The maintainer of Netpbm is Bryan Henderson, and I have been communicating with him with a view to enhance the utilities to perform a png overlay function, as we currently do with Vovchik's 'pngoverlay'. There were some iterations, but the latest in SVN, revision 1543, works beautifully.
I'll post about png overlay soon, for now, here is the PET (324KB):
...compiled in Wary, but should work in all puppies.
Documentation on the utilities:
Comments:Posted on 18 Aug 2011, 16:10 by 01micko
problem with netpbm
Slacko Beta 1 uses this and there are reports of missing menu icons. I have confirmed this and that rolling back netpbm fixes it