ppmmix fadefactor ppmfile1 ppmfile2
This program is part of Netpbm.
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).
Anything in between specifies a smooth blend between the two images.
The two images must have the same dimensions.
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 an alpha mask).
Copyright (C) 1993 by Frank Neumann
netpbm documentation 16 November 1993 Ppmmix User Manual(0)