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CentOS 7.0 - man page for ppmflash (centos section 0)

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
       for that.


       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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