Sorry Mike,
I'm outside of France and I didn't connect internet so I couldn't see your message !
Yes, I done Mars & Saturn in RGB:
http://img6.imageshack.us/img6/3917/saturne1.png
http://img710.imageshack.us/img710/7127/saturne2.png
http://img251.imageshack.us/img251/3647/saturne3.png
But I don't know how to do the processing !
Franck