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color-bundle

Color conversion and manipulation with CSS string support (bundle)

Dette script bør ikke installeres direkte. Det er et bibliotek, som andre scripts kan inkludere med metadirektivet // @require https://update.greasyfork.org/scripts/387811/719499/color-bundle.js 

// Modified bundle of github.com/Qix-/color v3.1.2
var Color = (function () {
	'use strict';

	var cssKeywords = {
		"aliceblue": [240, 248, 255],
		"antiquewhite": [250, 235, 215],
		"aqua": [0, 255, 255],
		"aquamarine": [127, 255, 212],
		"azure": [240, 255, 255],
		"beige": [245, 245, 220],
		"bisque": [255, 228, 196],
		"black": [0, 0, 0],
		"blanchedalmond": [255, 235, 205],
		"blue": [0, 0, 255],
		"blueviolet": [138, 43, 226],
		"brown": [165, 42, 42],
		"burlywood": [222, 184, 135],
		"cadetblue": [95, 158, 160],
		"chartreuse": [127, 255, 0],
		"chocolate": [210, 105, 30],
		"coral": [255, 127, 80],
		"cornflowerblue": [100, 149, 237],
		"cornsilk": [255, 248, 220],
		"crimson": [220, 20, 60],
		"cyan": [0, 255, 255],
		"darkblue": [0, 0, 139],
		"darkcyan": [0, 139, 139],
		"darkgoldenrod": [184, 134, 11],
		"darkgray": [169, 169, 169],
		"darkgreen": [0, 100, 0],
		"darkgrey": [169, 169, 169],
		"darkkhaki": [189, 183, 107],
		"darkmagenta": [139, 0, 139],
		"darkolivegreen": [85, 107, 47],
		"darkorange": [255, 140, 0],
		"darkorchid": [153, 50, 204],
		"darkred": [139, 0, 0],
		"darksalmon": [233, 150, 122],
		"darkseagreen": [143, 188, 143],
		"darkslateblue": [72, 61, 139],
		"darkslategray": [47, 79, 79],
		"darkslategrey": [47, 79, 79],
		"darkturquoise": [0, 206, 209],
		"darkviolet": [148, 0, 211],
		"deeppink": [255, 20, 147],
		"deepskyblue": [0, 191, 255],
		"dimgray": [105, 105, 105],
		"dimgrey": [105, 105, 105],
		"dodgerblue": [30, 144, 255],
		"firebrick": [178, 34, 34],
		"floralwhite": [255, 250, 240],
		"forestgreen": [34, 139, 34],
		"fuchsia": [255, 0, 255],
		"gainsboro": [220, 220, 220],
		"ghostwhite": [248, 248, 255],
		"gold": [255, 215, 0],
		"goldenrod": [218, 165, 32],
		"gray": [128, 128, 128],
		"green": [0, 128, 0],
		"greenyellow": [173, 255, 47],
		"grey": [128, 128, 128],
		"honeydew": [240, 255, 240],
		"hotpink": [255, 105, 180],
		"indianred": [205, 92, 92],
		"indigo": [75, 0, 130],
		"ivory": [255, 255, 240],
		"khaki": [240, 230, 140],
		"lavender": [230, 230, 250],
		"lavenderblush": [255, 240, 245],
		"lawngreen": [124, 252, 0],
		"lemonchiffon": [255, 250, 205],
		"lightblue": [173, 216, 230],
		"lightcoral": [240, 128, 128],
		"lightcyan": [224, 255, 255],
		"lightgoldenrodyellow": [250, 250, 210],
		"lightgray": [211, 211, 211],
		"lightgreen": [144, 238, 144],
		"lightgrey": [211, 211, 211],
		"lightpink": [255, 182, 193],
		"lightsalmon": [255, 160, 122],
		"lightseagreen": [32, 178, 170],
		"lightskyblue": [135, 206, 250],
		"lightslategray": [119, 136, 153],
		"lightslategrey": [119, 136, 153],
		"lightsteelblue": [176, 196, 222],
		"lightyellow": [255, 255, 224],
		"lime": [0, 255, 0],
		"limegreen": [50, 205, 50],
		"linen": [250, 240, 230],
		"magenta": [255, 0, 255],
		"maroon": [128, 0, 0],
		"mediumaquamarine": [102, 205, 170],
		"mediumblue": [0, 0, 205],
		"mediumorchid": [186, 85, 211],
		"mediumpurple": [147, 112, 219],
		"mediumseagreen": [60, 179, 113],
		"mediumslateblue": [123, 104, 238],
		"mediumspringgreen": [0, 250, 154],
		"mediumturquoise": [72, 209, 204],
		"mediumvioletred": [199, 21, 133],
		"midnightblue": [25, 25, 112],
		"mintcream": [245, 255, 250],
		"mistyrose": [255, 228, 225],
		"moccasin": [255, 228, 181],
		"navajowhite": [255, 222, 173],
		"navy": [0, 0, 128],
		"oldlace": [253, 245, 230],
		"olive": [128, 128, 0],
		"olivedrab": [107, 142, 35],
		"orange": [255, 165, 0],
		"orangered": [255, 69, 0],
		"orchid": [218, 112, 214],
		"palegoldenrod": [238, 232, 170],
		"palegreen": [152, 251, 152],
		"paleturquoise": [175, 238, 238],
		"palevioletred": [219, 112, 147],
		"papayawhip": [255, 239, 213],
		"peachpuff": [255, 218, 185],
		"peru": [205, 133, 63],
		"pink": [255, 192, 203],
		"plum": [221, 160, 221],
		"powderblue": [176, 224, 230],
		"purple": [128, 0, 128],
		"rebeccapurple": [102, 51, 153],
		"red": [255, 0, 0],
		"rosybrown": [188, 143, 143],
		"royalblue": [65, 105, 225],
		"saddlebrown": [139, 69, 19],
		"salmon": [250, 128, 114],
		"sandybrown": [244, 164, 96],
		"seagreen": [46, 139, 87],
		"seashell": [255, 245, 238],
		"sienna": [160, 82, 45],
		"silver": [192, 192, 192],
		"skyblue": [135, 206, 235],
		"slateblue": [106, 90, 205],
		"slategray": [112, 128, 144],
		"slategrey": [112, 128, 144],
		"snow": [255, 250, 250],
		"springgreen": [0, 255, 127],
		"steelblue": [70, 130, 180],
		"tan": [210, 180, 140],
		"teal": [0, 128, 128],
		"thistle": [216, 191, 216],
		"tomato": [255, 99, 71],
		"turquoise": [64, 224, 208],
		"violet": [238, 130, 238],
		"wheat": [245, 222, 179],
		"white": [255, 255, 255],
		"whitesmoke": [245, 245, 245],
		"yellow": [255, 255, 0],
		"yellowgreen": [154, 205, 50]
	};

	var isArrayish = (function isArrayish(obj) {
		if (!obj || typeof obj === 'string') {
			return false;
		}

		return obj instanceof Array || Array.isArray(obj) ||
			(obj.length >= 0 && (obj.splice instanceof Function ||
				(Object.getOwnPropertyDescriptor(obj, (obj.length - 1)) && obj.constructor.name !== 'String')));
	});

	var concat = Array.prototype.concat;
	var slice = Array.prototype.slice;

	var swizzle = function swizzle(args) {
		var results = [];

		for (var i = 0, len = args.length; i < len; i++) {
			var arg = args[i];

			if (isArrayish(arg)) {
				// http://jsperf.com/javascript-array-concat-vs-push/98
				results = concat.call(results, slice.call(arg));
			} else {
				results.push(arg);
			}
		}

		return results;
	};

	swizzle.wrap = function (fn) {
		return function () {
			return fn(swizzle(arguments));
		};
	};

