I found this interesting.

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

Nice one secrets :cool2:

This reminds me a bit of a Tv programme I saw years ago about an american named Land (he invented the Polaroid camera) and his experiments with colour - I remember one wher he was showing how colour is affected by surrounding colours, and having masked out squares in a projected colour grid, showed how you could predict what the missing colour would be based on the surrounding colours.

Illusion 1 is impressive; illusion 2 less so. But illusion 3 is a bit of a fraud, I'm afraid. I've compared a highly blown-up version of the centre pieces of both objects, and they are in fact different colours. The right hand piece has more yellow components on a pixel-by-pixel comparison.

illusion 3 is a bit of a fraud, I'm afraid. I've compared a highly blown-up version of the centre pieces of both objects, and they are in fact different colours. The right hand piece has more yellow components on a pixel-by-pixel comparison.

Nevertheless, with the mask on they look the same.

I thought the one on the right looked yellower even with the mask on...

But this does intriguingly link into our discussions about colour. It is extremely irksome that this seems to support your view. :p

Having looked again at illusion 3, I must definitely call into question the existence of "yellow" and ergo "red". Bah.

But this does intriguingly link into our discussions about colour. It is extremely irksome that this seems to support your view. :p

It does, doesn't it? You're just gonna have to change your p.o.v. then you won't feel irked about it!

1ST one was freaky.

2ND one was easy to see.

3RD one I'm with Blink...I thought the right one was lighter even with the mask on. :sad:

It does, doesn't it? You're just gonna have to change your p.o.v. then you won't feel irked about it!Enough of the smugness already. Allow me the dignity of conceding grumpily.

:laugh:

No Blinkus don't give in.... :w00t: :boxing:

“The colours red, blue and green are real. The colour yellow is a mystical experience shared by everybody.” (Stoppard, 1967).

Colour is a vivid visual experience we (almost) all share. But what exactly is it that we are experiencing when we see red (or yellow)? When two people agree that something looks yellow, how can they know if they are actually sharing an experience or if they have simply learned a common association. For example, we all grow up learning that bananas are yellow, so we know that the colour we experience when looking at a banana must be yellow. But is my experience of yellow the same as yours, and is it meaningful even to ask this question? In some ways our understanding of colour vision has advanced enormously in recent years. Thanks to the advent of single-cell electrophysiology we have learnt a lot about the neural basis of the processing of chromatic information. However, on a philosophical level some fundamental questions are still unresolved. For example, what is the proper metaphysical status of colour? Is it the property of an object or is it a purely subjective experience?

*We may require a larger group of experimental subjects.:) *

http://www.psych.ucalgary.ca/PACE/VA-Lab/colourperceptionweb/theories.htm

See what you think about this.

Head hurts now... :sad:

“The colours red, blue and green are real. The colour yellow is a mystical experience shared by everybody.” (Stoppard, 1967).*

Who is Stoppard?

What does he mean by 'real' and 'mystical' in this passage?

Re the link, it is more to do with how light receptors deal with signals, and when it concludes with :

In fact, as you have seen, both theories are needed to explain what is known about colour vision.

I would have to disagree, neither theory considers the issue of whether colour in itself is a subjective product or if it is embedded in the object, so they certainly don't explain everything about colour vision.

With regard to your earlier quote about bananas, the answer is I have no way of knowing if my yellow looks the same as yours, but I do know that in the case of a colour blind man some things will look different to us.