Re: FREE canvas! (guaranteed NOT to be SPAM)
the canvas itself will take away artifacts because of the texture, 6mp should be just fine. I would probably say it's safe to do 125~150 dpi on canvas for a good quality print, and even 75 dpi for a reasonable one. Mostly if you up size it and do sharpening algorithms.
Res Chart I'm referencing says a 30x20 is okay standard print, with canvas you should be just fine.
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