Conform picture to 8x12 format

I've used some of the PHP image functions and have been quite impressed.  I was wondering if it could help me with this project.  I have .jpg files all of different sizes and proportions.  I need to print them all on 8x12 prints.  What I have been doing is using my calculator and enlarging the canvas and adding black bars where space needs to be filled, so that it fulfills the 8x12 ratio.

I can't help but think this could be done programatically using PHP.
hrolsonsAsked:
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Beverley PortlockCommented:
If you can work out the pixel size then you can use the image resize routine in the question below to ensure that your resized image fits within the pixel sizes for your image

http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_24935011.html#25924977

Adding the borders would be a matter of calculationg two rectangles in the appropriate places and filling them with black (or white)

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