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Sizing a new document for a large poster

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My question is a long the lines of the first post, with the exception that I am creating a 20x30 composite poster with an image as background, a baby picture smaller and blended in, and text.  In the past, I opened a new document as a 20x30 and placed the embedded images and added text.  Then output as a jpeg 10 or 8, but the PSD files were huge!  Will it work just as well to open a new document as a 10x15 and for output crop as a 20x30?  Thank you.

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No, because you are presumably putting the resolution in when you open the new document.  So going from the smaller to the larger doc would require upsizing, and a resultant loss of quality.  So I would start with the size you intend to print.

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