{"id":122,"date":"2018-10-23T11:36:38","date_gmt":"2018-10-23T18:36:38","guid":{"rendered":"https:\/\/videoq.com\/blog2\/?p=122"},"modified":"2025-10-12T19:01:50","modified_gmt":"2025-10-13T02:01:50","slug":"hdr-video-tables-of-reference-values","status":"publish","type":"post","link":"https:\/\/videoq.com\/blog2\/2018\/10\/23\/hdr-video-tables-of-reference-values\/","title":{"rendered":"HDR and WCG Parameters"},"content":{"rendered":"\n<p>New <strong>HDR <\/strong>and <strong>Wide Color Gamut<\/strong> (WCG)\u00a0<strong> <\/strong>formats relies on large variety of video processing chain parameters.<br> Even the ubiquitous color bars in HDR version significantly differ from their SDR counterparts.<br>The advent of HDR and Wide Color Gamut technologies demands changes to customs and practices. <br>New workflow rules must also be established and honed. Conversion between <strong>SD<\/strong>, <strong>HD<\/strong>, and <strong>UHD frame sizes<\/strong>, <strong>SDR<\/strong>, <strong>HDR-PQ<\/strong>,  and <strong>HDR-HLG<\/strong> <strong>dynamic range formats<\/strong>, in combination with a variety of <strong>Color Spaces <\/strong>makes the development and maintenance of such workflows very challenging task.<br><br> In mixed SDR\/HDR\u00a0 environments video engineers have to deal with:<\/p>\n\n\n\n<!--more-->\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Three<\/strong> types of <strong>YUV \u21d4 RGB<\/strong> <strong>Color Coding Matrices<\/strong>:<br><br><strong>SD<\/strong> BT.601,\u00a0<strong>HD<\/strong> BT.709 and <strong>UHD<\/strong> BT.2020<br><br><em>(quite often the BT.709 matrix is used for UHD images, which should be encoded by the BT.2020 matrix)<\/em><\/li>\n\n\n\n<li><strong>Four<\/strong> sets of <strong>Color Primaries<\/strong>:<br><br>&#8220;<strong>Narrow Color Gamut<\/strong>&#8221; BT.601, BT.709, <strong>&#8220;Medium Color Gamut&#8221;<\/strong> DCI-P3 and <strong>&#8220;Wide Color Gamut&#8221;<\/strong>\u00a0BT.2020\u00a0<em><em><em>(in practice, we see various combinations of <strong>Master Display Primaries<\/strong> and\u00a0<strong>Encoding Primaries<\/strong>, e.g. DCI-P3 mastering followed by BT.2020 encoding)<\/em><\/em><\/em><\/li>\n\n\n\n<li><strong>Three<\/strong> sets of\u00a0<strong>Transfer Functions<\/strong> (OETF \u21d4 EOTF):<br><br><strong>SDR<\/strong> BT.709, <strong>HDR-PQ<\/strong> BT.2100, <strong>HDR-HLG<\/strong> BT.2100<br><br><em>(also so-called optimized OOTF, i.e. <strong>non-standard<\/strong> HDR camera and\/or display transfer function)<\/em><\/li>\n\n\n\n<li><strong>Two<\/strong> <strong>YUV \u21d4 RGB<\/strong> <strong>Levels Mapping Schemes<\/strong>:<br><br><strong>Narrow <\/strong><em>(aka Broadcast) <\/em><strong>Range<\/strong>\u00a0&amp;<strong> Full <\/strong><em>(aka PC)<\/em><strong> Range<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Now, imagine the total number of combinations and permutations of all these parameters!<\/p>\n\n\n\n<p>Without the appropriate <em><strong>tools<\/strong><\/em> and&nbsp;&nbsp;<em><strong>automated<\/strong> <strong>systems<\/strong><\/em> it is nearly impossible to provide an efficient video content workflow <strong>QA\/QC<\/strong>.<\/p>\n\n\n\n<p>Add to the above mentioned factors several <strong>Color Space Conversion Matrices<\/strong>&nbsp; combined with the&nbsp;&nbsp;<strong>Color Gamut Mapping Functions <\/strong>performing&nbsp;1D or 3D conversion of &#8220;linear light&#8221; RGB values between various dynamic range formats and different primaries. Thus, apparently, the life of video engineer should become absolutely unbearable.<\/p>\n\n\n\n<p>However, in the daily practice of live event coverage and similar challenging production situations, engineers already found good solutions and even established <em>de-facto<\/em> standards allowing them to work efficiently in such a multi-format environment.<\/p>\n\n\n\n<p>For more details about the mentioned parameters see posts in the <a href=\"https:\/\/videoq.com\/blog2\/category\/video-science-fundamentals\/\"><strong>Video Science&nbsp;Fundamentals <\/strong><\/a>category.<\/p>\n\n\n\n<p>For the HDR and WCG analysis tools and levels alignment procedures see posts in the\u00a0<strong><a href=\"https:\/\/videoq.com\/blog2\/category\/videoq-analyzers\/\">VideoQ Analyzers <\/a><\/strong>and <strong><a href=\"https:\/\/videoq.com\/blog2\/category\/videoq-analyzers\/videoq-test-patterns\/\">VideoQ Test Patterns<\/a>\u00a0<\/strong>categories.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>New HDR and Wide Color Gamut (WCG)\u00a0 formats relies on large variety of video processing chain parameters. Even the ubiquitous color bars in HDR version significantly differ from their SDR counterparts.The advent of HDR and Wide Color Gamut technologies demands changes to customs and practices. New workflow rules must also be established and honed. Conversion &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/videoq.com\/blog2\/2018\/10\/23\/hdr-video-tables-of-reference-values\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;HDR and WCG Parameters&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,11],"tags":[],"class_list":["post-122","post","type-post","status-publish","format-standard","hentry","category-hdr-and-wcg-parameters","category-video-science-fundamentals"],"_links":{"self":[{"href":"https:\/\/videoq.com\/blog2\/wp-json\/wp\/v2\/posts\/122","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/videoq.com\/blog2\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/videoq.com\/blog2\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/videoq.com\/blog2\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/videoq.com\/blog2\/wp-json\/wp\/v2\/comments?post=122"}],"version-history":[{"count":51,"href":"https:\/\/videoq.com\/blog2\/wp-json\/wp\/v2\/posts\/122\/revisions"}],"predecessor-version":[{"id":594,"href":"https:\/\/videoq.com\/blog2\/wp-json\/wp\/v2\/posts\/122\/revisions\/594"}],"wp:attachment":[{"href":"https:\/\/videoq.com\/blog2\/wp-json\/wp\/v2\/media?parent=122"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/videoq.com\/blog2\/wp-json\/wp\/v2\/categories?post=122"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/videoq.com\/blog2\/wp-json\/wp\/v2\/tags?post=122"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}