Initial Commit

node_modules/color-space/labh.js

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+/**
+ * Hunter-lab space.
+ *
+ * @module  color-space/labh
+ */
+
+import xyz from './xyz.js';
+
+var labh = {
+	name: 'labh',
+
+	//mins/maxes are taken from colormine
+	//FIXME: check whether mins/maxes correct
+	min: [0, -128, -128],
+	max: [100, 128, 128],
+	channel: ['lightness', 'a', 'b'],
+	alias: ['LABh', 'hunter-lab', 'hlab'],
+
+	//maths are taken from EasyRGB
+	xyz: function (lab) {
+		var l = lab[0], a = lab[1], b = lab[2];
+
+		var _y = l / 10;
+		var _x = a / 17.5 * l / 10;
+		var _z = b / 7 * l / 10;
+
+		var y = _y * _y;
+		var x = (_x + y) / 1.02;
+		var z = -(_z - y) / 0.847;
+
+		return [x, y, z];
+	}
+};
+
+export default (labh);
+
+//extend xyz
+xyz.labh = function (xyz) {
+	var x = xyz[0], y = xyz[1], z = xyz[2];
+	var _y12 = Math.sqrt(y);
+	var l = 10 * _y12;
+	var a = y === 0 ? 0 : 17.5 * (((1.02 * x) - y) / _y12);
+	var b = y === 0 ? 0 : 7 * ((y - (0.847 * z)) / _y12);
+
+	return [l, a, b];
+};