Talk:Color rendering capacity

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Redirected ColorRendering page here. There may be worthwhile text in it's history. It went through VfD with 2 delete votes and one redirect vote; see here. JesseW 08:32, 25 Nov 2004 (UTC)

[edit] "Note" from article

I moved this note from the article, as it doesn't cover the cases, where the CRC gives additional information:

Note: this measure does not seem significantly more informative than simply knowing the saturation and value of the light source; rendering capacity clearly increases proportionally with value and inversely with saturation (although not necessarily linearly). The actual mathematics becomes somewhat more complicated depending on the color space in question. For example there may be a hue dependent scaling factor depending on whether the color space used has already compensated volumewise for the relative color resolution powers of the human eye (the presumed observer in question).

IMHO the key point is, that light sources which are perceived as nearly identical for themselves (by humans and by standard human vision oriented models), can have different CRCs: The CRC of a true monochromatic source is zero, but a source composed of two monochromatic sources which in additive color composition give the same hue, has non-zero CRC. Of course the latter has a lower saturartion, so "inversely with saturation (although not necessarily linearly)" covers this somewhat. But using more complicated combinations of monochromatic sources, it should be possible to create effective sources of equal HSV but different CRC. --Pjacobi 08:05, 1 Dec 2004 (UTC)

Yes, I wasn't trying to imply that rendering capacity is completely redundant, only that if you take the rendering capacity and divide it by the value, what you're left with is something fairly similar to saturation: a normalized scalar measure of the relative flat-bandness of the spectrum. They are not identical, but they are similar. And my impression is that both are based on tristimulus spaces, further reducing their differences.

I think the dependency on the assumed observer is worth bringing up, so I would suggest returning the paragraph to the article with the first sentence revised to say that the two measures are similar, rather than my original approach of denigrating capacity. I think I was tempted to put that provokative stuff in because I really needed to get some response to know whether I had defined the quantity competently. --Chinasaur 22:43, 1 Dec 2004 (UTC)

Somebody study the info in the Reference section. I believe their are 2 new methods to catagorize lighting which are not here yet, but are on the way, and are very crucial. [[User:Dkroll2:Dkroll2]--[[User:Dkroll2|Dkroll2]] 14:27, Dec 14, 2004 (UTC)

[edit] Moved from article

I am very reluctant normally to remove stuff from a talk page, but ... I removed the spammy commercial material in this section. With the links intact, whoever orginally added it to the article was still accomplishing their objective while it was on the talk page -- a link on Wikipedia can substantially improve another site's Google rank. --A. B. 21:29, 12 July 2006 (UTC)

[edit] What's this?

How does this relate to color rendering index? Is it a quantitative measure? The references seem to imply that this is a medical or optometric measure of some sort, but I'm having trouble understanding quite what it's saying. grendel|khan 13:26, 2005 May 26 (UTC)

It's a quantitative measure. The sparse explanation in the article seems minimally adequate: Whereas the CRI compares illumnating eight standard samples and is a valid indicator of the "quality" of the light only for sources of equal color temperatur, the CRC aims in giving a measurer of the percentage of the color space achievable with some light. --Pjacobi 15:17, 2005 May 26 (UTC)