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DPChallenge Forums >> General Discussion >> Cool photo based optical illusion...
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06/12/2006 04:45:22 AM · #1
A very cool photo based optical illusion. Not seen one like this before, take a look...

Click Here
06/12/2006 04:47:52 AM · #2
I think I must have missed something. Looks like a negative of a black and white image to me, or is there more?
06/12/2006 04:49:28 AM · #3
That is pretty cool! The colors look proper and everything.
06/12/2006 04:58:09 AM · #4
That's weird, and very cool.
06/12/2006 05:05:56 AM · #5
Earlier this week, but still cool. :)
06/12/2006 05:55:12 AM · #6
Wow, that's so clever!

I'm going to share this around. Cheers!
06/12/2006 07:11:13 AM · #7
Outstanding, and VERY convincing!
06/12/2006 07:20:49 AM · #8
Originally posted by Jamester:

I think I must have missed something. Looks like a negative of a black and white image to me, or is there more?


Doesn't work for me either. The dot disappears from time to time though.
06/12/2006 07:31:05 AM · #9
Originally posted by Jamester:

I think I must have missed something. Looks like a negative of a black and white image to me, or is there more?


The instructions on the page are for you to (after looking at the picture for 30 seconds) move your mouse over the image. Then the color negative will turn to a color positive. Until you move your eyes that is - then you'll see that the image is really black and white and that your eyes were fooling you with an after image of the "color negative" you saw at first.
06/12/2006 07:38:59 AM · #10
Took another five tries but I think I see what you're seeing. It's only partially in color for a split second though. Maybe I'm just too tired.
06/12/2006 08:21:57 AM · #11
There might be some individual differences in the visual cortex and pathway's ability to retain the negative image. It only took one try for me and the effect was very vivid. There may also be a suggestibility component too. I had seen some similar visual exercises before so I was prepared for it.
06/12/2006 08:24:22 AM · #12
oh wow that's crazy. It's not just a little bit of distorted color like I imagined it would be -- it's like real, vivid, no joke about it a color photograph. Until you move your eyes...that's really cool.
06/12/2006 09:01:30 AM · #13
I just did it again too, and this time I forced my eyes to stay on the dot after the mouse-over and the image retained its color for as long as I could will my eyes not to move - about 45 seconds. It's really quite an impressive demonstration of the same effect seen in the United States Flag optical illusion frequently seen around the 'net.

Any visual experts around who can explain how the eye/brain retains the image??
06/12/2006 09:36:20 AM · #14
Originally posted by strangeghost:

Any visual experts around who can explain how the eye/brain retains the image??


Expert, no. But I do know roughly how it works. After staring at the negative, your visual system retains an "afterimage" that is essentially a color negative of the "burned-in" image. So a negative of a negative is a positive. Now, when you look at the grayscale image, the color positive afterimage tints the luminosity information provided by the grayscale image. The illusion is broken when yoiu move your eyes and the afterimage is no longer lined up with the grayscale photo.
06/12/2006 09:55:53 AM · #15
Great explanation Kirbic! At the level of the biochemistry, I wonder if the rods and cones continue to "fire" after the image is taken away or if it's something in the neural pathways that "retains" the image. Any ophthalmologists or neurophysiologists out there??

Originally posted by kirbic:


Expert, no. But I do know roughly how it works. After staring at the negative, your visual system retains an "afterimage" that is essentially a color negative of the "burned-in" image. So a negative of a negative is a positive. Now, when you look at the grayscale image, the color positive afterimage tints the luminosity information provided by the grayscale image. The illusion is broken when yoiu move your eyes and the afterimage is no longer lined up with the grayscale photo.
06/12/2006 09:57:46 AM · #16
Originally posted by strangeghost:

I just did it again too, and this time I forced my eyes to stay on the dot after the mouse-over and the image retained its color for as long as I could will my eyes not to move - about 45 seconds.


That's what amazes me too. It seems almost indefinite (well, the most for me is about 30 seconds) ... as if it could last forever, except that after awhile I just can't help it - I move my eyes! (must work on that will power thing)

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