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Contents
/* Convert between Lab and XYZ
/* ========================================================================== */
export function lab2lch(labL, labA, labB) {
const [ lchC, lchH ] = [
Math.sqrt(Math.pow(labA, 2) + Math.pow(labB, 2)), // convert to chroma
Math.atan2(labB, labA) * 180 / Math.PI // convert to hue, in degrees
];
return [ labL, lchC, lchH ];
}
export function lch2lab(lchL, lchC, lchH) {
// convert to Lab a and b from the polar form
const [ labA, labB ] = [
lchC * Math.cos(lchH * Math.PI / 180),
lchC * Math.sin(lchH * Math.PI / 180)
];
return [ lchL, labA, labB ];
}
/*
References
----------
- https://www.w3.org/TR/css-color-4/#lch-to-lab
- https://www.w3.org/TR/css-color-4/#color-conversion-code
/* ========================================================================== */
Version data entries
26 entries across 25 versions & 8 rubygems