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POPSPhoto Image Resolution: Avoiding Pixellation article ends with... In practice, images can often be reproduced at a lower resolution, especially on exhibition graphics, banners or posters where the viewer will not be especially close to the printed piece and therefore able to spot any pixellation. However, common sense will tell you than an image the size of a postage stamp cannot be enlarged to the size of a billboard!" I have proved this today, printing an A4 page of a photo of 250kb with 800 x600 pixels and it has come out pretty decent for most eyes, I would say, but that's an exception I reckon (good cameras, Sony, this was a 2.1 megapixel that I had years ago!)