	/* MIT license */

	var reverseNames = {};

	// create a list of reverse color names
	for (var name in cssKeywords) {
		if (cssKeywords.hasOwnProperty(name)) {
			reverseNames[cssKeywords[name]] = name;
		}
	}

	var cs = {
		to: {},
		get: {}
	};

	cs.get = function (string) {
		var prefix = string.substring(0, 3).toLowerCase();
		var val;
		var model;
		switch (prefix) {
			case 'hsl':
				val = cs.get.hsl(string);
				model = 'hsl';
				break;
			case 'hwb':
				val = cs.get.hwb(string);
				model = 'hwb';
				break;
			default:
				val = cs.get.rgb(string);
				model = 'rgb';
				break;
		}

		if (!val) {
			return null;
		}

		return {model: model, value: val};
	};

	cs.get.rgb = function (string) {
		if (!string) {
			return null;
		}

		var abbr = /^#([a-f0-9]{3,4})$/i;
		var hex = /^#([a-f0-9]{6})([a-f0-9]{2})?$/i;
		var rgba = /^rgba?\(\s*([+-]?\d+)\s*,\s*([+-]?\d+)\s*,\s*([+-]?\d+)\s*(?:,\s*([+-]?[\d\.]+)\s*)?\)$/;
		var per = /^rgba?\(\s*([+-]?[\d\.]+)\%\s*,\s*([+-]?[\d\.]+)\%\s*,\s*([+-]?[\d\.]+)\%\s*(?:,\s*([+-]?[\d\.]+)\s*)?\)$/;
		var keyword = /(\D+)/;

		var rgb = [0, 0, 0, 1];
		var match;
		var i;
		var hexAlpha;

		if (match = string.match(hex)) {
			hexAlpha = match[2];
			match = match[1];

			for (i = 0; i < 3; i++) {
				// https://jsperf.com/slice-vs-substr-vs-substring-methods-long-string/19
				var i2 = i * 2;
				rgb[i] = parseInt(match.slice(i2, i2 + 2), 16);
			}

			if (hexAlpha) {
				rgb[3] = Math.round((parseInt(hexAlpha, 16) / 255) * 100) / 100;
			}
		} else if (match = string.match(abbr)) {
			match = match[1];
			hexAlpha = match[3];

			for (i = 0; i < 3; i++) {
				rgb[i] = parseInt(match[i] + match[i], 16);
			}

			if (hexAlpha) {
				rgb[3] = Math.round((parseInt(hexAlpha + hexAlpha, 16) / 255) * 100) / 100;
			}
		} else if (match = string.match(rgba)) {
			for (i = 0; i < 3; i++) {
				rgb[i] = parseInt(match[i + 1], 0);
			}

			if (match[4]) {
				rgb[3] = parseFloat(match[4]);
			}
		} else if (match = string.match(per)) {
			for (i = 0; i < 3; i++) {
				rgb[i] = Math.round(parseFloat(match[i + 1]) * 2.55);
			}

			if (match[4]) {
				rgb[3] = parseFloat(match[4]);
			}
		} else if (match = string.match(keyword)) {
			if (match[1] === 'transparent') {
				return [0, 0, 0, 0];
			}

			rgb = cssKeywords[match[1]];

			if (!rgb) {
				return null;
			}

			rgb[3] = 1;

			return rgb;
		} else {
			return null;
		}

		for (i = 0; i < 3; i++) {
			rgb[i] = clamp(rgb[i], 0, 255);
		}
		rgb[3] = clamp(rgb[3], 0, 1);

		return rgb;
	};

	cs.get.hsl = function (string) {
		if (!string) {
			return null;
		}

		var hsl = /^hsla?\(\s*([+-]?(?:\d*\.)?\d+)(?:deg)?\s*,\s*([+-]?[\d\.]+)%\s*,\s*([+-]?[\d\.]+)%\s*(?:,\s*([+-]?[\d\.]+)\s*)?\)$/;
		var match = string.match(hsl);

		if (match) {
			var alpha = parseFloat(match[4]);
			var h = (parseFloat(match[1]) + 360) % 360;
			var s = clamp(parseFloat(match[2]), 0, 100);
			var l = clamp(parseFloat(match[3]), 0, 100);
			var a = clamp(isNaN(alpha) ? 1 : alpha, 0, 1);

			return [h, s, l, a];
		}

		return null;
	};

	cs.get.hwb = function (string) {
		if (!string) {
			return null;
		}

		var hwb = /^hwb\(\s*([+-]?\d*[\.]?\d+)(?:deg)?\s*,\s*([+-]?[\d\.]+)%\s*,\s*([+-]?[\d\.]+)%\s*(?:,\s*([+-]?[\d\.]+)\s*)?\)$/;
		var match = string.match(hwb);

		if (match) {
			var alpha = parseFloat(match[4]);
			var h = ((parseFloat(match[1]) % 360) + 360) % 360;
			var w = clamp(parseFloat(match[2]), 0, 100);
			var b = clamp(parseFloat(match[3]), 0, 100);
			var a = clamp(isNaN(alpha) ? 1 : alpha, 0, 1);
			return [h, w, b, a];
		}

		return null;
	};

	cs.to.hex = function () {
		var rgba = swizzle(arguments);

		return (
			'#' +
			hexDouble(rgba[0]) +
			hexDouble(rgba[1]) +
			hexDouble(rgba[2]) +
			(rgba[3] < 1
				? (hexDouble(Math.round(rgba[3] * 255)))
				: '')
		);
	};

	cs.to.rgb = function () {
		var rgba = swizzle(arguments);

		return rgba.length < 4 || rgba[3] === 1
			? 'rgb(' + Math.round(rgba[0]) + ', ' + Math.round(rgba[1]) + ', ' + Math.round(rgba[2]) + ')'
			: 'rgba(' + Math.round(rgba[0]) + ', ' + Math.round(rgba[1]) + ', ' + Math.round(rgba[2]) + ', ' + rgba[3] + ')';
	};

	cs.to.rgb.percent = function () {
		var rgba = swizzle(arguments);

		var r = Math.round(rgba[0] / 255 * 100);
		var g = Math.round(rgba[1] / 255 * 100);
		var b = Math.round(rgba[2] / 255 * 100);

		return rgba.length < 4 || rgba[3] === 1
			? 'rgb(' + r + '%, ' + g + '%, ' + b + '%)'
			: 'rgba(' + r + '%, ' + g + '%, ' + b + '%, ' + rgba[3] + ')';
	};

	cs.to.hsl = function () {
		var hsla = swizzle(arguments);
		return hsla.length < 4 || hsla[3] === 1
			? 'hsl(' + hsla[0] + ', ' + hsla[1] + '%, ' + hsla[2] + '%)'
			: 'hsla(' + hsla[0] + ', ' + hsla[1] + '%, ' + hsla[2] + '%, ' + hsla[3] + ')';
	};

