Talk:LMS color space

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thread_title:  External links modified 

message: I have for Illuminant E:
 {+ 0.243   , + 0.856   , - 0.044   }
 {- 0.391   , + 1.165   , + 0.087   }
 {+ 0.010   , - 0.008   , + 0.563   }
--User:GENtLe (talk) 
: I added quite a few matrices, and sourced them. Does it answer your question? --Adoniscik (talk) 05:37, 17 February 2008 (UTC)
thread_title: Which Illuminant is the given matrix for?

message: If there is no objective canonical transformation from XYZ color space to "LMS color space", then it would follow that there also isn't "the LMS color space", but rather LMS color spaces. In fact, at least as many LMS color spaces as there are transformations XYZ->LMS. --93.209.95.156 (talk) 14:32, 27 October 2017 (UTC)
replies: text: Nope, there is one LMS color space and several mathematical XYZ → LMS transformations which are all approximations as no exact mathematical transformation exists, at least not one that can be executed many million times per second, which is required in digital imaging. See also my answer below. --Uli Zappe (talk) 20:36, 1 November 2017 (UTC)
thread_title: LMS color space or LMS color spaces?

message: Also look here https://en.wikipedia.org/wiki/ICtCp, that is where I found the mistake. This matrix is mentioned in errata http://rit-mcsl.org/fairchild//PDFs/Errata2e.pdf and is correct in 3rd edition (but this matrix is for entirely another thing). That is a very important thing! Ready for comments. 2A00:1370:812C:5D73:4493:5501:BB24:D2E6 (talk) 03:31, 21 March 2020 (UTC)
replies: text: Good find. Dicklyon (talk) 04:15, 21 March 2020 (UTC)
replies: text: After disscusion here https://github.com/colour-science/colour/issues/121 we actually came to a conlusion the original was correct. So who knows how they get IPT matrix... Also maybe add this http://brucelindbloom.com/Eqn_ChromAdapt.html, though again who knows if everything there is correct)) 2A00:1FA0:4690:7E51:6DD2:9FBF:715F:2C3B (talk) 05:50, 21 March 2020 (UTC)
replies: text:  ICtCp color space was derived specifically in the context of displaying images on displays with a native color space near Rec.2020 and with the PQ transfer function. During its construction many of the parameters were optimized based on these factors and although the initial values of the model may have derived from the HPE code fundamentals, they may have changed during the optimization of ICtCp. (i.e. Initial vs. final value). [ref. personal communications, sorry I don't have anything better to cite! ] TDcolor (talk) 02:40, 18 October 2021 (UTC)
replies: text: I was talking about IPT as used in Dolby Vision. Not ICtCp, which is btw can be used for any space, not only 2020 gamut and pq transfer, any. Just the change of first mttix is needed. Valery Zapolodov (talk) 21:40, 11 December 2021 (UTC)
thread_title:  I fixed incorrect matrix