Okay, I've included 2 screen shots of Photoshops Image Size Dialogue below
Notice the top zone is labelled "pixel dimensions" and the bottom is labelled "document size". Notice how in both screen shots, the pixel dimensions are the same, yet the document sizes below are different? The kicker here is (and what confuses soooo many people) is that the actual image on screen has not changed in either case. Why is that? Because when an image is on screen, or in your digital camera, it has NO physical dimensions. When you choose an "image size" in your DSLR, you choose it based on pixel dimensions. If I want to shoot at high quality with a D2x, I select 4288 x 2848 pixels in the menu, not "12 x 15 @ 300 ppi". The camera has no concept, nor does your monitor, how many "inches" it has. It's only on output that you need to concern yourself with "inches". You monitor is simply trying to display pixels values in a 1:1 relationship as they're described in the file and it will do so as accurately as it can based on the display technology (CRT vs LCD).
Don't believe me, read here and here and here (there's hundreds more):
http://photo.net/bboard/q-and-a-fetch-msg?msg_id=00LDT4
http://www.nicholsonprints.com/Articles/dpi.htm
http://www.scantips.com/no72dpi.html
http://www.technicallyeasy.net/2007/...eb-images.html
http://www.just-stuart.com/photogs/DPI_Confusion
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