I've written a simple ImageMagick shell script to batch convert a bunch of images into the various sizes required by Pachyderm. Man, ImageMagick is pretty sweet. Installed in a few minutes using Fink, the I was off and running. I call this script to generate the images, which can then be fed to Generator to create the .swf files used by Pachyderm:
#!/bin/sh
for img in `ls *.jpg`
do
convert -sample 46x36 ../11/
convert -sample 56x56 ../12/
convert -sample 72x72 ../13/
convert -sample 160x160 ../14/
convert -sample 280x200 ../15/
convert -sample 300x260 ../16/
convert -sample 480x380 ../17/
convert -sample 790x540 ../18/
convert -sample 1280x1024 ../19/
convert -sample 72x72 ../23/
done