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node_modules/color-space/lms.js

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+/**
+ * A responsivity of cones color space.
+ * Used for CAT - chromatic adaptation transform.
+ *
+ * http://en.wikipedia.org/wiki/LMS_color_space
+ * http://www.mathworks.com/matlabcentral/fileexchange/28790-colorspace-transformations
+ *
+ * @todo xyz -> lms
+ * @todo  tests
+ *
+ * @module color-space/lms
+ */
+import xyz from './xyz.js';
+
+var lms = {
+	name: 'lms',
+	min: [0, 0, 0],
+	max: [100, 100, 100],
+	channel: ['long', 'medium', 'short'],
+
+
+	//transform matrices
+	matrix: {
+		HPE: [
+			0.38971, 0.68898, -0.07868,
+			-0.22981, 1.18340, 0.04641,
+			0.00000, 0.00000, 1.00000],
+		VONKRIES: [
+			0.4002, 0.7076, -0.0808,
+			-0.2263, 1.1653, 0.0457,
+			0.00000, 0.00000, 0.9182],
+		BFD: [
+			0.8951, 0.2664, -0.1614,
+			-0.7502, 1.7135, 0.0367,
+			0.0389, -0.0686, 1.0296],
+		CAT97: [
+			0.8562, 0.3372, -0.1934,
+			-0.8360, 1.8327, 0.0033,
+			0.0357, -0.00469, 1.0112],
+		CAT00: [
+			0.7982, 0.3389, -0.1371,
+			-0.5918, 1.5512, 0.0406,
+			0.0008, 0.0239, 0.9753],
+		CAT02: [
+			0.7328, 0.4296, -0.1624,
+			-0.7036, 1.6975, 0.0061,
+			0.0030, 0.0136, 0.9834]
+	}
+};
+
+export default lms;
+
+lms.xyz = function (arg, matrix) {
+	var l = arg[0], m = arg[1], s = arg[2];
+
+	if (!matrix) {
+		matrix = [
+			1.096123820835514, -0.278869000218287, +0.182745179382773,
+			0.454369041975359, + 0.473533154307412, +0.072097803717229,
+			-0.009627608738429, -0.005698031216113, +1.015325639954543
+		];
+	}
+
+	return [
+		l * matrix[0] + m * matrix[1] + s * matrix[2],
+		l * matrix[3] + m * matrix[4] + s * matrix[5],
+		l * matrix[6] + m * matrix[7] + s * matrix[8]
+	];
+};
+
+xyz.lms = function (arg, matrix) {
+	var x = arg[0], y = arg[1], z = arg[2];
+
+	if (!matrix) {
+		matrix = lms.matrix.CAT02
+	}
+
+	return [
+		x * matrix[0] + y * matrix[1] + z * matrix[2],
+		x * matrix[3] + y * matrix[4] + z * matrix[5],
+		x * matrix[6] + y * matrix[7] + z * matrix[8]
+	];
+};