Photo Resolution: The quality of the canvas print is directly proportional with the resolution of your Photo to canvas and photo on canvas . Generally you shouldn't submit a photo that has less than 250KB, as it may appear 'pixelated', even on a 10x10cm print. When choosing an online canvas shop make sure that their website has a photo checking tool, once you upload your photo the tool tells you whether the resolution of your photo is suitable for the canvas size you selected. If you know the dimensions of your photo (most Mac and Windows systems show this info in the photo properties box) you can determine the resulting print resolution by dividing the number of pixels your photo has by the number of inches the canvas print size selected by you has. For example if your photo has 5000 pixels horizontally, and you want a print that has a width of 50 centimeters, the resulting print will have around 5000pixels/20inches=250DPI horizontal resolution. The same calculation applies to vertical resolution. A print that has at least 250DPI, on canvas, is a fairly good looking print. The calculation above represents the true resolution, however the professional printers using various software can 'enreach' photos that have lower resolution, there are several algorithms that actually enlarge a photo and increase the resolution at the same time by artificially creating pixels, the resulting print however may present patterns like minor squares or circles.