Comments on: Optical Illusion – Shades of Difference http://www.neatorama.com/2009/10/05/optical-illusion-shades-of-difference/ The Neat Side of the Web Thu, 16 Feb 2012 16:46:58 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Ali S. http://www.neatorama.com/2009/10/05/optical-illusion-shades-of-difference/comment-page-1/#comment-1867699 Ali S. Thu, 08 Oct 2009 22:56:52 +0000 http://www.neatorama.com/?p=26707#comment-1867699 I still think this is witchcraft! I still think this is witchcraft!

]]> By: Lady Helena Handbasket http://www.neatorama.com/2009/10/05/optical-illusion-shades-of-difference/comment-page-1/#comment-1867276 Lady Helena Handbasket Wed, 07 Oct 2009 12:41:33 +0000 http://www.neatorama.com/?p=26707#comment-1867276 You are right, I was wrong. I found an instructables page showing how to make it: http://www.instructables.com/id/Shady-Optical-Illusion/ You are right, I was wrong. I found an instructables page showing how to make it:
http://www.instructables.com/id/Shady-Optical-Illusion/

]]> By: Foreigner1 http://www.neatorama.com/2009/10/05/optical-illusion-shades-of-difference/comment-page-1/#comment-1867264 Foreigner1 Wed, 07 Oct 2009 11:03:23 +0000 http://www.neatorama.com/?p=26707#comment-1867264 This one is not based on the Cornsweet-principle. This is just graduations like I had to make when I had to learn to mix colours in paint-restauring class. This one is not based on the Cornsweet-principle. This is just graduations like I had to make when I had to learn to mix colours in paint-restauring class.

]]> By: Lady Helena Handbasket http://www.neatorama.com/2009/10/05/optical-illusion-shades-of-difference/comment-page-1/#comment-1867233 Lady Helena Handbasket Wed, 07 Oct 2009 07:28:25 +0000 http://www.neatorama.com/?p=26707#comment-1867233 I assure you they are the same. I have found the wikipedia article which explains it: http://en.wikipedia.org/wiki/Cornsweet_illusion I assure you they are the same. I have found the wikipedia article which explains it:
http://en.wikipedia.org/wiki/Cornsweet_illusion

]]> By: Foreigner1 http://www.neatorama.com/2009/10/05/optical-illusion-shades-of-difference/comment-page-1/#comment-1867091 Foreigner1 Tue, 06 Oct 2009 16:54:48 +0000 http://www.neatorama.com/?p=26707#comment-1867091 Dear lady, The same colour is not present. Would it be the same colour, you would be able to take out the 2 middle colours and see no difference. The minimal difference in colous causes the brain to perceive the difference that is there as a difference in light or shadow. Therein lies the illusion. Dear lady,
The same colour is not present. Would it be the same colour, you would be able to take out the 2 middle colours and see no difference. The minimal difference in colous causes the brain to perceive the difference that is there as a difference in light or shadow. Therein lies the illusion.

]]> By: Lady Helena Handbasket http://www.neatorama.com/2009/10/05/optical-illusion-shades-of-difference/comment-page-1/#comment-1866965 Lady Helena Handbasket Tue, 06 Oct 2009 13:04:34 +0000 http://www.neatorama.com/?p=26707#comment-1866965 Damn, ascii art didnt work at all. Sorry Damn, ascii art didnt work at all. Sorry

]]> By: Lady Helena Handbasket http://www.neatorama.com/2009/10/05/optical-illusion-shades-of-difference/comment-page-1/#comment-1866964 Lady Helena Handbasket Tue, 06 Oct 2009 13:03:34 +0000 http://www.neatorama.com/?p=26707#comment-1866964 AlejoHauser, the same colour IS present on both sides. The only variation in colour (actually intensity) is present at the lines. Lemme see if I can do an ascii art illustration... ¦\ _________________ ¦ \________________________ \ ¦ \¦ If you cover the area where the intensity changes it destroys the illusion that the colour is different on both sides of the line. AlejoHauser, the same colour IS present on both sides. The only variation in colour (actually intensity) is present at the lines. Lemme see if I can do an ascii art illustration…

¦\
_________________ ¦ \________________________
\ ¦
\¦

If you cover the area where the intensity changes it destroys the illusion that the colour is different on both sides of the line.

]]> By: lansing wedding photographer http://www.neatorama.com/2009/10/05/optical-illusion-shades-of-difference/comment-page-1/#comment-1866768 lansing wedding photographer Tue, 06 Oct 2009 01:48:19 +0000 http://www.neatorama.com/?p=26707#comment-1866768 so cool, I saw a TED conference presentation that showed a similar optical illusion. so cool, I saw a TED conference presentation that showed a similar optical illusion.

]]> By: AlejoHausner http://www.neatorama.com/2009/10/05/optical-illusion-shades-of-difference/comment-page-1/#comment-1866757 AlejoHausner Tue, 06 Oct 2009 01:29:42 +0000 http://www.neatorama.com/?p=26707#comment-1866757 The real issue here is that our eyes and brains work to figure out the MATERIAL properties of what we see, not the exact red/green/blue numbers of the pixels (our eyes aren't simply photometers). The rgb values will change with lighting, and our brains are very good at overcoming such lighting effects and extracting the underlying material's color. When you cover the contrast edge with a pencil, your eyes perceive the different shades on either side as different levels of illumination, and your brain decides that the same material color is present on both sides. @whitcwa: BTW, if you like the illusion you posted, there's a whole bunch of them at Michael Bach's site: (warning: your eyes will hurt) http://www.michaelbach.de/ot/index.html Alejo The real issue here is that our eyes and brains work to figure out the MATERIAL properties of what we see, not the exact red/green/blue numbers of the pixels (our eyes aren’t simply photometers). The rgb values will change with lighting, and our brains are very good at overcoming such lighting effects and extracting the underlying material’s color. When you cover the contrast edge with a pencil, your eyes perceive the different shades on either side as different levels of illumination, and your brain decides that the same material color is present on both sides.

@whitcwa: BTW, if you like the illusion you posted, there’s a whole bunch of them at Michael Bach’s site: (warning: your eyes will hurt)

http://www.michaelbach.de/ot/index.html

Alejo

]]> By: whitcwa http://www.neatorama.com/2009/10/05/optical-illusion-shades-of-difference/comment-page-1/#comment-1866726 whitcwa Tue, 06 Oct 2009 00:52:34 +0000 http://www.neatorama.com/?p=26707#comment-1866726 This picture illustrates the same illusion, http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html?gray This picture illustrates the same illusion,
http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html?g ray

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