ppmspread - Man Page

displace a PPM image's pixels by a random amount


ppmspread amount [ppmfile]


This program is part of Netpbm(1).

ppmspread reads a PPM image as input and moves every pixel around a random 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 processed by something like pnmconvol).

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.


There are no command line options defined specifically for ppmspread, but it recognizes the options common to all programs based on libnetpbm (See Common Options .)

See Also

ppm(1), pnmconvol(1)


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



20 November 2008 netpbm documentation