Why does CIE use 'imaginary' primaries? What is represented by points outside the CIE chart? For CIE questions, you can assume you will have a chart printed out for you.

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Why does CIE use 'imaginary' primaries? What is represented by points outside the CIE chart? For CIE questions, you can assume you will have a chart printed out for you.



Answer: Imaginary primaries are coordinate axes outside of color space- Michelle says that they were arbitrarily chosen (just math to make the axes fit). They are perfectly good coordinates, but not actually colors. Used so that all colors can be put in terms of positive coordinates. They are mathematically plausible but not producible or perceived.

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