The easiest way to describe this, is by comparing Blu-Ray DVDs with VHS Tapes. When you view one then the other, there really is no comparison. We print using the highest resolution settings and to get the best results we need your photos/images to be of the highest quality also. To get a good quality image to print perfectly, it must be at least 300dpi at the size it is to be printed. Any less could result in pixelation as the image below shows