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| import { matrix } from './util';
|
| /* Convert between RGB and XYZ
| /* ========================================================================== */
|
| export function rgb2xyz(rgbR, rgbG, rgbB) {
| const [ lrgbR, lrgbB, lrgbG ] = [ rgbR, rgbG, rgbB ].map(
| v => v > 4.045 ? Math.pow((v + 5.5) / 105.5, 2.4) * 100 : v / 12.92
| );
|
| const [ xyzX, xyzY, xyzZ ] = matrix([ lrgbR, lrgbB, lrgbG ], [
| [0.4124564, 0.3575761, 0.1804375],
| [0.2126729, 0.7151522, 0.0721750],
| [0.0193339, 0.1191920, 0.9503041]
| ]);
|
| return [ xyzX, xyzY, xyzZ ];
| }
|
| export function xyz2rgb(xyzX, xyzY, xyzZ) {
| const [ lrgbR, lrgbB, lrgbG ] = matrix([ xyzX, xyzY, xyzZ ], [
| [ 3.2404542, -1.5371385, -0.4985314],
| [-0.9692660, 1.8760108, 0.0415560],
| [ 0.0556434, -0.2040259, 1.0572252]
| ]);
|
| const [ rgbR, rgbG, rgbB ] = [ lrgbR, lrgbB, lrgbG ].map(
| v => v > 0.31308 ? 1.055 * Math.pow(v / 100, 1 / 2.4) * 100 - 5.5 : 12.92 * v
| );
|
| return [ rgbR, rgbG, rgbB ];
| }
|
| /*
|
| References
| ----------
|
| - https://www.w3.org/TR/css-color-4/#rgb-to-lab
| - https://www.w3.org/TR/css-color-4/#color-conversion-code
|
| /* ========================================================================== */
|
|
