- Joined
- Mar 23, 2005
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Gee John, that's exactly what I meant to say.(yeah, right!)
Jean said:Light filters out very quickly particularly the short wavelengths such as red.... So it would be an advantage to see "more" than just colour; hue, saturation, polarisation etc would be more useful visual tools than just colour.
J
monty said:I'm not sure what Jean is getting at by mentioning "hue" as distinct from color-- in my experience, hue is defined as the "normalized" color, in systems like HLS and HSV that try to separate out color from "intensity"/"lightness"/"brightness" and "saturation," so I don't understand how an animal could make sense of "hue" without color vision.
monty said:I'm not sure what Jean is getting at by mentioning "hue" as distinct from color-- in my experience, hue is defined as the "normalized" color, in systems like HLS and HSV that try to separate out color from "intensity"/"lightness"/"brightness" and "saturation," so I don't understand how an animal could make sense of "hue" without color vision.
I think the prevailing assumption is that since most cephs seem to only have one visual pigment in their retinas, that they don't have any way to distinguish frequencies-- humans do that by comparing the responses of 3 different pigments, roughly corresponding to red, green, and blue. If there is any alternately proposed mechanism, I've never heard of it.
Feelers said:However this would all be incorrect if a blind octo can match its surroundings , can anyone confirm this? I know it is a common "fact", it appears that it isnt true.
Feelers said:I think monty is correct about "hue", I dont think it's the word we should be using, all the definitions I find are about different shades of colour.
"Color value or saturation, as opposed to brightness or intensity. (2) Tint control. Hue is the parameter of color that allows us to distinguish between colors. The hue, or tint control adjusts the amount of color displayed."
Is there a more appropriot term to use? (I wouldnt have a clue)
Architeuthoceras said:And then there are the colors you think you see.