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The Panasonic Lumix DMC-G2 by Carol F. Roullard, Brian Matsumoto Ph.D

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Revisiting Format and Pixels

The aspect ratio of an image is an expression of its height to its width with the two numbers separated by a colon. In the case of the Panasonic G2 camera, its nominal image array is 4000 by 3000 pixels, so its aspect ratio is expressed as 4:3. You can alter this ratio when recording an image by setting the aspect ratio to 3:2, 16:9, or 1:1. We deferred discussing this topic until now because creating pictures with a desired ratio is accomplished easily by working on an image transferred to a computer and using a program such as Adobe Photoshop or GIMP software.

Basically, you crop your subject to an aspect ratio that suits its composition and save it on your hard drive. This is so easily done after the image is recorded ...

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