I'm designing some backdrops for a play using Illustrator, the printed dimensions are 18m x 11m.
What size should I make the document so that it looks clear but isn't a huge file size?
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Illustrator is a vector editor, which means there is not limit to how much it can be scaled. Therefore, you can, in theory, design it at 1/1000000th of the ratio and then just export it at desired size.
That is a bit of an extreme example, but you can design it at a significantly smaller size and then export it to desired size (just make sure to get the Ratio properly 18 x 11).
I, personally, would design it at 1800 x 1100 pts (only because that is the size I'm used to on my computer)
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