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It's happened many times to photo buffs downloading free images from online stock sites: They find the right image, they follow the instructions, they download it successfully and ... it looks awful. If you download a free photo and it appears grainy or blurry when you go to use it, the image resolution is the likely culprit. Image resolution refers to the number of pixels the photo has in a given area. Because of how resolution works, a photo can look good in one location, but then change once it's transferred for use elsewhere.