	// hwb is a bit different than rgb(a) & hsl(a) since there is no alpha specific syntax
	// (hwb have alpha optional & 1 is default value)
	cs.to.hwb = function () {
		var hwba = swizzle(arguments);

		var a = '';
		if (hwba.length >= 4 && hwba[3] !== 1) {
			a = ', ' + hwba[3];
		}

		return 'hwb(' + hwba[0] + ', ' + hwba[1] + '%, ' + hwba[2] + '%' + a + ')';
	};

	cs.to.keyword = function (rgb) {
		return reverseNames[rgb.slice(0, 3)];
	};

	// helpers
	function clamp(num, min, max) {
		return Math.min(Math.max(min, num), max);
	}

	function hexDouble(num) {
		var str = num.toString(16).toUpperCase();
		return (str.length < 2) ? '0' + str : str;
	}

	/* MIT license */

	// NOTE: conversions should only return primitive values (i.e. arrays, or
	//       values that give correct `typeof` results).
	//       do not use box values types (i.e. Number(), String(), etc.)

	var reverseKeywords = {};
	for (var key in cssKeywords) {
		if (cssKeywords.hasOwnProperty(key)) {
			reverseKeywords[cssKeywords[key]] = key;
		}
	}

	var convert = {
		rgb: {channels: 3, labels: 'rgb'},
		hsl: {channels: 3, labels: 'hsl'},
		hsv: {channels: 3, labels: 'hsv'},
		hwb: {channels: 3, labels: 'hwb'},
		cmyk: {channels: 4, labels: 'cmyk'},
		xyz: {channels: 3, labels: 'xyz'},
		lab: {channels: 3, labels: 'lab'},
		lch: {channels: 3, labels: 'lch'},
		hex: {channels: 1, labels: ['hex']},
		keyword: {channels: 1, labels: ['keyword']},
		ansi16: {channels: 1, labels: ['ansi16']},
		ansi256: {channels: 1, labels: ['ansi256']},
		hcg: {channels: 3, labels: ['h', 'c', 'g']},
		apple: {channels: 3, labels: ['r16', 'g16', 'b16']},
		gray: {channels: 1, labels: ['gray']}
	};

	// hide .channels and .labels properties
	for (var model in convert) {
		if (convert.hasOwnProperty(model)) {
			if (!('channels' in convert[model])) {
				throw new Error('missing channels property: ' + model);
			}

			if (!('labels' in convert[model])) {
				throw new Error('missing channel labels property: ' + model);
			}

			if (convert[model].labels.length !== convert[model].channels) {
				throw new Error('channel and label counts mismatch: ' + model);
			}

			var channels = convert[model].channels;
			var labels = convert[model].labels;
			delete convert[model].channels;
			delete convert[model].labels;
			Object.defineProperty(convert[model], 'channels', {value: channels});
			Object.defineProperty(convert[model], 'labels', {value: labels});
		}
	}

	convert.rgb.hsl = function (rgb) {
		var r = rgb[0] / 255;
		var g = rgb[1] / 255;
		var b = rgb[2] / 255;
		var min = Math.min(r, g, b);
		var max = Math.max(r, g, b);
		var delta = max - min;
		var h;
		var s;
		var l;

		if (max === min) {
			h = 0;
		} else if (r === max) {
			h = (g - b) / delta;
		} else if (g === max) {
			h = 2 + (b - r) / delta;
		} else if (b === max) {
			h = 4 + (r - g) / delta;
		}

		h = Math.min(h * 60, 360);

		if (h < 0) {
			h += 360;
		}

		l = (min + max) / 2;

		if (max === min) {
			s = 0;
		} else if (l <= 0.5) {
			s = delta / (max + min);
		} else {
			s = delta / (2 - max - min);
		}

		return [h, s * 100, l * 100];
	};

	convert.rgb.hsv = function (rgb) {
		var rdif;
		var gdif;
		var bdif;
		var h;
		var s;

		var r = rgb[0] / 255;
		var g = rgb[1] / 255;
		var b = rgb[2] / 255;
		var v = Math.max(r, g, b);
		var diff = v - Math.min(r, g, b);
		var diffc = function (c) {
			return (v - c) / 6 / diff + 1 / 2;
		};

		if (diff === 0) {
			h = s = 0;
		} else {
			s = diff / v;
			rdif = diffc(r);
			gdif = diffc(g);
			bdif = diffc(b);

			if (r === v) {
				h = bdif - gdif;
			} else if (g === v) {
				h = (1 / 3) + rdif - bdif;
			} else if (b === v) {
				h = (2 / 3) + gdif - rdif;
			}
			if (h < 0) {
				h += 1;
			} else if (h > 1) {
				h -= 1;
			}
		}

		return [
			h * 360,
			s * 100,
			v * 100
		];
	};

	convert.rgb.hwb = function (rgb) {
		var r = rgb[0];
		var g = rgb[1];
		var b = rgb[2];
		var h = convert.rgb.hsl(rgb)[0];
		var w = 1 / 255 * Math.min(r, Math.min(g, b));

		b = 1 - 1 / 255 * Math.max(r, Math.max(g, b));

		return [h, w * 100, b * 100];
	};

	convert.rgb.cmyk = function (rgb) {
		var r = rgb[0] / 255;
		var g = rgb[1] / 255;
		var b = rgb[2] / 255;
		var c;
		var m;
		var y;
		var k;

		k = Math.min(1 - r, 1 - g, 1 - b);
		c = (1 - r - k) / (1 - k) || 0;
		m = (1 - g - k) / (1 - k) || 0;
		y = (1 - b - k) / (1 - k) || 0;

		return [c * 100, m * 100, y * 100, k * 100];
	};

	/**
	 * See https://en.m.wikipedia.org/wiki/Euclidean_distance#Squared_Euclidean_distance
	 * */
	function comparativeDistance(x, y) {
		return (
			Math.pow(x[0] - y[0], 2) +
			Math.pow(x[1] - y[1], 2) +
			Math.pow(x[2] - y[2], 2)
		);
	}

	convert.rgb.keyword = function (rgb) {
		var reversed = reverseKeywords[rgb];
		if (reversed) {
			return reversed;
		}

		var currentClosestDistance = Infinity;
		var currentClosestKeyword;

		for (var keyword in cssKeywords) {
			if (cssKeywords.hasOwnProperty(keyword)) {
				var value = cssKeywords[keyword];

				// Compute comparative distance
				var distance = comparativeDistance(rgb, value);

