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Is there a tool that can determine the file type from containing data?

How do I find out the format of a picture on windows 7? If i right click on the picture and check the properties, it just gives me the dimensions, but not the picture format. Is there any tool to find that out?

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If the file extension isn't enough to tell you, then use the method in Is there a tool that can determine the file type from containing data. Usually the extension (.jpg, .png, etc.) should be enough though. – nhinkle♦ Apr 26 '11 at 6:55
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closed as exact duplicate by nhinkle♦ Apr 26 '11 at 6:55

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ImageMagick's identify can recognize may image formats, and even present some details about the file.

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