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> Your are mixing up two different Stereograms systems.
> 1. "magic eye pictures"
> For this you must stare at the picture, that will say you look behind
the
> picture.
> If you wait, your eyes look at different pictures. Your right eye
takes an
> object
> to the right of that of your left eye. Your brain makes a 3D image off
these
> slightly different pictures.
> Exaggerated this is what you do:
>
> Left |
Right
> Object |
Object
> Position | Position
> Left eye | Right eye
>
> If the left and right object are placed in the same orientation (not
rotated
> to
> each other), then your left eye sees the right side of the object a
bit and
> your
> right eye sees the left side of the object a bit.
> This is just the wrong way around. Your right eye should see a bit of
the
> right
> side of the object and your left eye a bit from the left side.
>
> 2. Crossing eye method.
> By crossing your eyes you look before the picture and your left eye
now
> looks at the right object and your right eye looks at the left object.
> Exaggerated this is what you do:
> Left |
Right
> Object |
Object
> Position | Position
> Right eye | Left eye
>
> This is precisely what a 3D picture should be.
> Now you can understand that the "magic eye pictures" were flipped
> forward - backwards. Your eyes saw the wrong side of the object.
I'm no expert by any means, but the "random dot sterograms" you see feature
repeating sections of random dots. If you cross your eyes so that the
repertitions line up on top of each other, your brain interprets the repeat
length as 3D depth. Amazingly, you can do this with text too:
00300000300000300000300000300000300000300000300000300
12345612345612345612345612345612345612345612345612345
12345612345612345612345612345612345612345612345612345
12345612346123461234561234512345123456123456123456123
12345612346123456134561234512345612456123456123456123
12345612346123461234561234512345123456123456123456123
12345612346123456123456123461234562345612345612345612
12345612346123456123456123461234561345612345612345612
12345612346123456123456123461234561345612345612345612
12345612345612345612345612345612345612345612345612345
12345612345612345612345612345612345612345612345612345
00300000300000300000300000300000300000300000300000300
Be careful not to "over converge", but you should be able to make out the
letters "PR". (It helps if you view it with a fixed-width font!) By skipping
or adding dots (or in this case digits) you can change the 3D depth. Anyway,
my images use normal effects of perspective to change the rate at which the
pattern repeats, that's all. (Getting a high-contrast random-ish texture
makes it work best.)
Of course, you can "cross" your eyes in two directions - you can make them
more parrallel then they should be by rotating them away from each other (as
if looking "behind" the image), or make them too diagonal by rotating them
towards each other (as if looking "in front of" the image). I myself am
quite good at doing the latter, but not so good at doing the former. If I
could do the former, the first uncorrected image I did would presumable look
correct.
> > PS. Can anyone here see sterograms btw? Kinda pointless if you can't :P
>
> I've made even videos for the crossing eye method and can now look at
> them for hours without effort. Indoctrination of the brain works!!
Mmm... I'm thinking animation 8-) Of course, question is, can you get your
eyes to converge right before the animation is over? lol
> Greetings,
>
> Jaap Frank
>
> PS: I've attached an example. This is a part of a hemoglobine protein
chain.
> Happy crossing your eyes.
Oooo dear me... I have to shrink the image down several times before I can
cross my eyes far enough... hehehe
Thanks.
Andrew.
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