Quote:
Originally Posted by jmarsh24
What size should I make it in illustrator?
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It shouldn't really matter. As long as your aspect ratio matches that of the flag, the print shop can scale it up/down and print it (some large printing devices actually use a vector format natively, so the print shop will have to transform it to vector anyway).
If you have to use raster graphics (including a photograph on your flag or something like that), then definitely use png. jpg artifacting is really ugly and nasty, especially at large sizes. As a rule of thumb, anything that has blocks of solid colour (Craig's example of text is a good one) is something you _never_ want to use jpg for. png handles blocks of colour much better and also works well for photos.