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Old May 29th 2019, 03:27 AM   #1
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Join Date: May 2019
Posts: 1
Photometry and CIE parameters

I need some help. I fully don't understand how to calculate color rendering index (CRI), if I know these data from spectrometer measurments (and values):

Tw (tint)
W (whiteness)
hab (hue-angle)
huv (hue-angle)
pe (excitation purity)
suv (saturation)
CIE1960 u
CIE1960 v
Hunter L
Hunter a
Hunter b

Is there any formula for it? Because, how I looked on the internet, I couldn't find any good solution possibilty for it, just only using calculators (where need to give all intensity values for every wavelength). Or maybe this is only one possibility to solve it, I really don't understand.
From these data, yes, I could calculate CCT value, but maybe also CRI and other photometry calculations to describe a properties of measured light..?

Last edited by Shine; May 29th 2019 at 05:19 AM.
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Old May 29th 2019, 09:20 AM   #2
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Location: England
Posts: 1,003
Infrequently (thankfully) I have had reason to touch upon the subject of colour rendering,
and I have always been surprised by how non-rigorous it seems to be.

Looking at the current Wikipedia page on this topic has not particularly changed my view.

Luckily (for me) none of my applications have been critical, "good enough" was good enough,
and it has never been necessary for me to really delve into the heart of the subject.

I'm sorry that this will not help you,
perhaps there is an image processing expert out there who can give us some proper pointers.
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cie, cri, parameters, photometry

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