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I want to design a flex banner of (90 Feet X 4 Feet) @ 72dpi. But i cant open a work book of such size in Illustrator. Can you please guide me on how to design the banner using the idea of a sizing the design in proportionality.

Thank you

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You have 2 issues here.

1) A real one. You need a 90 foot banner.

2) One that you asume. 72 ppi.*

The good news is that you are working in ilustrator.

You have 2 options to play with.

a) Scale your project down. Try making it at 1/10 try using 150-200ppi

b) Work in panels

You are asumming you need 72 ppi, which could be not the case. Take a look to this graph. Large Format Photograph Printing

Your project is a tricky one becouse you have a height of 4 foot, which leads me to thing that it is a sidewalk or something. That is why you can think of individual pannels. Lets say each pannel measures 8x4 foot. Then use that graph to think about the real resolution of the raster elements of each pannel.

If you choose to scale it down, the final raster elements will be scaled up again.

You don't need to worry about texts. Leave them on vectors.

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  • Regarding point a): assuming the OP has the 72dpi spec correct, Illustrator CS4 max artboard is about 220-something inches, which is about 19 feet. 19 feet is about 1/4 of 90 feet. So if the OP makes the artboard 19 feet wide @ 300 dpi, the effective resolution at 90 feet is about 72dpi. (increase the DPI (4x) by the same factor that the size has been decreased (1/4))
    – Yorik
    Sep 23 '15 at 17:18

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