Edit File: convertXyz65ToRec2020.js
/* Convert CIE XYZ D65 values to Rec. 2020 References: * https://drafts.csswg.org/css-color/#color-conversion-code * http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html * https://www.itu.int/rec/R-REC-BT.2020/en */ const α = 1.09929682680944; const β = 0.018053968510807; const gamma = v => { const abs = Math.abs(v); if (abs > β) { return (Math.sign(v) || 1) * (α * Math.pow(abs, 0.45) - (α - 1)); } return 4.5 * v; }; const convertXyz65ToRec2020 = ({ x, y, z, alpha }) => { let res = { mode: 'rec2020', r: gamma( x * 1.7166511879712683 - y * 0.3556707837763925 - 0.2533662813736599 * z ), g: gamma( x * -0.6666843518324893 + y * 1.6164812366349395 + 0.0157685458139111 * z ), b: gamma( x * 0.0176398574453108 - y * 0.0427706132578085 + 0.9421031212354739 * z ) }; if (alpha !== undefined) { res.alpha = alpha; } return res; }; export default convertXyz65ToRec2020;
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