displace a portable pixmap’s pixels by a random amount
see also :
add an example, a script, a trick and tips
no example yet ...
... Feel free to add your own example above to help other Linux-lovers !
portable pixmap as input. Moves every pixel around a bit
relative to its original position. amount determines by how
many pixels a pixel is to be moved around at most.
processed with this filter will seem to be somewhat
dissolved or unfocussed (although they appear more coarse
than images processed by something like pnmconvol
1993 by Frank Neumann