filter an image by replacing each pixel with a function of nearby pixels

<DT><B><a href="ppmshift.html">ppmshift</a>      </B>
<DD>shift lines of PPM image left or right a random amount

<DT><B><a href="ppmspread.html">ppmspread</a>     </B>
<DD>move pixels of PPM image a random amount

<DT><B><a href="pnmconvol.html">pnmconvol</a>     </B>
<DD>general MxN convolution on an image.  Can blur an image.

<DT><B><a href="pgmmorphconv.html">pgmmorphconv</a></b>
<DD>perform morphological convolutions on a PGM im