colorjs.io/src/spaces/srgb-linear.js

Let’s get serious about color

import RGBColorSpace from "../RGBColorSpace.js";

/** @import { Matrix3x3 } from "../types.js" */

// This is the linear-light version of sRGB
// as used for example in SVG filters
// or in Canvas

/**
 * Matrices used by this color space, also available as `sRGB_Linear.M`
 * @type {Record<string, Matrix3x3>}
 */
// prettier-ignore
export const M = {
	// calculated directly from the RGB and white chromaticities; when rounded to
	// 8 decimal places, agrees completely with the official matrix
	// see https://github.com/w3c/csswg-drafts/issues/5922
	toXYZ: [
		[ 0.41239079926595934, 0.357584339383878,   0.1804807884018343  ],
		[ 0.21263900587151027, 0.715168678767756,   0.07219231536073371 ],
		[ 0.01933081871559182, 0.11919477979462598, 0.9505321522496607  ],
	],
	// the inverse of the above; again agrees with the official definition
	// when rounded to 8 decimal places
	fromXYZ: [
		[  3.2409699419045226,  -1.537383177570094,   -0.4986107602930034  ],
		[ -0.9692436362808796,   1.8759675015077202,   0.04155505740717559 ],
		[  0.05563007969699366, -0.20397695888897652,  1.0569715142428786  ],
	],
};

export default new RGBColorSpace({
	id: "srgb-linear",
	name: "Linear sRGB",
	white: "D65",
	M,
});