Can i create a 1mx1m poster using keynote??
I will hazard a guess that (1mx1m) means 1meter?
Keynote is not a good application to print from, there is no control over scaling in Keynote so a 50cm object will print much smaller than 50cm.
Use a graphics or page layout application that can scale to print correctly; Photoshop, Indesign, Pages, there are many others.
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