don't confuse DPI with pixels/inch. Most color printers will print a photo quality picture at 300 pixels/inch.
Remember it take one of each of a CYMK dot to defined each pixel. That means you get 4 or more ink dots per pixel plus some white space.
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Andrew in Austin
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Sony DVP-S530D DVD Player
Sony STR-DA333ES A/V Receiver
Sony KP-57XBR10W Rear Projection TV (16:9)
Infintiy SM 120 (L & R)
Infinity SM Video (center)
Infinity SM 165 (surround)
Infinity BU-120 (subwoofer)
if you're using photoshop you can change the measure to inches, then just measure the case, and change it back to pixels to get the pixel size.. I'd do it but I'm at work with no cases