generated from erangel1/generic-template
26 lines
711 B
JavaScript
26 lines
711 B
JavaScript
import { k } from '../xyz50/constants.js';
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import { D50 } from '../constants.js';
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export const u_fn = (x, y, z) => (4 * x) / (x + 15 * y + 3 * z);
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export const v_fn = (x, y, z) => (9 * y) / (x + 15 * y + 3 * z);
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export const un = u_fn(D50.X, D50.Y, D50.Z);
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export const vn = v_fn(D50.X, D50.Y, D50.Z);
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const convertLuvToXyz50 = ({ l, u, v, alpha }) => {
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let up = u / (13 * l) + un;
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let vp = v / (13 * l) + vn;
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let y = D50.Y * (l <= 8 ? l / k : Math.pow((l + 16) / 116, 3));
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let x = (y * (9 * up)) / (4 * vp);
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let z = (y * (12 - 3 * up - 20 * vp)) / (4 * vp);
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let res = { mode: 'xyz50', x, y, z };
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if (alpha !== undefined) {
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res.alpha = alpha;
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}
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return res;
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};
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export default convertLuvToXyz50;
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