				// Check if its less, if so set as closest
				if (distance < currentClosestDistance) {
					currentClosestDistance = distance;
					currentClosestKeyword = keyword;
				}
			}
		}

		return currentClosestKeyword;
	};

	convert.keyword.rgb = function (keyword) {
		return cssKeywords[keyword];
	};

	convert.rgb.xyz = function (rgb) {
		var r = rgb[0] / 255;
		var g = rgb[1] / 255;
		var b = rgb[2] / 255;

		// assume sRGB
		r = r > 0.04045 ? Math.pow(((r + 0.055) / 1.055), 2.4) : (r / 12.92);
		g = g > 0.04045 ? Math.pow(((g + 0.055) / 1.055), 2.4) : (g / 12.92);
		b = b > 0.04045 ? Math.pow(((b + 0.055) / 1.055), 2.4) : (b / 12.92);

		var x = (r * 0.4124) + (g * 0.3576) + (b * 0.1805);
		var y = (r * 0.2126) + (g * 0.7152) + (b * 0.0722);
		var z = (r * 0.0193) + (g * 0.1192) + (b * 0.9505);

		return [x * 100, y * 100, z * 100];
	};

	convert.rgb.lab = function (rgb) {
		var xyz = convert.rgb.xyz(rgb);
		var x = xyz[0];
		var y = xyz[1];
		var z = xyz[2];
		var l;
		var a;
		var b;

		x /= 95.047;
		y /= 100;
		z /= 108.883;

		x = x > 0.008856 ? Math.pow(x, 1 / 3) : (7.787 * x) + (16 / 116);
		y = y > 0.008856 ? Math.pow(y, 1 / 3) : (7.787 * y) + (16 / 116);
		z = z > 0.008856 ? Math.pow(z, 1 / 3) : (7.787 * z) + (16 / 116);

		l = (116 * y) - 16;
		a = 500 * (x - y);
		b = 200 * (y - z);

		return [l, a, b];
	};

	convert.hsl.rgb = function (hsl) {
		var h = hsl[0] / 360;
		var s = hsl[1] / 100;
		var l = hsl[2] / 100;
		var t1;
		var t2;
		var t3;
		var rgb;
		var val;

		if (s === 0) {
			val = l * 255;
			return [val, val, val];
		}

		if (l < 0.5) {
			t2 = l * (1 + s);
		} else {
			t2 = l + s - l * s;
		}

		t1 = 2 * l - t2;

		rgb = [0, 0, 0];
		for (var i = 0; i < 3; i++) {
			t3 = h + 1 / 3 * -(i - 1);
			if (t3 < 0) {
				t3++;
			}
			if (t3 > 1) {
				t3--;
			}

			if (6 * t3 < 1) {
				val = t1 + (t2 - t1) * 6 * t3;
			} else if (2 * t3 < 1) {
				val = t2;
			} else if (3 * t3 < 2) {
				val = t1 + (t2 - t1) * (2 / 3 - t3) * 6;
			} else {
				val = t1;
			}

			rgb[i] = val * 255;
		}

		return rgb;
	};

	convert.hsl.hsv = function (hsl) {
		var h = hsl[0];
		var s = hsl[1] / 100;
		var l = hsl[2] / 100;
		var smin = s;
		var lmin = Math.max(l, 0.01);
		var sv;
		var v;

		l *= 2;
		s *= (l <= 1) ? l : 2 - l;
		smin *= lmin <= 1 ? lmin : 2 - lmin;
		v = (l + s) / 2;
		sv = l === 0 ? (2 * smin) / (lmin + smin) : (2 * s) / (l + s);

		return [h, sv * 100, v * 100];
	};

	convert.hsv.rgb = function (hsv) {
		var h = hsv[0] / 60;
		var s = hsv[1] / 100;
		var v = hsv[2] / 100;
		var hi = Math.floor(h) % 6;

		var f = h - Math.floor(h);
		var p = 255 * v * (1 - s);
		var q = 255 * v * (1 - (s * f));
		var t = 255 * v * (1 - (s * (1 - f)));
		v *= 255;

		switch (hi) {
			case 0:
				return [v, t, p];
			case 1:
				return [q, v, p];
			case 2:
				return [p, v, t];
			case 3:
				return [p, q, v];
			case 4:
				return [t, p, v];
			case 5:
				return [v, p, q];
		}
	};

	convert.hsv.hsl = function (hsv) {
		var h = hsv[0];
		var s = hsv[1] / 100;
		var v = hsv[2] / 100;
		var vmin = Math.max(v, 0.01);
		var lmin;
		var sl;
		var l;

		l = (2 - s) * v;
		lmin = (2 - s) * vmin;
		sl = s * vmin;
		sl /= (lmin <= 1) ? lmin : 2 - lmin;
		sl = sl || 0;
		l /= 2;

		return [h, sl * 100, l * 100];
	};

	// http://dev.w3.org/csswg/css-color/#hwb-to-rgb
	convert.hwb.rgb = function (hwb) {
		var h = hwb[0] / 360;
		var wh = hwb[1] / 100;
		var bl = hwb[2] / 100;
		var ratio = wh + bl;
		var i;
		var v;
		var f;
		var n;

		// wh + bl cant be > 1
		if (ratio > 1) {
			wh /= ratio;
			bl /= ratio;
		}

		i = Math.floor(6 * h);
		v = 1 - bl;
		f = 6 * h - i;

		if ((i & 0x01) !== 0) {
			f = 1 - f;
		}

		n = wh + f * (v - wh); // linear interpolation

		var r;
		var g;
		var b;
		switch (i) {
			default:
			case 6:
			case 0: r = v; g = n; b = wh; break;
			case 1: r = n; g = v; b = wh; break;
			case 2: r = wh; g = v; b = n; break;
			case 3: r = wh; g = n; b = v; break;
			case 4: r = n; g = wh; b = v; break;
			case 5: r = v; g = wh; b = n; break;
		}

		return [r * 255, g * 255, b * 255];
	};

	convert.cmyk.rgb = function (cmyk) {
		var c = cmyk[0] / 100;
		var m = cmyk[1] / 100;
		var y = cmyk[2] / 100;
		var k = cmyk[3] / 100;
		var r;
		var g;
		var b;

		r = 1 - Math.min(1, c * (1 - k) + k);
		g = 1 - Math.min(1, m * (1 - k) + k);
		b = 1 - Math.min(1, y * (1 - k) + k);

		return [r * 255, g * 255, b * 255];
	};

	convert.xyz.rgb = function (xyz) {
		var x = xyz[0] / 100;
		var y = xyz[1] / 100;
		var z = xyz[2] / 100;
		var r;
		var g;
		var b;

		r = (x * 3.2406) + (y * -1.5372) + (z * -0.4986);
		g = (x * -0.9689) + (y * 1.8758) + (z * 0.0415);
		b = (x * 0.0557) + (y * -0.2040) + (z * 1.0570);

		// assume sRGB
		r = r > 0.0031308
			? ((1.055 * Math.pow(r, 1.0 / 2.4)) - 0.055)
			: r * 12.92;

		g = g > 0.0031308
			? ((1.055 * Math.pow(g, 1.0 / 2.4)) - 0.055)
			: g * 12.92;

		b = b > 0.0031308
			? ((1.055 * Math.pow(b, 1.0 / 2.4)) - 0.055)
			: b * 12.92;

