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Stupid question: where does the illusion of 3D come from?

Started Jan 13, 2015 | Questions thread
Sailor Blue
Sailor Blue Forum Pro • Posts: 15,536
Re: Stupid question: where does the illusion of 3D come from?

Sit in front of a big window and take a photo of someone looking right at the camera.  The light is even all across the face than the face will have a flat appearance in the photo.

Now move off about 45º to the side and have the subject turn their face about 35º toward you then turn just their eyes to the lens and take a photo.  The face will now have a side that is directly lit by the window light and a side that only has indirect light on it, the face will have highlights and shadows and take on a 3D appearance in your photo.

Want to make your jelly fish image look even more 3D?  Take the lens out of one side of an old pair of sunglasses, put the sunglasses on, and look at the image.  Now try that with TV.

You are fooling the brain with the different amounts of light to each eye for the same subject and it processes the visual information to give the flat image a nice 3D appearance.  Don't leave the glasses on very long or the brain gets used to what you are doing and the 3D appearance goes away.

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