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Ppmmix User Manual(0)					 Ppmmix	User Manual(0)

NAME
       ppmmix -	blend together two PPM images

SYNOPSIS
       ppmmix fadefactor ppmfile1 ppmfile2

DESCRIPTION
       This program is part of Netpbm(1).

       ppmmix  reads two PPM images as input and mixes them together using the
       specified fade factor.  The fade	factor may be in the  range  from  0.0
       (only ppmfile1's	image data) to 1.0 (only ppmfile2's image data).  Any-
       thing in	between	specifies a smooth blend between the two images.

       The two images must have	the same dimensions and	the same maxval.   Be-
       fore  Netpbm  10.54  (March  2011),  they  must also have the same type
       (PBM/PGM/PPM).

       The fade	factor is applied to brightness, not  light  intensity.	  That
       means for example that if you have a series of images you generated us-
       ing ppmmix of a black and a white image with a linearly increasing fade
       factor,	you will see an	image getting linearly brighter, but the light
       intensity will increase faster at the end.  That	is because it requires
       more  intensity	change at the bright end of the	scale than at the dark
       end for the human eye to	perceive the  same  brightness	change.	  This
       also  means that	if the original	images aren't all one color, the mixed
       image is	distorted, since the intensity relationship between pixels  is
       different from the original image.

       pamcomp	is a more general alternative.	It allows you to mix images of
       different size and to have the fade factor vary	throughout  the	 image
       (through	 the  use of a transparency mask).  It does not	have the same-
       maxval and same-type  restrictions.   It	 mixes	light  intensity,  not
       brightness.

SEE ALSO
       pamcomp(1), pammixmulti(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/ppmmix.html

netpbm documentation		 23 March 2010		 Ppmmix	User Manual(0)

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

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