		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];
	};

	convert.xyz.lab = function (xyz) {
		var x = xyz[0];
		var y = xyz[1];
		var z = xyz[2];
		var l;
		var a;
		var b;

		x /= 95.047;
		y /= 100;
		z /= 108.883;

		x = x > 0.008856 ? Math.pow(x, 1 / 3) : (7.787 * x) + (16 / 116);
		y = y > 0.008856 ? Math.pow(y, 1 / 3) : (7.787 * y) + (16 / 116);
		z = z > 0.008856 ? Math.pow(z, 1 / 3) : (7.787 * z) + (16 / 116);

		l = (116 * y) - 16;
		a = 500 * (x - y);
		b = 200 * (y - z);

		return [l, a, b];
	};

	convert.lab.xyz = function (lab) {
		var l = lab[0];
		var a = lab[1];
		var b = lab[2];
		var x;
		var y;
		var z;

		y = (l + 16) / 116;
		x = a / 500 + y;
		z = y - b / 200;

		var y2 = Math.pow(y, 3);
		var x2 = Math.pow(x, 3);
		var z2 = Math.pow(z, 3);
		y = y2 > 0.008856 ? y2 : (y - 16 / 116) / 7.787;
		x = x2 > 0.008856 ? x2 : (x - 16 / 116) / 7.787;
		z = z2 > 0.008856 ? z2 : (z - 16 / 116) / 7.787;

		x *= 95.047;
		y *= 100;
		z *= 108.883;

		return [x, y, z];
	};

	convert.lab.lch = function (lab) {
		var l = lab[0];
		var a = lab[1];
		var b = lab[2];
		var hr;
		var h;
		var c;

		hr = Math.atan2(b, a);
		h = hr * 360 / 2 / Math.PI;

		if (h < 0) {
			h += 360;
		}

		c = Math.sqrt(a * a + b * b);

		return [l, c, h];
	};

	convert.lch.lab = function (lch) {
		var l = lch[0];
		var c = lch[1];
		var h = lch[2];
		var a;
		var b;
		var hr;

		hr = h / 360 * 2 * Math.PI;
		a = c * Math.cos(hr);
		b = c * Math.sin(hr);

		return [l, a, b];
	};

	convert.rgb.ansi16 = function (args) {
		var r = args[0];
		var g = args[1];
		var b = args[2];
		var value = 1 in arguments ? arguments[1] : convert.rgb.hsv(args)[2]; // hsv -> ansi16 optimization

		value = Math.round(value / 50);

		if (value === 0) {
			return 30;
		}

		var ansi = 30
			+ ((Math.round(b / 255) << 2)
			| (Math.round(g / 255) << 1)
			| Math.round(r / 255));

		if (value === 2) {
			ansi += 60;
		}

		return ansi;
	};

	convert.hsv.ansi16 = function (args) {
		// optimization here; we already know the value and don't need to get
		// it converted for us.
		return convert.rgb.ansi16(convert.hsv.rgb(args), args[2]);
	};

	convert.rgb.ansi256 = function (args) {
		var r = args[0];
		var g = args[1];
		var b = args[2];

		// we use the extended greyscale palette here, with the exception of
		// black and white. normal palette only has 4 greyscale shades.
		if (r === g && g === b) {
			if (r < 8) {
				return 16;
			}

			if (r > 248) {
				return 231;
			}

			return Math.round(((r - 8) / 247) * 24) + 232;
		}

		var ansi = 16
			+ (36 * Math.round(r / 255 * 5))
			+ (6 * Math.round(g / 255 * 5))
			+ Math.round(b / 255 * 5);

		return ansi;
	};

	convert.ansi16.rgb = function (args) {
		var color = args % 10;

		// handle greyscale
		if (color === 0 || color === 7) {
			if (args > 50) {
				color += 3.5;
			}

			color = color / 10.5 * 255;

			return [color, color, color];
		}

		var mult = (~~(args > 50) + 1) * 0.5;
		var r = ((color & 1) * mult) * 255;
		var g = (((color >> 1) & 1) * mult) * 255;
		var b = (((color >> 2) & 1) * mult) * 255;

		return [r, g, b];
	};

	convert.ansi256.rgb = function (args) {
		// handle greyscale
		if (args >= 232) {
			var c = (args - 232) * 10 + 8;
			return [c, c, c];
		}

		args -= 16;

		var rem;
		var r = Math.floor(args / 36) / 5 * 255;
		var g = Math.floor((rem = args % 36) / 6) / 5 * 255;
		var b = (rem % 6) / 5 * 255;

		return [r, g, b];
	};

	convert.rgb.hex = function (args) {
		var integer = ((Math.round(args[0]) & 0xFF) << 16)
			+ ((Math.round(args[1]) & 0xFF) << 8)
			+ (Math.round(args[2]) & 0xFF);

		var string = integer.toString(16).toUpperCase();
		return '000000'.substring(string.length) + string;
	};

	convert.hex.rgb = function (args) {
		var match = args.toString(16).match(/[a-f0-9]{6}|[a-f0-9]{3}/i);
		if (!match) {
			return [0, 0, 0];
		}

		var colorString = match[0];

		if (match[0].length === 3) {
			colorString = colorString.split('').map(function (char) {
				return char + char;
			}).join('');
		}

		var integer = parseInt(colorString, 16);
		var r = (integer >> 16) & 0xFF;
		var g = (integer >> 8) & 0xFF;
		var b = integer & 0xFF;

		return [r, g, b];
	};

	convert.rgb.hcg = function (rgb) {
		var r = rgb[0] / 255;
		var g = rgb[1] / 255;
		var b = rgb[2] / 255;
		var max = Math.max(Math.max(r, g), b);
		var min = Math.min(Math.min(r, g), b);
		var chroma = (max - min);
		var grayscale;
		var hue;

		if (chroma < 1) {
			grayscale = min / (1 - chroma);
		} else {
			grayscale = 0;
		}

		if (chroma <= 0) {
			hue = 0;
		} else
		if (max === r) {
			hue = ((g - b) / chroma) % 6;
		} else
		if (max === g) {
			hue = 2 + (b - r) / chroma;
		} else {
			hue = 4 + (r - g) / chroma + 4;
		}

		hue /= 6;
		hue %= 1;

		return [hue * 360, chroma * 100, grayscale * 100];
	};

	convert.hsl.hcg = function (hsl) {
		var s = hsl[1] / 100;
		var l = hsl[2] / 100;
		var c = 1;
		var f = 0;

		if (l < 0.5) {
			c = 2.0 * s * l;
		} else {
			c = 2.0 * s * (1.0 - l);
		}

		if (c < 1.0) {
			f = (l - 0.5 * c) / (1.0 - c);
		}

		return [hsl[0], c * 100, f * 100];
	};

	convert.hsv.hcg = function (hsv) {
		var s = hsv[1] / 100;
		var v = hsv[2] / 100;

		var c = s * v;
		var f = 0;

