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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 in-
       creases 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.

       pambrighten does	a more normal kind of  brightening.   pamfunc  does  a
       very  simple  brightening.   Both  pambrighten  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
       pambrighten(1) pamfunc(1), pnmgamma(1), ppm(5),

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)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | AUTHOR | DOCUMENT SOURCE

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