If you really plan on just displaying every single bit of that town as a unique file, then I don''t know what point there is to using png. Png is good for things like a loaf of bread or a gold coin, something that needs to use a color key. This town obviously won''t so I would suggest jpeg. To do a test I took a 500kb bmp file and exported a 85% compresion jpg and it came out 11kb. Now I realize that comepresion rates vary based on percentages, but if I''m not mistaken this is a much better solution than png. I think just about any picture you have should compress to at least 50% with no noticable quality loss.