{"id":510700,"date":"2024-11-05T14:11:36","date_gmt":"2024-11-05T14:11:36","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/cie-2282018\/"},"modified":"2024-11-05T14:11:36","modified_gmt":"2024-11-05T14:11:36","slug":"cie-2282018","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/cie\/cie-2282018\/","title":{"rendered":"CIE 228:2018"},"content":{"rendered":"<p>Contemporary colour media, to which a self-luminous grey (or more generally, neutral) scale would apply, include light emitting diode (LED) displays and liquid crystal displays (LCD). Every colour-difference calculation has a neutral or achromatic component. In stand-alone mode, this neutral scale can be used to calculate barely-visible threshold changes in luminance, equal-appearing suprathreshold steps of grey scale, matching grey appearance or conspicuousness of grey targets during visual search. CIE lightness, L*, as part of the CIELAB and CIELUV colour spaces, was developed to serve similar purposes for reflective materials, and it was adapted in 1983 for use with cathode-ray tube (CRT) displays. Self-luminous devices such as computer displays, wide-area luminaires (when used not for lighting but for artistic or information purposes), advertising media, signage, safety lights, scientific and medical displays, avionics and heads-up displays, often exhibit high luminance, high spatial resolution and high contrast that require a self-luminous neutral scale. A self-luminous neutral scale does not require specification of a reference white; instead it is a function of the background luminance of the visual target, thus the scale has no upper limit. Because the self-luminous neutral scale can involve high contrast over a small visual subtense, it accounts for intraocular scattering. Finally, a self-luminous neutral scale enables the calculation of colour differences (e.g. CIELAB, CIEDE2000, or OSA-UCS) between self-luminous image segments, including consideration of a neutral point. This report recommends a method to calculate a self-luminous neutral scale fulfilling these requirements. The report also refers to applications, for which the recommended calculation could be improved: <\/p>\n<ul>\n<li> for mesopic light levels (e.g. cinema and video);<\/li>\n<li> to calculate effects of any particular visual subtense and shape of contrasts;<\/li>\n<li> to reflect the effects of stimulus geometry (e.g. comparison of adjoining fields versus separated fields);<\/li>\n<li> to incorporate post-retinal effects (e.g. due to visual cortical computations, such as the white point), and highlights in the surround not adjoining the visual target.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p><b>Grey-Scale Calculation for Self-Luminous Devices<\/b><\/p>\n<table style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/cie\/\"><b>CIE<\/b><\/a><\/td>\n<td>2018-03-01<\/td>\n<td>40<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":510710,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2690],"product_tag":[],"class_list":{"0":"post-510700","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-cie","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/510700","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/510710"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=510700"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=510700"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=510700"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}