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AuthorTopic: Hoax?
Law Bringer
Member # 335
Profile Homepage #25
Magic, of course.

—Alorael, who has found that magic eyes are much easier to see when you're extremely tired. There's nothing like being unable to focus your eyes to make you, well, unfocus your eyes.
Posts: 14579 | Registered: Saturday, December 1 2001 08:00
Member # 5310
Profile #26
I can see them!!!!
Posts: 57 | Registered: Monday, December 20 2004 08:00
Member # 7538
Profile Homepage #27
I've seen them before, but only after looking at the answer. So I guess I cheated. I don't have the patience for such things though, so normally I don't try.

Do not provoke the turtles.
They do not like being provoked.


My website: Nemesis' Refuge
Posts: 743 | Registered: Friday, September 29 2006 07:00
Member # 5483
Profile #28
Well, I guess so far I'm the only one who can only see them concave. I wonder what causes that anyway?

Ignorance Is bliss -Cypher (Matrix)
Don't think you can; know you can -Morpheus (Matrix)

sanity is overrated :)
Posts: 130 | Registered: Monday, February 7 2005 08:00
Skip to My Lou
Member # 40
Profile Homepage #29
You're not the only one, as 10 other people, including myself, said that we can it them both ways. As to how it works, it's explained in the link Alo gave to autostereograms.

More simply though, if I'm getting this right, in the regular use of your eyes you see two images, the one from your left eye and the one from your right eye. Normally, your eyes are angled such that the two images perfectly overlap so that it seems you are only recieving one image. However, the combination of two images coming from slightly different angles adds a perception of depth.

Magic eye images are made specially made of repeating patterns so that they can overlap in more ways than just the regular way. You see them concave when you cross your eyes slightly >< causing the angle from which you are getting your left image to move further right and your right image to move further left. You see them convex when you shift the angles the other way <>. Magic eye images are designed so that there is an image that is split up into bits and shifting the angle you view it puts the bits back together. Since the magic eye images are designed for the <> method to make them pop towards you, doing the opposite causes them to pop away from you.

An example anyone can do is to hold up one finger directly in front of your face at arms length and hold up one finger on your other hand at about 8 inches from your face. When you are focused on the near finger, out of focus in the background, your other finger appears to have split into the two separate images. The trick is to keep the focus and angle of your eyes on the near finger even when looking at the far one.

Take the Personality Test!
Deep down, you wish you were a stick figure.
Posts: 1629 | Registered: Wednesday, October 3 2001 07:00
Member # 2820
Profile #30
I believe retinal disparity is the term for the process that the Magic Eye style images take advantage of in order to create that effect. When objects are close to you, like under 5 feet, the differences between the images of the object sent to the brain by either retina are great enough to be noticeable. The brain then interprets these differences to determine the distance between you and the object.

Retinal disparity is also used to refer to the measure of difference between those retinal images from either eye. Since this disparity decreases dramatically over distance to the point where the brain cannot detect the differences, the brain uses other methods to judge distance when the objects are further away.

Magic Eye software interpolates two images, each taken from different positions to mimic the fact that there is a distance between your eyes. When you cross your eyes in the right way, one eye will see the original image of one camera while the other will see that of the other camera. Then the brain will interpret these as a three dimensional image. The other major key to this is that the software must ensure that there are enough similarities between what the each eye sees so that the brain will interpret the content of the different images sent to it from each eye as the same object.

EDIT: Because retinal disparity is not used for the perception of large distances, Magic Eye images have a practical limit of depth. In a general analogy, if you cannot construct the desired effect on a cardboard stand in real life, then a Magic Eye image cannot emulate such an effect.

[ Friday, December 15, 2006 15:18: Message edited by: Garrison ]

Thuryl: I mean, most of us don't go around consuming our own bodily fluids, no matter how delicious they are.
Alorael: War and violence would end if we all had each other's babies!
Drakefyre: Those are hideous mangos.
Posts: 1415 | Registered: Thursday, March 27 2003 08:00