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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,52 +1,6 @@ | ||
| // https://gist.github.com/earthbound19/e7fe15fdf8ca3ef814750a61bc75b5ce | ||
| function clamp(value, min, max) { | ||
| return Math.max(Math.min(value, max), min); | ||
| } | ||
| import oklab2rgb from 'chroma-js/src/io/oklab/oklab2rgb.js'; | ||
| import rgb2oklab from 'chroma-js/src/io/oklab/rgb2oklab.js'; | ||
| import oklch2rgb from 'chroma-js/src/io/oklch/oklch2rgb.js'; | ||
| import rgb2oklch from 'chroma-js/src/io/oklch/rgb2oklch.js'; | ||
|
|
||
| const gammaToLinear = (c) => | ||
| c >= 0.04045 ? Math.pow((c + 0.055) / 1.055, 2.4) : c / 12.92; | ||
| const linearToGamma = (c) => | ||
| c >= 0.0031308 ? 1.055 * Math.pow(c, 1 / 2.4) - 0.055 : 12.92 * c; | ||
|
|
||
| export function rgb2oklab([r, g, b]) { | ||
| r = gammaToLinear(r / 255); | ||
| g = gammaToLinear(g / 255); | ||
| b = gammaToLinear(b / 255); | ||
| var l = 0.4122214708 * r + 0.5363325363 * g + 0.0514459929 * b; | ||
| var m = 0.2119034982 * r + 0.6806995451 * g + 0.1073969566 * b; | ||
| var s = 0.0883024619 * r + 0.2817188376 * g + 0.6299787005 * b; | ||
| l = Math.cbrt(l); | ||
| m = Math.cbrt(m); | ||
| s = Math.cbrt(s); | ||
| return [ | ||
| l * +0.2104542553 + m * +0.793617785 + s * -0.0040720468, | ||
| l * +1.9779984951 + m * -2.428592205 + s * +0.4505937099, | ||
| l * +0.0259040371 + m * +0.7827717662 + s * -0.808675766, | ||
| ]; | ||
| } | ||
|
|
||
| export function oklab2rgb([L, a, b]) { | ||
| var l = L + a * +0.3963377774 + b * +0.2158037573; | ||
| var m = L + a * -0.1055613458 + b * -0.0638541728; | ||
| var s = L + a * -0.0894841775 + b * -1.291485548; | ||
| // The ** operator here cubes; same as l_*l_*l_ in the C++ example: | ||
| l = l ** 3; | ||
| m = m ** 3; | ||
| s = s ** 3; | ||
| var r = l * +4.0767416621 + m * -3.3077115913 + s * +0.2309699292; | ||
| var g = l * -1.2684380046 + m * +2.6097574011 + s * -0.3413193965; | ||
| var b = l * -0.0041960863 + m * -0.7034186147 + s * +1.707614701; | ||
| // Convert linear RGB values returned from oklab math to sRGB for our use before returning them: | ||
| r = 255 * linearToGamma(r); | ||
| g = 255 * linearToGamma(g); | ||
| b = 255 * linearToGamma(b); | ||
| // OPTION: clamp r g and b values to the range 0-255; but if you use the values immediately to draw, JavaScript clamps them on use: | ||
| r = clamp(r, 0, 255); | ||
| g = clamp(g, 0, 255); | ||
| b = clamp(b, 0, 255); | ||
| // OPTION: round the values. May not be necessary if you use them immediately for rendering in JavaScript, as JavaScript (also) discards decimals on render: | ||
| r = Math.round(r); | ||
| g = Math.round(g); | ||
| b = Math.round(b); | ||
| return [r, g, b]; | ||
| } | ||
| export { oklab2rgb, rgb2oklab, oklch2rgb, rgb2oklch }; |