Deepblue : What I’ve found so far is .jpg at 300 dpi with some compression to make it managable is best. I’m not fond of .TIFF 'cause its somewhat variable and many times the file is just huge without any noticable increase in quality. So far, and I’m new at this too, I’ve found that with these large printouts you can compress things pretty much without it being noticeable.
24lb coated paper is the heaviest I have now. And, until this is set in stone, maybe we should stick to the less expensive 24lb.
Imperious : To get higher dpi than the original, the map needs to be opened with Photoshop Pro and re-rendered at a higher dpi. { And this may or may not help. } I -think- this will only help the text and effects, but I don’t know. That initial image that this all started with doesn’t have all that much resolution. 100 dpi. at something like 32 inches. It still printed fine for a playable gameboard. My PC is somewhat weak and can’t increase the dpi on this layout its too big for its memory.
Wrapping any bit image in some other file format will not make it scalable. Once its a bit image, your bits are set. Bigger images only give bigger bits. Some things do a better job at smoothing these bits than other things.
Why do many .pdf files print so well? Becuse they are usually vector images with mixed in very high resolution bit images. And vector images -are- scalable.
I hope this helps…
-jim lee