ppmspread(1) [minix man page]

ppmspread(1)                                                  General Commands Manual                                                 ppmspread(1)

NAME

       ppmspread - displace a portable pixmap's pixels by a random amount

SYNOPSIS

       ppmspread amount [ppmfile]

DESCRIPTION

       Reads  a 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.

       Pictures processed with this filter will seem to be somewhat dissolved or unfocussed (although they appear more  coarse  than  images  pro-
       cessed by something like pnmconvol ).

SEE ALSO

       ppm(5), pnmconvol(1)

AUTHOR

       Copyright (C) 1993 by Frank Neumann

                                                                 16 November 1993                                                     ppmspread(1)

ppmshift(1)						      General Commands Manual						       ppmshift(1)

NAME

       ppmshift - shift lines of a portable pixmap left or right by a random amount

SYNOPSIS

       ppmshift shift [ppmfile]

DESCRIPTION

       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 at most.

       Another one of those effects I intended to use for MPEG tests.  Unfortunately, this program will not help me here - it creates  too  random
       patterns to be used for animations. Still, it might give interesting results on still images.

EXAMPLE

       Check  this  out:  Save your favourite model's picture from something like alt.binaries.pictures.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 ripples.

SEE ALSO

       ppm(5), pnmcut(1), pnmflip(1), ppmdim(1), pnmcat(1)

AUTHOR

       Copyright (C) 1993 by Frank Neumann

								 16 November 1993						       ppmshift(1)