Color Vision 3: Color Map
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- เผยแพร่เมื่อ 22 ม.ค. 2013
- The Color Map, or Chromaticity Diagram, tells us a lot about Color. How to specify a color, Dominant Wavelength, results of Mixing, Complements, color Gamut, and various standards for White. Third in a series about Color Vision.
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I am a PhD. student in a Vision Science program and am studying Color vision. These videos are great. Thank you.
First rate presentations. They are a gold standard for teaching - very impressive. Just imagine if all other scientific disciplines had material like this on the net!
It's close. In writing part 2 there were just too many interesting features to fit in, so it expanded into part 3 with a few more details/ examples. Hope you found it useful.
This is without doubt this best series of videos on colour I have seen
Great videos Dr.Blackwell. Thank you for going to the trouble to share your knowledge, it's greatly appreciated, Robert.
These are great videos! Thank you so much C.B.! I really appreciate the knowledge sharing.
Very pedagogical. Excellent.
I appreciate it with your share! Excellent knowledge
Great video. One minor note: opposite colors are Complementary with an 'e', not Complimentary (as in praising one another).
your work is solid Gold
I wish this videos were in HD. Thanks for them. Paul
Great video! Thanks!
Hi Dr. Blackwell, excellent videos! I have two questions: When a colour coordinate is given, x = and y = , so that two parties understand the actual colour, wouldn't the white light, say at C or D65 need to be stated so that both parties understand the colour? Another way of asking, I suppose, is a yellow sample under two different lighting setups has an exact x and y, but just the white light designation changes? Though I suppose having asked this, both yellows could be found under one white light type. The second question is when you say two colours on the diagram, with a straight line between them, the resulting colour is half way along the line, is this equal amounts of perceived light colours?
Why not use 520nm for Green? Wouldn't that define a more complete color space?
I love your videos and how informative they are. Since I'm watching this on an RGB monitor, am I right in thinking that the blue-green region outside the RGB triangle in reality looks different than what I'm seeing on my monitor? Is there a way to get (print?) a CIE chromaticity diagram where all the colours are accurately represented?
I think so.
The CIE chormaticity diagram on this page has the colours about as accurate as you can get (rendered for sRGB colour-space)
You are correct that the colours outside the sRGB colourspace triangle (shown slightly brighter) have to be desaturated for display as they are out-of-gamut.
This one is the same as the second part of the color matching one!
the projection it explains doesn't convince me. I mean, great simple way to let the concept sink, but what if a vector has a smaller module and it doesn't pierce the unit plan? Plus: luminance is treated as a side extra thing and I'd like to understand it more :( (just suggesting, great initiating videos!!)
why X axis from 0 to 0.8 and which is units it?
On the 1931 chromaticity diagram x = X / (X+Y+Z) and y = Y / (X+Y+Z)
where XYZ are tristimulus values.
From the properties of the Xbar Ybar Zbar colour-matching functions, it falls out that the maximum value of x is about 0.75 (there isn't actually a hard cutoff as it depends how far into the infra-red you go, and the eye doesn't have a hard cutoff, just a rapidly decreasing sensitivity)
What meaning number in x and y axis
On the 1931 chromaticity diagram x = X / (X+Y+Z) and y = Y / (X+Y+Z)
where XYZ are CIE tristimulus values.
your work is solid Gold
Solid gold? Or equal parts red and green?