Manual: ppmflash

Ppmflash User Manual(1)				   General Commands Manual			     Ppmflash User Manual(1)

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.

       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.

OPTIONS
       There are no command line options defined specifically for ppmflash, but it recognizes the options common to all pro‐
       grams based on libnetpbm (See  Common Options .)

SEE ALSO
       pambrighten(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(1)