OT: Color perception

[Roman]

Not exactly about cameras or photography, but still interesting for photogrphers, I guess (and pretty amazing) - look for yourself:

http://www.echalk.co.uk/amusements/OpticalIllusions/colourPerception/colourPerception.html

BTW, found the link in another forum.

Roman

 

[Roger Hicks]

Better still, look for 'Eye and Brain' and 'The Intelligent Eye' by Richard Gregory. He was (maybe still is) a professor at the University of Bristol in the area of perception.

Cheers,

Roger

 

[Fred]

Very interesting. If I had not seen it I would not have believed it. Thanks for the post.

Roger, I'll look out for the titles. I should (at least in theory) be able to use this to create some interesting images, I'll have to load up some freshly chilled Velvia. Normal stuff is B&W.

 

[rbiemer]

Roman,
Thanks for the link--I sort of knew this before but that site gives a very good demo!
Roger,
Thanks for the titles--good fodder for my K.A.S.(Knowledge Aquisition Syndrome).
Rob

 

[Heath]

Thanks for the link. That is totally amazing. I would not have believed it if I had not seen it.

Heath

 

[bmattock]

Funny - they don't work on me. I suspect it may be because I'm color-blind. Hmmm.

The first two I can at least understand, but Illusion 3 had me scratching my head - both cross-pieces look like gray to me - identical. I don't 'see' the yellow they claim. The mask was not required for me to 'see' the identical colors.

Best Regards,

Bill Mattocks

 

[Sonnar Brian]

They work on me; Those are impressive demos.

 

[Little Prince]

Quite amazing! Illusion 2 is the most easily believed, you can sort of tell. I once read a book called 'phantoms in the brain' which may get rather technical at points but is full of case studies and such. I remeber one interesting optical illusion mentioned (and demo'd) with explanation. It was about how a set of shaded circles that looked concave, appeared convex when the page was tilted upside down. The amazing explanation was that the mind is subconsciously tuned to perceive things with the automatic supposition that light falls from above. On a 2D object (such as a piece of paper), it equates to light falling from the top of the page, so that when the circle is shaded dark in the top half, it looks concave. When you turn the page upside down, the top half is light and it looks convex. If you were to imagine light striking from below, it would be the other way.