar brightening, though it isn't really intended
for that.
SEE ALSO
ppmbrighten(1) pamfunc(1), pnmgamma(1), ppm(1),
AUTHOR
Copyright (C) 1993 by Frank Neumann
DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML source. The master
documentation is at
http://netpbm.sourceforge.net/doc/ppmflash.html
netpbm documentation 26 January 2003 Ppmflash User Manual(0)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
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