It is a guideline which applies to the process of composing visual images. It is used in photography, paintings and etc. It is applied by aligning a subject with the guide lines and their intersection points, placing the horizon on the top or bottom line, or allowing linear features in the image to flow from section to section. The main reason for observing the rule of thirds is to discourage placement of the subject at the center, or prevent a horizon from appearing to divide the picture in half.
This is one of the most useful composition techniques in photography. It's an important concept to learn as it can be used in all types of photography to produce images which are more engaging and better balanced.
In the picture below, this is the Rule of Thirds:
When framing a photo, imagine the scene divided up as above. Think about what elements of the photo are most important, and try to position them at or near the lines and intersections of the grid.They don't have to be perfectly lined up as long as they're close. You may need to move around to get the best composition. This forces you to think more carefully about the shot, and is a good habit to get into whether you're using the rule of thirds or not. To help you out, some cameras have a setting which overlays a rule of thirds grid onto your photo. This removes all guesswork and helps you get your positioning even more accurate.
This is the examples:
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ORIGINAL PICTURE |
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WITH "RULE OF THIRDS" |
http://www.photographymad.com/pages/view/rule-of-thirds
http://en.wikipedia.org/wiki/Rule_of_thirds
http://en.wikipedia.org/wiki/Rule_of_thirds