I've got 4500+ PNG 24 images in 20+ folders that I wish to reduce the size of by converting them to PNG 8. (Aside: I've tried smushing and other png optimisations but the savings are not enough, a test of 2 folders in PS showed PNG 8 should be without significant degradation of the images)
When I tried PS CS3 Batch it wouldn't save over the originals and the new files it creates have no folder structure. Is there a way to fix this or another tool for the job?
I'm running OSX but have access to Windows XP/7.