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POPSThe Myth that Image DPI Is Relevant To Web Images The source site, emdpi.com, seems to be a great site for clearing up common misconceptions about basic graphics terminology and definitions. For example, it also mentions that the "em" is -not- "a square the size of the letter M" (I'd seen that one before), and explains that in Windows, an inch as defined by Microsoft might not be an actual physical inch - and why.