		if (c < 1.0) {
			f = (v - c) / (1 - c);
		}

		return [hsv[0], c * 100, f * 100];
	};

	convert.hcg.rgb = function (hcg) {
		var h = hcg[0] / 360;
		var c = hcg[1] / 100;
		var g = hcg[2] / 100;

		if (c === 0.0) {
			return [g * 255, g * 255, g * 255];
		}

		var pure = [0, 0, 0];
		var hi = (h % 1) * 6;
		var v = hi % 1;
		var w = 1 - v;
		var mg = 0;

		switch (Math.floor(hi)) {
			case 0:
				pure[0] = 1; pure[1] = v; pure[2] = 0; break;
			case 1:
				pure[0] = w; pure[1] = 1; pure[2] = 0; break;
			case 2:
				pure[0] = 0; pure[1] = 1; pure[2] = v; break;
			case 3:
				pure[0] = 0; pure[1] = w; pure[2] = 1; break;
			case 4:
				pure[0] = v; pure[1] = 0; pure[2] = 1; break;
			default:
				pure[0] = 1; pure[1] = 0; pure[2] = w;
		}

		mg = (1.0 - c) * g;

		return [
			(c * pure[0] + mg) * 255,
			(c * pure[1] + mg) * 255,
			(c * pure[2] + mg) * 255
		];
	};

	convert.hcg.hsv = function (hcg) {
		var c = hcg[1] / 100;
		var g = hcg[2] / 100;

		var v = c + g * (1.0 - c);
		var f = 0;

		if (v > 0.0) {
			f = c / v;
		}

		return [hcg[0], f * 100, v * 100];
	};

	convert.hcg.hsl = function (hcg) {
		var c = hcg[1] / 100;
		var g = hcg[2] / 100;

		var l = g * (1.0 - c) + 0.5 * c;
		var s = 0;

		if (l > 0.0 && l < 0.5) {
			s = c / (2 * l);
		} else
		if (l >= 0.5 && l < 1.0) {
			s = c / (2 * (1 - l));
		}

		return [hcg[0], s * 100, l * 100];
	};

	convert.hcg.hwb = function (hcg) {
		var c = hcg[1] / 100;
		var g = hcg[2] / 100;
		var v = c + g * (1.0 - c);
		return [hcg[0], (v - c) * 100, (1 - v) * 100];
	};

	convert.hwb.hcg = function (hwb) {
		var w = hwb[1] / 100;
		var b = hwb[2] / 100;
		var v = 1 - b;
		var c = v - w;
		var g = 0;

		if (c < 1) {
			g = (v - c) / (1 - c);
		}

		return [hwb[0], c * 100, g * 100];
	};

	convert.apple.rgb = function (apple) {
		return [(apple[0] / 65535) * 255, (apple[1] / 65535) * 255, (apple[2] / 65535) * 255];
	};

	convert.rgb.apple = function (rgb) {
		return [(rgb[0] / 255) * 65535, (rgb[1] / 255) * 65535, (rgb[2] / 255) * 65535];
	};

	convert.gray.rgb = function (args) {
		return [args[0] / 100 * 255, args[0] / 100 * 255, args[0] / 100 * 255];
	};

	convert.gray.hsl = convert.gray.hsv = function (args) {
		return [0, 0, args[0]];
	};

	convert.gray.hwb = function (gray) {
		return [0, 100, gray[0]];
	};

	convert.gray.cmyk = function (gray) {
		return [0, 0, 0, gray[0]];
	};

	convert.gray.lab = function (gray) {
		return [gray[0], 0, 0];
	};

	convert.gray.hex = function (gray) {
		var val = Math.round(gray[0] / 100 * 255) & 0xFF;
		var integer = (val << 16) + (val << 8) + val;

		var string = integer.toString(16).toUpperCase();
		return '000000'.substring(string.length) + string;
	};

	convert.rgb.gray = function (rgb) {
		var val = (rgb[0] + rgb[1] + rgb[2]) / 3;
		return [val / 255 * 100];
	};

	/*
		this function routes a model to all other models.

		all functions that are routed have a property `.conversion` attached
		to the returned synthetic function. This property is an array
		of strings, each with the steps in between the 'from' and 'to'
		color models (inclusive).

		conversions that are not possible simply are not included.
	*/

	function buildGraph() {
		var graph = {};
		// https://jsperf.com/object-keys-vs-for-in-with-closure/3
		var models = Object.keys(convert);

		for (var len = models.length, i = 0; i < len; i++) {
			graph[models[i]] = {
				// http://jsperf.com/1-vs-infinity
				// micro-opt, but this is simple.
				distance: -1,
				parent: null
			};
		}

		return graph;
	}

	// https://en.wikipedia.org/wiki/Breadth-first_search
	function deriveBFS(fromModel) {
		var graph = buildGraph();
		var queue = [fromModel]; // unshift -> queue -> pop

		graph[fromModel].distance = 0;

		while (queue.length) {
			var current = queue.pop();
			var adjacents = Object.keys(convert[current]);

			for (var len = adjacents.length, i = 0; i < len; i++) {
				var adjacent = adjacents[i];
				var node = graph[adjacent];

				if (node.distance === -1) {
					node.distance = graph[current].distance + 1;
					node.parent = current;
					queue.unshift(adjacent);
				}
			}
		}

		return graph;
	}

	function link(from, to) {
		return function (args) {
			return to(from(args));
		};
	}

	function wrapConversion(toModel, graph) {
		var path = [graph[toModel].parent, toModel];
		var fn = convert[graph[toModel].parent][toModel];

		var cur = graph[toModel].parent;
		while (graph[cur].parent) {
			path.unshift(graph[cur].parent);
			fn = link(convert[graph[cur].parent][cur], fn);
			cur = graph[cur].parent;
		}

		fn.conversion = path;
		return fn;
	}

	function route (fromModel) {
		var graph = deriveBFS(fromModel);
		var conversion = {};

		var models = Object.keys(graph);
		for (var len = models.length, i = 0; i < len; i++) {
			var toModel = models[i];
			var node = graph[toModel];

			if (node.parent === null) {
				// no possible conversion, or this node is the source model.
				continue;
			}

			conversion[toModel] = wrapConversion(toModel, graph);
		}

		return conversion;
	}

	var convert$1 = {};

	var models = Object.keys(convert);

	function wrapRaw(fn) {
		var wrappedFn = function (args) {
			if (args === undefined || args === null) {
				return args;
			}

			if (arguments.length > 1) {
				args = Array.prototype.slice.call(arguments);
			}

			return fn(args);
		};

		// preserve .conversion property if there is one
		if ('conversion' in fn) {
			wrappedFn.conversion = fn.conversion;
		}

		return wrappedFn;
	}

	function wrapRounded(fn) {
		var wrappedFn = function (args) {
			if (args === undefined || args === null) {
				return args;
			}

			if (arguments.length > 1) {
				args = Array.prototype.slice.call(arguments);
			}

			var result = fn(args);

			// we're assuming the result is an array here.
			// see notice in conversions.js; don't use box types
			// in conversion functions.
			if (typeof result === 'object') {
				for (var len = result.length, i = 0; i < len; i++) {
					result[i] = Math.round(result[i]);
				}
			}

			return result;
		};

