How do i find out the DPI of a photo ?

i want to enter a photo in a 'contest' ... the rule is that the photo has to be at least 300 DPI ....
how do i determine what DPI my photo is ?
i have iPhoto 9.2.3
thank you
Donna

how do i find out the DPI of my photo ?
A digital image has no dpi, unless you print it. What is the pixel size of your photo? Select your photo in iPhoto and open the Info pane.
It will show you the width and height of your photo in pixel below the name of the camera; in the example above the image is 3000 pixels wide. Printed at 300 dpi it will be 10 inches wide. You need to know, how large the calendar is supposed to be printed, to see, if your photo has enough pixels.
How many pixels - width and height - does your photo have?

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How do i find out the DPI of a photo ?

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