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Please note that the following is just a speculation and may not necessarily solve the problem....
Let's say that image#1 (48x72) is your 4x6inch photo (384x576 pixels). Because the photo is higher and narrower than a standard screen size, the unaltered photo would become distorted when put onto an 800x600 screen (image#2).
Image#2 is the exact same image as #1 but uses the height and width specs of 80x60 to show how the unaltered photo would look on an 800x600 screen.
3 4 5
Of course you want your photo to be undistorted, so you will take a portion (that has the same proportions of the screen you want it to fit) of the original photo (image #3) to arrive at image #4 (48x36) to prevent the distortion on the monitor with screen settings of 800x600. Image#5 is the exact same image as #4 but uses the height and width specs of 80x60 and shows how the photo would look on an 800x600 screen.
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