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how to ristrict image only to 300dpi

is there a way to restrict the upload of an image to 300dpi only? ?

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PHP

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@NogDogDec 21.2006 — To the best of my knowledge, "dpi" is an attribute of the display device (computer/monitor or a printer), not of the image file. All I would know how to check for is the dimensions of the image file in pixels (such as can be done with the [url=http://www.php.net/getimagesize]getimagesize() function[/url]).
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