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ppmshift - shift lines of a portable pixmap left or right by a random amount
ppmshift shift [ppmfile]
Reads a portable pixmap as input. Shifts every row of image data to the left or right by a
certain amount. The 'shift' parameter determines by how many pixels a row is to be shifted
Another one of those effects I intended to use for MPEG tests. Unfortunately, this pro-
gram will not help me here - it creates too random patterns to be used for animations.
Still, it might give interesting results on still images.
Check this out: Save your favourite model's picture from something like alt.binaries.pic-
tures.supermodels (ok, or from any other picture source), convert it to ppm, and process
it e.g. like this, assuming the picture is 800x600 pixels:
# take the upper half, and leave it like it is
pnmcut 0 0 800 300 cs.ppm >upper.ppm
# take the lower half, flip it upside down, dim it and distort it a little
pnmcut 0 300 800 300 cs.ppm | pnmflip -tb | ppmdim 0.7 |
ppmshift 10 >lower.ppm
# and concatenate the two pieces
pnmcat -tb upper.ppm lower.ppm >newpic.ppm
The resulting picture looks like the image being reflected on a water surface with slight
ppm(5), pnmcut(1), pnmflip(1), ppmdim(1), pnmcat(1)
Copyright (C) 1993 by Frank Neumann
16 November 1993 ppmshift(1)
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