Initial Commit

node_modules/color-space/yiq.js

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+/**
+ * YIQ https://en.wikipedia.org/?title=YIQ
+ *
+ * @module  color-space/yiq
+ */
+import rgb from './rgb.js';
+
+var yiq = ({
+	name: 'yiq',
+	min: [0, -0.5957, -0.5226],
+	max: [1, 0.5957, 0.5226],
+	channel: ['Y', 'I', 'Q'],
+	alias: ['YIQ']
+});
+
+yiq.rgb = function (yiq) {
+	var y = yiq[0],
+		i = yiq[1],
+		q = yiq[2],
+		r, g, b;
+
+	r = (y * 1) + (i * 0.956) + (q * 0.621);
+	g = (y * 1) + (i * -0.272) + (q * -0.647);
+	b = (y * 1) + (i * -1.108) + (q * 1.705);
+
+	r = Math.min(Math.max(0, r), 1);
+	g = Math.min(Math.max(0, g), 1);
+	b = Math.min(Math.max(0, b), 1);
+
+	return [r * 255, g * 255, b * 255];
+};
+
+
+//extend rgb
+rgb.yiq = function (rgb) {
+	var r = rgb[0] / 255,
+		g = rgb[1] / 255,
+		b = rgb[2] / 255;
+
+
+	var y = (r * 0.299) + (g * 0.587) + (b * 0.114);
+	var i = 0, q = 0;
+	if (r !== g || g !== b) {
+		i = (r * 0.596) + (g * -0.275) + (b * -0.321);
+		q = (r * 0.212) + (g * -0.528) + (b * 0.311);
+	}
+	return [y, i, q];
+};
+
+
+export default yiq;