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x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
Ppmshift User Manual(0)                                Ppmshift User Manual(0)

NAME
       ppmshift - shift lines of a PPM image left or right by a random amount

SYNOPSIS
       ppmshift shift [ppmfile]

DESCRIPTION
       This program is part of Netpbm(1).

       ppmshift reads a PPM image as input.  It shifts every row of image data
       to the left or right by a random amount, within a range of  shift  pix-
       els.  The random distribution is uniform, centered at zero movement.

       The  randomness  in  the image is limited before Netpbm 10.37 (December
       2006) -- if you run the program twice in the same second, you  may  get
       identical output.

       This  is an effect the author intended to use for MPEG tests.  Unfortu-
       nately, this program is not useful for that -  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 favorite 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
            pamcut -top=0 -width=800 -height=300 cs.ppm >upper.ppm

            #take the lower half, flip it upside down, dim it and distort it a little
            pamcut -top=300 -width=800 -height=300 cs.ppm | \
                pamflip -topbottom | \
                ppmdim 0.7 | \
                ppmshift 10 >lower.ppm

            #and concatenate the two pieces
            pnmcat -topbottom 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), pamcut(1), pamflip(1), ppmdim(1), pnmcat(1)

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/ppmshift.html

netpbm documentation           20 November 2008        Ppmshift User Manual(0)

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