Initial Commit

node_modules/color-space/ydbdr.js

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+/**
+ * https://en.wikipedia.org/?title=YDbDr
+ *
+ * @module  color-space/ydbdr
+ */
+
+import rgb from './rgb.js';
+import yuv from './yuv.js';
+
+
+var ydbdr = {
+	name: 'ydbdr',
+	min: [0, -1.333, -1.333],
+	max: [1, 1.333, 1.333],
+	channel: ['Y', 'Db', 'Dr'],
+	alias: ['YDbDr']
+};
+
+
+/**
+ * YDbDr to RGB
+ *
+ * @param {Array<number>} ydbdr RGB values
+ *
+ * @return {Array<number>} YDbDr values
+ */
+ydbdr.rgb = function (ydbdr) {
+	var y = ydbdr[0], db = ydbdr[1], dr = ydbdr[2];
+
+	var r = y + 0.000092303716148 * db - 0.525912630661865 * dr;
+	var g = y - 0.129132898890509 * db + 0.267899328207599 * dr;
+	var b = y + 0.664679059978955 * db - 0.000079202543533 * dr;
+
+	return [r * 255, g * 255, b * 255];
+};
+
+
+/**
+ * RGB to YDbDr
+ *
+ * @param {Array<number>} rgb YDbDr values
+ *
+ * @return {Array<number>} RGB values
+ */
+rgb.ydbdr = function (rgb) {
+	var r = rgb[0] / 255, g = rgb[1] / 255, b = rgb[2] / 255;
+	return [
+		0.299 * r + 0.587 * g + 0.114 * b,
+		-0.450 * r - 0.883 * g + 1.333 * b,
+		-1.333 * r + 1.116 * g + 0.217 * b
+	];
+};
+
+
+/**
+ * To YUV
+ */
+yuv.ydbdr = function (yuv) {
+	return [
+		yuv[0], 3.059 * yuv[1], -2.169 * yuv[2]
+	]
+};
+
+/**
+ * From YUV
+ */
+ydbdr.yuv = function (ydbdr) {
+	return [
+		ydbdr[0], ydbdr[1] / 3.059, -ydbdr[2] / 2.169
+	]
+};
+
+
+export default (ydbdr);