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### Course: Pixar in a Box>Unit 5

Lesson 2: Color spaces

# CIE chromaticity diagram

The CIE chromaticity diagram, created by the International Commission on Illumination, represents all colors humans can perceive. Its perceptual uniformity allows us to find the mixture of two colors by looking at their midpoint, whereas the hue saturation color wheel does not.

## Want to join the conversation?

• why is the triangle shaped like that
• I think he made a mistake when he says "this defines all colours of a single wavelength". Doesn't each colour have a different wavelength?
• Yes, each colour has a different wavelength. He means that the line around the outside defines the "pure" colours, those colours that can be produced by light of a single wavelength (such as pure red or pure green). The colours in the center of the diagram are colours that are produced by mixing the pure colours, so have a mixture of wavelengths. For example, white light cannot be produced with light of a single wavelength; you can only get it by mixing light with different wavelengths.
• At it said CIE diagram, what does CIE stand for?
• It stands for Comission Internationale de l'Eclairage (International Commission on Illumination).
• what are cones and rods
• they are light-sensing cells in our eyes. :)
• What happens if our eyes rest on something with a color we can't percieve? My guesses are it will be black, or look invisible.
• That means in this CIE chromaticity diagram these Infrared and ultraviolet colors are not present.
• Why is there no dark green on the CIE diagram as there is on the color wheel?
• How do you make sure you get a properly colored movie in all forms and devices?? Can someone Heeeeeeelp Meee Pleeeeeaaaaase!
• What is a CIE?
• In the video, the person mentioned that it's the science group that discovered / did the studies in which the triangle colour wheel was founded :)
• Every now and then I keep stumbling upon articles stating that "human eye can perceive more shades of the colour green than any other". If that is true, why is do I see a larger area of the CIE diagram covered by blue-purple colours and not green?
Or does it have something to do with my screen's colour gamut?