Aspect Ratio adjustments explained

I can’t tell you the number of times I’ve gone to print pictures I’ve taken only to find that I had composed it in a way that a portion of the image was lost when printed because it had to be cropped out to fit on the paper.  Today I am going to share a technique in Photoshop that will help you get around that pesky limitation.

First a little background – the reason why we are losing part of the picture is because we are changing the aspect ratio.  What is aspect ratio?  Simply enough, it’s the relative size of the long side of the picture to the short side.  Aspect ratios are often referred to by their lowest common factor.  So, a 4×6 print uses a 3:2 aspect ratio.  (Aspect ratios usually are stated with the larger of the numbers coming first…)  An 8×10 has an aspect ratio of 5:4.  Want to print a 16×20?  Guess what – it’s got an aspect ratio of 5:4 too!  Here are some of the most common aspect ratios that you see in photography:

4:3 – Point and Shoot Cameras
3:2 – 35mm Film cameras and most APS-C sensor cameras (SLR’s)
1.81:1 – APS-H Mode (High Def)
3:1 – APS-P (Panoramic)

So, with an SLR camera, since your sensor approximates an aspect ratio of 3:2, getting an 8×10 print means you need to keep your subject matter in from the edges because when you crop to the new ratio, at least one of those edges (and a little of the other) will be lost from the crop.  So, having now explained  “why”, let’s now look at the “how” (as in how to fix it!) in the delayed tutorial for the week:

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