Any photographer who does more than snapshots will have ever wondered (but in the photo it does), how it will look at your photo. To try to find an answer to that question is lots of composition rules that help direct the viewer's gaze, being in the hands of a good photographer choosing which is the first thing is to see and where we are going to turn our gaze to below.

But any rule of composition is only theory that can work, or not. However it is possible to find out exactly how each person looks at a picture.

Probably the best known composition rule is known as the rule of thirds, which adopts the point of interest must lie at the intersection of lines dividing the frame into thirds horizontally and vertically. It's just a simplification of the Golden Ratio. Another well-known is the one that says that a moving subject must have free space in the direction towards which it moves and not the opposite.

They are the only ones, there are many rules that can be used alone or in combination, and even breaking them voluntarily seeking greater impact. However, no guarantee that the result is expected.

At the end of every photographer should try to make the picture look just like the thought, starting at a point, running the image through its elements to the point of interest, and stopping at the. When not available, the impact of the photo is reduced and decreases its appeal.

But figuring out how a picture is really not an easy task. Not worth notice as you see yourself, it is a totally biased opinion. Nor does much to ask someone as he has seen. Certainly the comments of a photographer not to be too vague and imprecise, since not familiar with the composition of us will not know the answers we seek. So how can we find out?

Eye Tracking

Recently in my work, I have had occasion to use a few days a team of eye tracking and Eye Tracking . They are specially trained monitors to record that part of the screen is looking exactly the user, which are used primarily in research, marketing and usability studies.

For the preliminary tests in the beginning to learn to operate the equipment I used some of my photos as shown, and office mates as subjects of study . Are obviously loose data are of no use, but give us an idea of how a particular person is actually a particular photo.

In the following video you can see some of the photos used with lines and red dots overlays that reflect where you looked. The lines are eye movements during which the brain fails to process any image. The points are the pauses in which the image if it is perceived. The longer the pause, the bigger it makes the point.