Cool, that sounds good.

O.k. another test with Google's Zopfli, in case people
don't like jpeg...

Same image with Photoshop as .png = 736.661 Byte
then pngcrush = 660.358 Byte
and pngcrushed image used with Zopfli = 631.517 Byte

Source Code: https://github.com/google/zopfli

Regards
Stefan