		// preserve .conversion property if there is one
		if ('conversion' in fn) {
			wrappedFn.conversion = fn.conversion;
		}

		return wrappedFn;
	}

	models.forEach(function (fromModel) {
		convert$1[fromModel] = {};

		Object.defineProperty(convert$1[fromModel], 'channels', {value: convert[fromModel].channels});
		Object.defineProperty(convert$1[fromModel], 'labels', {value: convert[fromModel].labels});

		var routes = route(fromModel);
		var routeModels = Object.keys(routes);

		routeModels.forEach(function (toModel) {
			var fn = routes[toModel];

			convert$1[fromModel][toModel] = wrapRounded(fn);
			convert$1[fromModel][toModel].raw = wrapRaw(fn);
		});
	});

	var _slice = [].slice;

	var skippedModels = [
		// to be honest, I don't really feel like keyword belongs in color convert, but eh.
		'keyword',

		// gray conflicts with some method names, and has its own method defined.
		'gray',

		// shouldn't really be in color-convert either...
		'hex'
	];

	var hashedModelKeys = {};
	Object.keys(convert$1).forEach(function (model) {
		hashedModelKeys[_slice.call(convert$1[model].labels).sort().join('')] = model;
	});

	var limiters = {};

	function Color(obj, model) {
		if (!(this instanceof Color)) {
			return new Color(obj, model);
		}

		if (model && model in skippedModels) {
			model = null;
		}

		if (model && !(model in convert$1)) {
			throw new Error('Unknown model: ' + model);
		}

		var i;
		var channels;

		if (obj == null) { // eslint-disable-line no-eq-null,eqeqeq
			this.model = 'rgb';
			this.color = [0, 0, 0];
			this.valpha = 1;
		} else if (obj instanceof Color) {
			this.model = obj.model;
			this.color = obj.color.slice();
			this.valpha = obj.valpha;
		} else if (typeof obj === 'string') {
			var result = cs.get(obj);
			if (result === null) {
				throw new Error('Unable to parse color from string: ' + obj);
			}

			this.model = result.model;
			channels = convert$1[this.model].channels;
			this.color = result.value.slice(0, channels);
			this.valpha = typeof result.value[channels] === 'number' ? result.value[channels] : 1;
		} else if (obj.length) {
			this.model = model || 'rgb';
			channels = convert$1[this.model].channels;
			var newArr = _slice.call(obj, 0, channels);
			this.color = zeroArray(newArr, channels);
			this.valpha = typeof obj[channels] === 'number' ? obj[channels] : 1;
		} else if (typeof obj === 'number') {
			// this is always RGB - can be converted later on.
			obj &= 0xFFFFFF;
			this.model = 'rgb';
			this.color = [
				(obj >> 16) & 0xFF,
				(obj >> 8) & 0xFF,
				obj & 0xFF
			];
			this.valpha = 1;
		} else {
			this.valpha = 1;

			var keys = Object.keys(obj);
			if ('alpha' in obj) {
				keys.splice(keys.indexOf('alpha'), 1);
				this.valpha = typeof obj.alpha === 'number' ? obj.alpha : 0;
			}

			var hashedKeys = keys.sort().join('');
			if (!(hashedKeys in hashedModelKeys)) {
				throw new Error('Unable to parse color from object: ' + JSON.stringify(obj));
			}

			this.model = hashedModelKeys[hashedKeys];

			var labels = convert$1[this.model].labels;
			var color = [];
			for (i = 0; i < labels.length; i++) {
				color.push(obj[labels[i]]);
			}

			this.color = zeroArray(color);
		}

		// perform limitations (clamping, etc.)
		if (limiters[this.model]) {
			channels = convert$1[this.model].channels;
			for (i = 0; i < channels; i++) {
				var limit = limiters[this.model][i];
				if (limit) {
					this.color[i] = limit(this.color[i]);
				}
			}
		}

		this.valpha = Math.max(0, Math.min(1, this.valpha));

		if (Object.freeze) {
			Object.freeze(this);
		}
	}

	Color.namedColors = cssKeywords; // Modified from original

	Color.prototype = {
		toString: function () {
			return this.string();
		},

		toJSON: function () {
			return this[this.model]();
		},

		string: function (places) {
			var self = this.model in cs.to ? this : this.rgb();
			self = self.round(typeof places === 'number' ? places : 1);
			var args = self.valpha === 1 ? self.color : self.color.concat(this.valpha);
			return cs.to[self.model](args);
		},

		percentString: function (places) {
			var self = this.rgb().round(typeof places === 'number' ? places : 1);
			var args = self.valpha === 1 ? self.color : self.color.concat(this.valpha);
			return cs.to.rgb.percent(args);
		},

		array: function () {
			return this.valpha === 1 ? this.color.slice() : this.color.concat(this.valpha);
		},

		object: function () {
			var result = {};
			var channels = convert$1[this.model].channels;
			var labels = convert$1[this.model].labels;

			for (var i = 0; i < channels; i++) {
				result[labels[i]] = this.color[i];
			}

			if (this.valpha !== 1) {
				result.alpha = this.valpha;
			}

			return result;
		},

		unitArray: function () {
			var rgb = this.rgb().color;
			rgb[0] /= 255;
			rgb[1] /= 255;
			rgb[2] /= 255;

			if (this.valpha !== 1) {
				rgb.push(this.valpha);
			}

			return rgb;
		},

		unitObject: function () {
			var rgb = this.rgb().object();
			rgb.r /= 255;
			rgb.g /= 255;
			rgb.b /= 255;

			if (this.valpha !== 1) {
				rgb.alpha = this.valpha;
			}

			return rgb;
		},

		round: function (places) {
			places = Math.max(places || 0, 0);
			return new Color(this.color.map(roundToPlace(places)).concat(this.valpha), this.model);
		},

		alpha: function (val) {
			if (arguments.length) {
				return new Color(this.color.concat(Math.max(0, Math.min(1, val))), this.model);
			}

			return this.valpha;
		},

		// rgb
		red: getset('rgb', 0, maxfn(255)),
		green: getset('rgb', 1, maxfn(255)),
		blue: getset('rgb', 2, maxfn(255)),

		hue: getset(['hsl', 'hsv', 'hsl', 'hwb', 'hcg'], 0, function (val) { return ((val % 360) + 360) % 360; }), // eslint-disable-line brace-style

		saturationl: getset('hsl', 1, maxfn(100)),
		lightness: getset('hsl', 2, maxfn(100)),

		saturationv: getset('hsv', 1, maxfn(100)),
		value: getset('hsv', 2, maxfn(100)),

		chroma: getset('hcg', 1, maxfn(100)),
		gray: getset('hcg', 2, maxfn(100)),

		white: getset('hwb', 1, maxfn(100)),
		wblack: getset('hwb', 2, maxfn(100)),

		cyan: getset('cmyk', 0, maxfn(100)),
		magenta: getset('cmyk', 1, maxfn(100)),
		yellow: getset('cmyk', 2, maxfn(100)),
		black: getset('cmyk', 3, maxfn(100)),

