{"id":526,"date":"2015-11-01T16:02:00","date_gmt":"2015-11-01T21:02:00","guid":{"rendered":"https:\/\/designinglight.com\/?p=526"},"modified":"2015-11-01T16:02:00","modified_gmt":"2015-11-01T21:02:00","slug":"cri-inches-forward","status":"publish","type":"post","link":"https:\/\/designinglight.com\/?p=526","title":{"rendered":"CRI Inches Forward"},"content":{"rendered":"

The CIE\u2019s Color Rendition Index (CRI) has long had several known weaknesses including outdated components of the calculations, a limited set of color samples, and standard reporting of only one piece of data (the average color distortion of the first eight colors, known as the General Color Rendering Index or Ra). After more than a decade of stalemate it seems that the IES\u2019s TM-30 has convinced the CIE to make another attempt at updating CRI.<\/p>\n

In a recently released position statement<\/a> the CIE announced that the CRI technical committee (TC 1-90) has taken up the problem again and is expected to write a technical report on a new, improved color fidelity metric that can update CRI before the end of 2016. They will use TM-30 Rf<\/sub> as the basis for their work. Another committee, TC 1-91, will write a report on a color preference metric in the same time period.<\/p>\n

This is both good and bad news. CRI is the<\/u> international standard for measuring and reporting light source color rendering. It is long overdue for an update, and I\u2019m glad to see the CIE working on it. On the downside, the press release makes it sound as though 1) parts of TM-30\u2019s Rf<\/sub> may be incorporated, but the CRI fidelity metric will be a new creation 2) we may see the addition of a color preference metric but TM-30\u2019s gamut metric Rg<\/sub> apparently isn\u2019t being considered. The biggest reason that this is a concern is the amount of time it takes to create the work, gain internal consensus, approve the work, and gain organization approval – all of this before the work can be released to the larger lighting community for consideration. I think it is extremely optimistic to think that the two committees can write meaningful reports on these issues in only one year, especially given the difficulty they\u2019ve had reaching consensus in the past.<\/p>\n

I would much rather see the CIE committees study TM-30 and report on its strengths and weaknesses before deciding that it won\u2019t work and they should start over. Adopting or modifying TM-30 can happen much quicker than developing one or more new metrics. TM-30 took three years to develop and the industry shouldn\u2019t have to wait another three years for an updated metric that has the CIE\u2019s approval.<\/p>\n","protected":false},"excerpt":{"rendered":"

