43 lines
809 B
JavaScript
43 lines
809 B
JavaScript
/**
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* @module color-space/cmyk
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*/
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import rgb from './rgb.js';
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const cmyk = {
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name: 'cmyk',
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min: [0, 0, 0, 0],
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max: [100, 100, 100, 100],
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channel: ['cyan', 'magenta', 'yellow', 'black'],
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alias: ['CMYK'],
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rgb: (cmyk) => {
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let c = cmyk[0] / 100,
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m = cmyk[1] / 100,
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y = cmyk[2] / 100,
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k = cmyk[3] / 100,
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r, g, b;
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r = 1 - Math.min(1, c * (1 - k) + k),
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g = 1 - Math.min(1, m * (1 - k) + k),
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b = 1 - Math.min(1, y * (1 - k) + k);
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return [r * 255, g * 255, b * 255];
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}
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};
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rgb.cmyk = (rgb) => {
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let r = rgb[0] / 255,
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g = rgb[1] / 255,
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b = rgb[2] / 255,
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c, m, y, k;
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k = Math.min(1 - r, 1 - g, 1 - b);
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c = (1 - r - k) / (1 - k) || 0;
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m = (1 - g - k) / (1 - k) || 0;
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y = (1 - b - k) / (1 - k) || 0;
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return [c * 100, m * 100, y * 100, k * 100];
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};
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export default cmyk;
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