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Colour Perception

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490061.  Tue Jan 27, 2009 4:40 am Reply with quote

So the human eye can't distinguish between some pure wavelengths and combinations of wavelengths.

Colour vision is a relatively new addition to our senses, and is much easier to 'fool' than the more primitive black and white vision, which is why, for example, TV can compress down to a set range of colours and we don't notice, and as you posted, colour constancy.

492206.  Thu Jan 29, 2009 7:37 pm Reply with quote

davini994 wrote:
So the human eye can't distinguish between some pure wavelengths and combinations of wavelengths. And then Aliens might view VDUs completely differently to us.

Maybe not just aliens:
Pittsburgh Post-Gazette: Some women may see 100 million colors, thanks to their genes

The article above suggests that a small percentage of women may have tetrachromatic (four-colour) vision. In theory, such a person might see the images on a typical VDU as relatively crude in their representations of colour (though I can't say I've ever heard anyone express such an opinion myself).

Differences in colour perception between the sexes are more exaggerated in some other primate species. Male New World Monkeys have two-colour vision in most species, while around 60% of females have three-colour vision (source: Wikipedia - Dichromatic Colour Vision).

493468.  Sat Jan 31, 2009 7:30 pm Reply with quote

A contender for the most sophisticated vision in the animal world:
Wikipedia: Mantis Shrimp

Some species of mantis shrimp have 16 different types of photo-receptor, allowing them to distinguish light intensities at twelve different frequencies (4 of these in the ultra-violet range). The other 4 photo-receptors are for detecting polarization of light.

Each of the mantis shrimp's two eyes has three sections, giving it trinocular vision and the ability to perceive depth independently with each eye. The eyes are mounted on stalks that can be moved independently to provide a wide field of view.

493471.  Sat Jan 31, 2009 7:32 pm Reply with quote

Lots more interesting stuff on colour vision here:
DIY Calculator - Color Vision: One of Nature's Wonders


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