\
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.TH "Ppmspread User Manual" 0 "20 November 2008" "netpbm documentation"

.SH NAME

ppmspread - displace a PPM image's pixels by a random amount

.UN synopsis
.SH SYNOPSIS

\fBppmspread\fP \fIamount\fP [\fIppmfile\fP]

.UN description
.SH DESCRIPTION
.PP
This program is part of
.BR Netpbm (1)
.
.PP
\fBppmspread\fP reads a PPM image as input and moves every pixel
around a random bit relative to its original position. \fIamount\fP
determines by how many pixels a pixel is to be moved around at most.
.PP
Pictures processed with this filter will seem to be somewhat
dissolved or unfocussed (although they appear more coarse than images
processed by something like \fIpnmconvol\fP).
.PP
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.


.UN seealso
.SH SEE ALSO
.BR ppm (5)
, 
.BR pnmconvol (1)


.UN author
.SH AUTHOR

Copyright (C) 1993 by Frank Neumann