CIE 228:2018

CIE 228:2018

Grey-Scale Calculation for Self-Luminous Devices

standard by Commission Internationale de L'Eclairage, 03/01/2018

Secure PDF English € 90.00 EUR Immediate Download
Printed Edition English € 90.00 EUR Ships in 1-2 business days
Printed Edition + PDF English € 122.00 EUR Immediate Download

上列價格為CIE國際定價,向CIE-Taiwan訂購可享折扣優惠,CIE-Taiwan會員更享有會員優惠價,歡迎來電03-5743875或e-mail : 洽詢。

Full Description

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:

• for mesopic light levels (e.g. cinema and video);

• to calculate effects of any particular visual subtense and shape of contrasts;

• to reflect the effects of stimulus geometry (e.g. comparison of adjoining fields versus separated fields);

• 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.

Product Details



Number of Pages:40

File Size:1 file , 1.6MB



八月   2018
      1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30 31