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1/* MIT license */
2var cssKeywords = require('color-name');
3
4// NOTE: conversions should only return primitive values (i.e. arrays, or
5//       values that give correct `typeof` results).
6//       do not use box values types (i.e. Number(), String(), etc.)
7
8var reverseKeywords = {};
9for (var key in cssKeywords) {
10	if (cssKeywords.hasOwnProperty(key)) {
11		reverseKeywords[cssKeywords[key]] = key;
12	}
13}
14
15var convert = module.exports = {
16	rgb: {channels: 3, labels: 'rgb'},
17	hsl: {channels: 3, labels: 'hsl'},
18	hsv: {channels: 3, labels: 'hsv'},
19	hwb: {channels: 3, labels: 'hwb'},
20	cmyk: {channels: 4, labels: 'cmyk'},
21	xyz: {channels: 3, labels: 'xyz'},
22	lab: {channels: 3, labels: 'lab'},
23	lch: {channels: 3, labels: 'lch'},
24	hex: {channels: 1, labels: ['hex']},
25	keyword: {channels: 1, labels: ['keyword']},
26	ansi16: {channels: 1, labels: ['ansi16']},
27	ansi256: {channels: 1, labels: ['ansi256']},
28	hcg: {channels: 3, labels: ['h', 'c', 'g']},
29	apple: {channels: 3, labels: ['r16', 'g16', 'b16']},
30	gray: {channels: 1, labels: ['gray']}
31};
32
33// hide .channels and .labels properties
34for (var model in convert) {
35	if (convert.hasOwnProperty(model)) {
36		if (!('channels' in convert[model])) {
37			throw new Error('missing channels property: ' + model);
38		}
39
40		if (!('labels' in convert[model])) {
41			throw new Error('missing channel labels property: ' + model);
42		}
43
44		if (convert[model].labels.length !== convert[model].channels) {
45			throw new Error('channel and label counts mismatch: ' + model);
46		}
47
48		var channels = convert[model].channels;
49		var labels = convert[model].labels;
50		delete convert[model].channels;
51		delete convert[model].labels;
52		Object.defineProperty(convert[model], 'channels', {value: channels});
53		Object.defineProperty(convert[model], 'labels', {value: labels});
54	}
55}
56
57convert.rgb.hsl = function (rgb) {
58	var r = rgb[0] / 255;
59	var g = rgb[1] / 255;
60	var b = rgb[2] / 255;
61	var min = Math.min(r, g, b);
62	var max = Math.max(r, g, b);
63	var delta = max - min;
64	var h;
65	var s;
66	var l;
67
68	if (max === min) {
69		h = 0;
70	} else if (r === max) {
71		h = (g - b) / delta;
72	} else if (g === max) {
73		h = 2 + (b - r) / delta;
74	} else if (b === max) {
75		h = 4 + (r - g) / delta;
76	}
77
78	h = Math.min(h * 60, 360);
79
80	if (h < 0) {
81		h += 360;
82	}
83
84	l = (min + max) / 2;
85
86	if (max === min) {
87		s = 0;
88	} else if (l <= 0.5) {
89		s = delta / (max + min);
90	} else {
91		s = delta / (2 - max - min);
92	}
93
94	return [h, s * 100, l * 100];
95};
96
97convert.rgb.hsv = function (rgb) {
98	var r = rgb[0];
99	var g = rgb[1];
100	var b = rgb[2];
101	var min = Math.min(r, g, b);
102	var max = Math.max(r, g, b);
103	var delta = max - min;
104	var h;
105	var s;
106	var v;
107
108	if (max === 0) {
109		s = 0;
110	} else {
111		s = (delta / max * 1000) / 10;
112	}
113
114	if (max === min) {
115		h = 0;
116	} else if (r === max) {
117		h = (g - b) / delta;
118	} else if (g === max) {
119		h = 2 + (b - r) / delta;
120	} else if (b === max) {
121		h = 4 + (r - g) / delta;
122	}
123
124	h = Math.min(h * 60, 360);
125
126	if (h < 0) {
127		h += 360;
128	}
129
130	v = ((max / 255) * 1000) / 10;
131
132	return [h, s, v];
133};
134
135convert.rgb.hwb = function (rgb) {
136	var r = rgb[0];
137	var g = rgb[1];
138	var b = rgb[2];
139	var h = convert.rgb.hsl(rgb)[0];
140	var w = 1 / 255 * Math.min(r, Math.min(g, b));
141
142	b = 1 - 1 / 255 * Math.max(r, Math.max(g, b));
143
144	return [h, w * 100, b * 100];
145};
146
147convert.rgb.cmyk = function (rgb) {
148	var r = rgb[0] / 255;
149	var g = rgb[1] / 255;
150	var b = rgb[2] / 255;
151	var c;
152	var m;
153	var y;
154	var k;
155
156	k = Math.min(1 - r, 1 - g, 1 - b);
157	c = (1 - r - k) / (1 - k) || 0;
158	m = (1 - g - k) / (1 - k) || 0;
159	y = (1 - b - k) / (1 - k) || 0;
160
161	return [c * 100, m * 100, y * 100, k * 100];
