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Colour Matching Functions CIE

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Im trying to understand some of the colour matching function theory. I've come across curves such as:

And dont quite understanf how it is used. Say if you wanted to convert a wavelength to an RGB triplet, why can't you just read the values directly off the graph?

So that 460nm would be something like [0.35, 0.001, 1.8]?

Secondly, why are the values from 0-2 and not simply 0-1?

When using these functions, do you always have to have the Spectral Power Distribution of the material you're working with to integrate with?

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