Image Sensor Size: What's the Difference? - Digital Photo Secrets: "Intermediate If you use a photo printing service, such as the one offered by your local drugstore, you may occasionally (maybe even frequently) get photos back that don’t look the same as they did when you shot them. I don’t just mean color and exposure (which can often be wrong when you use a commercial printing service), I mean decapitated heads, scenery that’s missing important elements and crops that just look, well, wrong. Why does this happen?"
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