The CIE\u2019s Color Rendition Index (CRI) has long had several known weaknesses including outdated components of the calculations, a limited set of color samples, and standard reporting of only one piece of data (the average color distortion of the first eight colors, known as the General Color Rendering Index or Ra). After more than a … Continue reading CRI Inches Forward<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[12,18,17],"tags":[27,26],"class_list":["post-526","post","type-post","status-publish","format-standard","hentry","category-color","category-design","category-light","tag-color-rendering","tag-cri"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p4gZSw-8u","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"jetpack-related-posts":[{"id":719,"url":"https:\/\/designinglight.com\/?p=719","url_meta":{"origin":526,"position":0},"title":"CIE Adopts TM-30 (sort of)","author":"Jason Livingston","date":"May 3, 2017","format":false,"excerpt":"The CIE has issued a statement titled \"CIE 2017 Colour Fidelity Index for accurate scientific use\" in which they partially adopt the Rf fidelity metric of TM-30. \u00a0Here are some of the details. When the IES released TM-30-15 it seemed to be a wake up call for the CIE, who\u2026","rel":"","context":"In "Color"","block_context":{"text":"Color","link":"https:\/\/designinglight.com\/?cat=12"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":5394,"url":"https:\/\/designinglight.com\/?p=5394","url_meta":{"origin":526,"position":1},"title":"A Brief History of TM-30","author":"Jason Livingston","date":"April 9, 2026","format":false,"excerpt":"Next Wednesday I\u2019ll be giving a presentation on LP-30 at LEDucation (hope to see you there!), and in preparing for it I\u2019ve been reflecting on how far we\u2019ve come in our understanding and evaluation of color rendering. \u00a0 The Color Rendering Index (CRI) was published by the International Commission on\u2026","rel":"","context":"In "Color"","block_context":{"text":"Color","link":"https:\/\/designinglight.com\/?cat=12"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":4324,"url":"https:\/\/designinglight.com\/?p=4324","url_meta":{"origin":526,"position":2},"title":"CIE Recommends Transition from CRI to Rf","author":"Jason Livingston","date":"January 21, 2025","format":false,"excerpt":"Earlier this month, CIE published CIE Position Statement on Color Quality Metrics, in which it recommends the lighting industry transition from the outdated and sometimes inaccurate General Color Rendering Index (CRI) to the General Color Fidelity Index (Rf ) defined in CIE 224:2017. \u00a0The position statement notes that problems with\u2026","rel":"","context":"In "Color"","block_context":{"text":"Color","link":"https:\/\/designinglight.com\/?cat=12"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":386,"url":"https:\/\/designinglight.com\/?p=386","url_meta":{"origin":526,"position":3},"title":"A New Color Rendering Metric","author":"Jason Livingston","date":"May 11, 2015","format":false,"excerpt":"At last week\u2019s Lightfair one of the presentations was Quantifying Color Rendition: A Path Forward. The presentation was the first public look at the (not yet approved) IES Method of quantifying color rendering. What is this new (not yet approved) IES Method? Let\u2019s start with a quick review of the\u2026","rel":"","context":"In "Color"","block_context":{"text":"Color","link":"https:\/\/designinglight.com\/?cat=12"},"img":{"alt_text":"CRI Test Color Sample SPDs","src":"https:\/\/i0.wp.com\/designinglight.com\/wp-content\/uploads\/2015\/05\/CIE_CRI_TCS_SPDs.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/designinglight.com\/wp-content\/uploads\/2015\/05\/CIE_CRI_TCS_SPDs.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/designinglight.com\/wp-content\/uploads\/2015\/05\/CIE_CRI_TCS_SPDs.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":769,"url":"https:\/\/designinglight.com\/?p=769","url_meta":{"origin":526,"position":4},"title":"R.I.P. CRI","author":"Jason Livingston","date":"October 16, 2017","format":false,"excerpt":"It's been a little over two years since the IES released TM-30-15 IES Method for Evaluating Light Source Color Rendition. \u00a0In that time TM-30 has seen growing support in the industry and a growing body of evidence for its accuracy and usefulness. \u00a0We've nearly reached the moment when we can\u2026","rel":"","context":"In "Calculations"","block_context":{"text":"Calculations","link":"https:\/\/designinglight.com\/?cat=6"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2447,"url":"https:\/\/designinglight.com\/?p=2447","url_meta":{"origin":526,"position":5},"title":"Manufacturers Don’t Understand Color Rendering","author":"Jason Livingston","date":"March 17, 2022","format":false,"excerpt":"I attended LEDucation in New York City this week. \u00a0While there I spoke to over two dozen manufacturers, none of whom understood color rendering beyond the (partially accurate) belief that higher CRI is better. \u00a0My conversations when like this. Lighting Salesperson: \"Our color rendering is great. \u00a0Our CRI is over\u2026","rel":"","context":"In "Color"","block_context":{"text":"Color","link":"https:\/\/designinglight.com\/?cat=12"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/designinglight.com\/index.php?rest_route=\/wp\/v2\/posts\/526","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/designinglight.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/designinglight.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/designinglight.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/designinglight.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=526"}],"version-history":[{"count":1,"href":"https:\/\/designinglight.com\/index.php?rest_route=\/wp\/v2\/posts\/526\/revisions"}],"predecessor-version":[{"id":527,"href":"https:\/\/designinglight.com\/index.php?rest_route=\/wp\/v2\/posts\/526\/revisions\/527"}],"wp:attachment":[{"href":"https:\/\/designinglight.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=526"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/designinglight.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=526"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/designinglight.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=526"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}