Thanks I have another question. I wanted to create a magazine cover type layout at 16x20 300 ppi. The picture I have is 1200x1600 6.667x8.889 inches at 180 ppi BUT when I put it on a 300ppi 16x20 inch canvas the very same picture goes down to 4x5.33 inches.

I tried stretching the photo but it began to look washed out so to speak.

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ETA Pesto I just read the article you posted about sampling up...I guess I can't do what I wanted to do eh?