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I have absorbance values for blood plasma. Absorbance was measured in range of 380 – 600 nm every 5 nm ending up with absorbance values for 45 wave lengths. I was browsing through literature, and I came across chromacity coordinates (XYZ) and this seems to be a very convenient way of summarizing data about color in just two data points. I have been reading some literature about different colorimetric systems, but since my background is in genetics, it didn’t make much sense for me. Therefore, I would like to ask you if it is possible to calculate these chromacity coordinates using my absorbance values and if so does anyone now some kind of software for this or exact formulas on how to do it?

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What a great question! This said, I suspect you'd have better luck on phys.SE with this one as there are some people quite knowledgable in colorimetry who hang out there. – Richard Terrett Feb 20 at 10:31
Actually, it is pretty obvious. The wiki article about CIE color space has precise definition how to calculate color. However, having absorbance values does not give spectrum of reflected light, only of light passed through. There is a difference. Moreover, the layers of blood with different thickness will have different colors. So, short answer is: no, you cannot. – permeakra Feb 20 at 21:57

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