Cool optical illusions with color!

klah

Diamond Member
Aug 13, 2002
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This is why I only trust computers...


Originally posted by: newnameman
For number 3, both of the cross pieces look like grey to me :confused:
Have you taken a Ishihara test?

 

EyeMNathan

Banned
Feb 15, 2004
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Same. The first two were old but the third one is the most extreme illusion I've seen in a while.

I saw another one recently where it had a green (i think) dot in the middle of a circle of purple dots which would come on one at a time in a rotating pattern.

The freaky part was, if you focused on the green dot, and werent a mile from your monitor, the purple rotating dot would disappear.
 

newnameman

Platinum Member
Nov 20, 2002
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Originally posted by: klah
This is why I only trust computers...


Originally posted by: newnameman
For number 3, both of the cross pieces look like grey to me :confused:
Have you taken a Ishihara test?
Yeah, and I passed those just fine. But I still don't see the yellow. :(
 

mobobuff

Lifer
Apr 5, 2004
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Originally posted by: EyeMNathan
Same. The first two were old but the third one is the most extreme illusion I've seen in a while.

I saw another one recently where it had a green (i think) dot in the middle of a circle of purple dots which would come on one at a time in a rotating pattern.

The freaky part was, if you focused on the green dot, and werent a mile from your monitor, the purple rotating dot would disappear.

Each human eye has a blindspot. It's about 3/4" in diameter when projected on an object 15" away from your face. When both eyes are open, each blindspot is filled because one eye can see what the other can't. Look at a pattern on wallpaper or something and close one eye and try to look for it. It's easier if you open MS Paint, put down two large (40p x 40p) black dots opposite each other about 1/4th of your screen apart. Close your right eye and focus on the right dot with your left, move steadily farther and farther away until the left dot disappears. Start at about 3 inches away. If you try to actually focus on it, it'll move, so don't stop focusing directly on the right dot.

That 3rd illusion is wicked! I'm amusing it's because the brain tries to extract the true nature of the color because it senses that it is lying behind a transparent filter, the brain tries to adjust it accordingly but fails to remain accurate.
 

mobobuff

Lifer
Apr 5, 2004
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Originally posted by: EyeMNathan
http://www.i-am-bored.com/bored_link.cfm?link_id=11084

Found the illusion, but I remembered it wrong. Its far more trippy than I remembered.

<Neo> Whoa </Neo> :Q

That has nothing to do with blindspots, nevermind what I said. It's another color illusion, brain tries to save computing power and just assumes that everything stationary outside the cross is grey, especially because the dots don't contrast, they have a soft fade. What's neat about this is you can see the color assumptions of the brain take place in motion, and how long it takes. Mine removes the dots in about a half second, from bottom to top.
 

mobobuff

Lifer
Apr 5, 2004
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Oh wait I just noticed that they tend to disappear after they turn green. Kinda like the green dot is an eraser. Very cool.
 

EyeMNathan

Banned
Feb 15, 2004
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Depending on your level of concentration and distance from the monitor you should see a rotating green dot even after they are all gone. But optical illusions vary from person to person.
 

mobobuff

Lifer
Apr 5, 2004
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Oh yeah I can see the green dot after they're gone, there's nothing but the cross and the circling green dot, and I just now noticed that it's not even green. This illusion is mocking me!
 

neutralizer

Lifer
Oct 4, 2001
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Originally posted by: EyeMNathan
Depending on your level of concentration and distance from the monitor you should see a rotating green dot even after they are all gone. But optical illusions vary from person to person.

The pink dots didn't disappear for me, but the green dots were going all over the place.
 

mobobuff

Lifer
Apr 5, 2004
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Well the inverse of hot pink is lime green, your eyes make up for a sudden lack of the hot pink with a lime green, something to do with the color vision receptors, the cone ones, fatigue and bla bla bla. But the kicker is that you don't even perceive the pink after a while but the dot stays green!
 

Azndude51

Platinum Member
Sep 26, 2004
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Wow, my eyes must be messed up because on the third one, the left one still looks gray and the right one still looks yellow after I apply the mask. The circling dot one works for me though.