I do photos of the stars and night sky with my Nikon d3100. I was wondering how to tell if my photos are going to be good enough of quality to print them on say, a 18-24 poster? I need good quality ...
Possible Duplicate: Is there a general formula for image size vs. print size? I have a wonderful photo from my cell phone and several people would like a 16x20 or at the least a 11x14 ...
What size images do I need for common print sizes, such as wallet size, 8x10, and 16x20? Is there a general formula? How could that size change if, for example, a 16x20 was printed on canvas rather ...