Talk:Illuminant D65

message: I finally found it in amazon's search; the Schanda ref obviously just made an error in typesetting a table, as that's the only place where D65 is written with subscripted 65.  So let's leave it out, OK? Dicklyon (talk) 05:31, 17 April 2008 (UTC)
replies: text: I’ve been reading through a bunch of color science papers, and as far as I can tell, using the subscript is the standard notation (as well as sometimes italicized capital letters for illuminants). Is there a source which recommends the "D65" notation, or is that just an artifact of writing (e.g. on typewriters) where subscripts are difficult to achieve?  (I don’t have easy access to the CIE specifications themselves; if anyone does, and would write in, that would be great.) –jacobolus (t) 16:12, 10 May 2010 (UTC)

text: Books that use a subscript (sitting in a university library, so they were handy :): Agoston’s 1979/1987 Color Theory and its Application in Art and Design (part of a series edited by MacAdam), Wyszecki & Stiles’s 1982 Color Science. Billmeyer & Saltzman’s 1966 Principles of Color Technology refers to the “proposed illuminant D6500” (which had apparently not yet quite been ratified by the CIE after its recommendation by one committee, based on Judd’s work). Gerritsen’s Theory and Practice of Color just refers to “standard D”. Fairchild’s 2002 Color Appearance Models uses the “D65”, etc. nomenclature. –jacobolus (t) 19:10, 13 May 2010 (UTC)
replies: text: Yes it would be best to find an authoritative source like a CIE standard.  Based on my perusal of books on Google Book Search, though, I'd say the overwhelmingly most common way is NOT subscripted, especially in the expression "CIE illuminant D65".  Dicklyon (talk) 23:04, 13 May 2010 (UTC)
thread_title: Subscript?

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message: I removed the edit by user @Crissov where chromaticity coordinates were expressed as % values, in addition I also verified the chromaticity values using the XYZ values stated on the article. Chromaticity coordinates are not a scaler color space, there is no relative meaning between 0 and 1. While it is true that in the 2-degree chromaticity space, the values do add up to 1 this is not true for other chromaticity spaces. It's merely a small mathematical artifact from other design decisions for the 1931 std. obs. TDcolor (talk) 17:10, 26 April 2023 (UTC)
replies: text: What do you mean don't add up to 1? z = 1 - x - y by definition (x = X / (X + Y + Z) etc.) –jacobolus (t) 17:38, 26 April 2023 (UTC)
thread_title:  Removed Chromaticity %Values