		x: getset('xyz', 0, maxfn(100)),
		y: getset('xyz', 1, maxfn(100)),
		z: getset('xyz', 2, maxfn(100)),

		l: getset('lab', 0, maxfn(100)),
		a: getset('lab', 1),
		b: getset('lab', 2),

		keyword: function (val) {
			if (arguments.length) {
				return new Color(val);
			}

			return convert$1[this.model].keyword(this.color);
		},

		hex: function (val) {
			if (arguments.length) {
				return new Color(val);
			}

			return cs.to.hex(this.rgb().round().color);
		},

		rgbNumber: function () {
			var rgb = this.rgb().color;
			return ((rgb[0] & 0xFF) << 16) | ((rgb[1] & 0xFF) << 8) | (rgb[2] & 0xFF);
		},

		luminosity: function () {
			// http://www.w3.org/TR/WCAG20/#relativeluminancedef
			var rgb = this.rgb().color;

			var lum = [];
			for (var i = 0; i < rgb.length; i++) {
				var chan = rgb[i] / 255;
				lum[i] = (chan <= 0.03928) ? chan / 12.92 : Math.pow(((chan + 0.055) / 1.055), 2.4);
			}

			return 0.2126 * lum[0] + 0.7152 * lum[1] + 0.0722 * lum[2];
		},

		contrast: function (color2) {
			// http://www.w3.org/TR/WCAG20/#contrast-ratiodef
			var lum1 = this.luminosity();
			var lum2 = color2.luminosity();

			if (lum1 > lum2) {
				return (lum1 + 0.05) / (lum2 + 0.05);
			}

			return (lum2 + 0.05) / (lum1 + 0.05);
		},

		level: function (color2) {
			var contrastRatio = this.contrast(color2);
			if (contrastRatio >= 7.1) {
				return 'AAA';
			}

			return (contrastRatio >= 4.5) ? 'AA' : '';
		},

		isDark: function () {
			// YIQ equation from http://24ways.org/2010/calculating-color-contrast
			var rgb = this.rgb().color;
			var yiq = (rgb[0] * 299 + rgb[1] * 587 + rgb[2] * 114) / 1000;
			return yiq < 128;
		},

		isLight: function () {
			return !this.isDark();
		},

		negate: function () {
			var rgb = this.rgb();
			for (var i = 0; i < 3; i++) {
				rgb.color[i] = 255 - rgb.color[i];
			}
			return rgb;
		},

		lighten: function (ratio) {
			var hsl = this.hsl();
			hsl.color[2] += hsl.color[2] * ratio;
			return hsl;
		},

		darken: function (ratio) {
			var hsl = this.hsl();
			hsl.color[2] -= hsl.color[2] * ratio;
			return hsl;
		},

		saturate: function (ratio) {
			var hsl = this.hsl();
			hsl.color[1] += hsl.color[1] * ratio;
			return hsl;
		},

		desaturate: function (ratio) {
			var hsl = this.hsl();
			hsl.color[1] -= hsl.color[1] * ratio;
			return hsl;
		},

		whiten: function (ratio) {
			var hwb = this.hwb();
			hwb.color[1] += hwb.color[1] * ratio;
			return hwb;
		},

		blacken: function (ratio) {
			var hwb = this.hwb();
			hwb.color[2] += hwb.color[2] * ratio;
			return hwb;
		},

		grayscale: function () {
			// http://en.wikipedia.org/wiki/Grayscale#Converting_color_to_grayscale
			var rgb = this.rgb().color;
			var val = rgb[0] * 0.3 + rgb[1] * 0.59 + rgb[2] * 0.11;
			return Color.rgb(val, val, val);
		},

		fade: function (ratio) {
			return this.alpha(this.valpha - (this.valpha * ratio));
		},

		opaquer: function (ratio) {
			return this.alpha(this.valpha + (this.valpha * ratio));
		},

		rotate: function (degrees) {
			var hsl = this.hsl();
			var hue = hsl.color[0];
			hue = (hue + degrees) % 360;
			hue = hue < 0 ? 360 + hue : hue;
			hsl.color[0] = hue;
			return hsl;
		},

		mix: function (mixinColor, weight) {
			// ported from sass implementation in C
			// https://github.com/sass/libsass/blob/0e6b4a2850092356aa3ece07c6b249f0221caced/functions.cpp#L209
			if (!mixinColor || !mixinColor.rgb) {
				throw new Error('Argument to "mix" was not a Color instance, but rather an instance of ' + typeof mixinColor);
			}
			var color1 = mixinColor.rgb();
			var color2 = this.rgb();
			var p = weight === undefined ? 0.5 : weight;

			var w = 2 * p - 1;
			var a = color1.alpha() - color2.alpha();

			var w1 = (((w * a === -1) ? w : (w + a) / (1 + w * a)) + 1) / 2.0;
			var w2 = 1 - w1;

			return Color.rgb(
					w1 * color1.red() + w2 * color2.red(),
					w1 * color1.green() + w2 * color2.green(),
					w1 * color1.blue() + w2 * color2.blue(),
					color1.alpha() * p + color2.alpha() * (1 - p));
		}
	};

	// model conversion methods and static constructors
	Object.keys(convert$1).forEach(function (model) {
		if (skippedModels.indexOf(model) !== -1) {
			return;
		}

		var channels = convert$1[model].channels;

		// conversion methods
		Color.prototype[model] = function () {
			if (this.model === model) {
				return new Color(this);
			}

			if (arguments.length) {
				return new Color(arguments, model);
			}

			var newAlpha = typeof arguments[channels] === 'number' ? channels : this.valpha;
			return new Color(assertArray(convert$1[this.model][model].raw(this.color)).concat(newAlpha), model);
		};

		// 'static' construction methods
		Color[model] = function (color) {
			if (typeof color === 'number') {
				color = zeroArray(_slice.call(arguments), channels);
			}
			return new Color(color, model);
		};
	});

	function roundTo(num, places) {
		return Number(num.toFixed(places));
	}

	function roundToPlace(places) {
		return function (num) {
			return roundTo(num, places);
		};
	}

	function getset(model, channel, modifier) {
		model = Array.isArray(model) ? model : [model];

		model.forEach(function (m) {
			(limiters[m] || (limiters[m] = []))[channel] = modifier;
		});

		model = model[0];

		return function (val) {
			var result;

			if (arguments.length) {
				if (modifier) {
					val = modifier(val);
				}

				result = this[model]();
				result.color[channel] = val;
				return result;
			}

			result = this[model]().color[channel];
			if (modifier) {
				result = modifier(result);
			}

			return result;
		};
	}

	function maxfn(max) {
		return function (v) {
			return Math.max(0, Math.min(max, v));
		};
	}

	function assertArray(val) {
		return Array.isArray(val) ? val : [val];
	}

	function zeroArray(arr, length) {
		for (var i = 0; i < length; i++) {
			if (typeof arr[i] !== 'number') {
				arr[i] = 0;
			}
		}

		return arr;
	}

	return Color;

}());