Edit File: convertRec2020ToXyz65.js
/* Convert Rec. 2020 values to CIE XYZ D65 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 linearize = v => { let abs = Math.abs(v); if (abs < β * 4.5) { return v / 4.5; } return (Math.sign(v) || 1) * Math.pow((abs + α - 1) / α, 1 / 0.45); }; const convertRec2020ToXyz65 = rec2020 => { let r = linearize(rec2020.r); let g = linearize(rec2020.g); let b = linearize(rec2020.b); let res = { mode: 'xyz65', x: 0.6369580483012911 * r + 0.1446169035862083 * g + 0.1688809751641721 * b, y: 0.262700212011267 * r + 0.6779980715188708 * g + 0.059301716469862 * b, z: 0 * r + 0.0280726930490874 * g + 1.0609850577107909 * b }; if (rec2020.alpha !== undefined) { res.alpha = rec2020.alpha; } return res; }; export default convertRec2020ToXyz65;
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