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Old 07-16-2010, 04:20 PM   #16
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This may be it.

Spoiler:
The center is not really a circle
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Old 07-16-2010, 06:06 PM   #17
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Originally Posted by poohbear_nc View Post
Has ANYONE figured this one out yet?

Maybe there's NO answer?
Trouble is there seem to be lots of answers!
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Old 07-17-2010, 08:51 AM   #18
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Originally Posted by poohbear_nc View Post
Has ANYONE figured this one out yet?
There have been several plausible solutions posted. Presumably, when PDurrant gets back from his weekend away, he'll tell us which is correct.
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Old 07-18-2010, 07:43 AM   #19
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Looking forward to when pdurrant can let us know if any of us have it right.
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Old 07-19-2010, 08:24 AM   #20
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Quote:
Originally Posted by TGS View Post
Maybe it's this:
Spoiler:
What appear to be green and blue spirals are actually spirals of the same colour - the effect is achieved by the different coloured fine lines that cross the spirals. Our brain wants to see these fine lines as the same colour but in order to do so it has to see the spirals as different colours.
Yes, well done TGS.
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Old 07-19-2010, 08:25 AM   #21
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Quote:
Originally Posted by clarknova View Post
Spoiler:

The only thing I see is the funky color blending.
It looks like the only actual colors in the spiral are cyan, magenta, and orange, but the overall effect gives the appearance of blue, red, and green.
Yes, well done.
Spoiler:
Although I'm not sure it's right to call it colour blending.
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Old 07-19-2010, 08:27 AM   #22
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Quote:
Originally Posted by Mike L View Post
For what it's worth:

Spoiler:
I don't understand why, but there are not as many colours as first appears. In fact, the blue and the green are apparantly the same colour.

To demonstrate, I copied the image into a graphics editor, and used the color picker tool to get the underlying colour values. For both the green and the blue, it showed up as RGB(0,255,150). That colour normally renders as a very bright green.

Somehow the interaction of the blue/green with the neighbouring colours is causing the effect. But, as I said, I don't really understand it.
Yes, well done. I suspect many people won't believe the answer until they do the same.
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Old 07-19-2010, 08:27 AM   #23
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Quote:
Originally Posted by GeoffC View Post
Spoiler:

It's an illusion/impression formed by colours mixing/interference.
Not quite enough detail in your answer to tell if you've got the right answer or not.
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Old 07-19-2010, 08:42 AM   #24
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Quote:
Originally Posted by pdurrant View Post
What's the optical illusion demonstrated by this image? I'm not looking for a technical name, just a description of what you can see in this image that isn't true.
What I expect you see in the image are quite broad green and blue spirals going clockwise out from the centre on a background of very thin pink/purple spirals going counter-clockwise out from the centre.

So what's the illusion?

Spoiler:
The 'green' and the 'blue' bits of the broad clockwise spirals are exactly the same colour. There are only three colours present in the image. Well, the first image has anti-aliasing between the colours, so there are more than three colours at the boundaries, but the second image has no anti-aliasing, and has pixels of just three different values. The thin spirals are 0xFF00FF and 0xFF9900, and the 'green' and 'blue' spirals are both #00FF99.

I find this illusion to be very robust. Even zooming in on the spirals in an image editing program, the 'green' and 'blue' remain for me. (See attached detail image.)

If I try to get a solid colours equivalent to the apparent colours, I get (roughly speaking) 0x99FF4F (green) and 0x5FCFFF (blue). I've added patches of these solid colours just for comparison purposes. They're not quite right, but they're close. I suspect that for different people they might be closer or further from the apparent colours.

Attached Thumbnails
Click image for larger version Name: spiraldetail.png Views: 181 Size: 11.6 KB ID: 55445   Click image for larger version Name: Green.png Views: 194 Size: 676 Bytes ID: 55464   Click image for larger version Name: Blue.png Views: 177 Size: 676 Bytes ID: 55465  
Last edited by pdurrant; 07-19-2010 at 05:01 PM. Reason: Added solid colour images
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Old 07-21-2010, 11:52 AM   #25
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The next puzzle is now available here: https://www.mobileread.com/forums/showthread.php?t=91603
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Old 07-21-2010, 03:51 PM   #26
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Originally Posted by pdurrant View Post
The next puzzle is now available here: https://www.mobileread.com/forums/showthread.php?t=91603
Oh, no. Another lost weekend.
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