CentOS 7.0 - man page for ppmflash (centos section 0)
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Ppmflash User Manual(0) Ppmflash User Manual(0)
ppmflash - brighten a picture to approach white
ppmflash flashfactor [ppmfile]
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
pamfunc(1) , pnmgamma(1) , ppm(1) ,
Copyright (C) 1993 by Frank Neumann
netpbm documentation 26 January 2003 Ppmflash User Manual(0)
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