[Image-SIG] Converting 32Bit png to 8Bit png

[pirmin.moesle at alpstein.de]

Hi guys,
 
I'm currently using pngnq (pngnq.sourceforge.net/) for postprocessing my pngs - converting the 32Bit RGBA pngs to 8Bit pngs.
 
Is there a way using PIL to prevent myself from the postprocessing job.
 
I do exactly need 2 ways of processing:
 
a) Convert the 32Bit RGBA png to a 8Bit RGB palette png
a) Convert the 32Bit RGBA png to a 8Bit RGBA palette png
 
Quite a lot research didn't answered my question. Hopefully I get some ideas here.
 
Thanks in advance.