162};
163
164/**
165 * See https://en.m.wikipedia.org/wiki/Euclidean_distance#Squared_Euclidean_distance
166 * */
167function comparativeDistance(x, y) {
168	return (
169		Math.pow(x[0] - y[0], 2) +
170		Math.pow(x[1] - y[1], 2) +
171		Math.pow(x[2] - y[2], 2)
172	);
173}
174
175convert.rgb.keyword = function (rgb) {
176	var reversed = reverseKeywords[rgb];
177	if (reversed) {
178		return reversed;
179	}
180
181	var currentClosestDistance = Infinity;
182	var currentClosestKeyword;
183
184	for (var keyword in cssKeywords) {
185		if (cssKeywords.hasOwnProperty(keyword)) {
186			var value = cssKeywords[keyword];
187
188			// Compute comparative distance
189			var distance = comparativeDistance(rgb, value);
190
191			// Check if its less, if so set as closest
192			if (distance < currentClosestDistance) {
193				currentClosestDistance = distance;
194				currentClosestKeyword = keyword;
195			}
196		}
197	}
198
199	return currentClosestKeyword;
200};
201
202convert.keyword.rgb = function (keyword) {
203	return cssKeywords[keyword];
204};
205
206convert.rgb.xyz = function (rgb) {
207	var r = rgb[0] / 255;
208	var g = rgb[1] / 255;
209	var b = rgb[2] / 255;
210
211	// assume sRGB
212	r = r > 0.04045 ? Math.pow(((r + 0.055) / 1.055), 2.4) : (r / 12.92);
213	g = g > 0.04045 ? Math.pow(((g + 0.055) / 1.055), 2.4) : (g / 12.92);
214	b = b > 0.04045 ? Math.pow(((b + 0.055) / 1.055), 2.4) : (b / 12.92);
215
216	var x = (r * 0.4124) + (g * 0.3576) + (b * 0.1805);
217	var y = (r * 0.2126) + (g * 0.7152) + (b * 0.0722);
218	var z = (r * 0.0193) + (g * 0.1192) + (b * 0.9505);
219
220	return [x * 100, y * 100, z * 100];
221};
222
223convert.rgb.lab = function (rgb) {
224	var xyz = convert.rgb.xyz(rgb);
225	var x = xyz[0];
226	var y = xyz[1];
227	var z = xyz[2];
228	var l;
229	var a;
230	var b;
231
232	x /= 95.047;
233	y /= 100;
234	z /= 108.883;
235
236	x = x > 0.008856 ? Math.pow(x, 1 / 3) : (7.787 * x) + (16 / 116);
237	y = y > 0.008856 ? Math.pow(y, 1 / 3) : (7.787 * y) + (16 / 116);
238	z = z > 0.008856 ? Math.pow(z, 1 / 3) : (7.787 * z) + (16 / 116);
239
240	l = (116 * y) - 16;
241	a = 500 * (x - y);
242	b = 200 * (y - z);
243
244	return [l, a, b];
245};
246
247convert.hsl.rgb = function (hsl) {
248	var h = hsl[0] / 360;
249	var s = hsl[1] / 100;
250	var l = hsl[2] / 100;
251	var t1;
252	var t2;
253	var t3;
254	var rgb;
255	var val;
256
257	if (s === 0) {
258		val = l * 255;
259		return [val, val, val];
260	}
261
262	if (l < 0.5) {
263		t2 = l * (1 + s);
264	} else {
265		t2 = l + s - l * s;
266	}
267
268	t1 = 2 * l - t2;
269
270	rgb = [0, 0, 0];
271	for (var i = 0; i < 3; i++) {
272		t3 = h + 1 / 3 * -(i - 1);
273		if (t3 < 0) {
274			t3++;
275		}
276		if (t3 > 1) {
277			t3--;
278		}
279
280		if (6 * t3 < 1) {
281			val = t1 + (t2 - t1) * 6 * t3;
282		} else if (2 * t3 < 1) {
283			val = t2;
284		} else if (3 * t3 < 2) {
285			val = t1 + (t2 - t1) * (2 / 3 - t3) * 6;
286		} else {
287			val = t1;
288		}
289
290		rgb[i] = val * 255;
291	}
292
293	return rgb;
294};
295
296convert.hsl.hsv = function (hsl) {
297	var h = hsl[0];
298	var s = hsl[1] / 100;
299	var l = hsl[2] / 100;
300	var smin = s;
301	var lmin = Math.max(l, 0.01);
302	var sv;
303	var v;
304
305	l *= 2;
306	s *= (l <= 1) ? l : 2 - l;
307	smin *= lmin <= 1 ? lmin : 2 - lmin;
308	v = (l + s) / 2;
309	sv = l === 0 ? (2 * smin) / (lmin + smin) : (2 * s) / (l + s);
310
311	return [h, sv * 100, v * 100];
312};
313
314convert.hsv.rgb = function (hsv) {
315	var h = hsv[0] / 60;
316	var s = hsv[1] / 100;
317	var v = hsv[2] / 100;
318	var hi = Math.floor(h) % 6;
319
320	var f = h - Math.floor(h);
321	var p = 255 * v * (1 - s);
322	var q = 255 * v * (1 - (s * f));
323	var t = 255 * v * (1 - (s * (1 - f)));
324	v *= 255;
325
326	switch (hi) {
327		case 0:
328			return [v, t, p];
329		case 1:
330			return [q, v, p];
331		case 2:
332			return [p, v, t];
333		case 3:
334			return [p, q, v];
335		case 4:
336			return [t, p, v];
337		case 5:
338			return [v, p, q];
339	}
340};
341
342convert.hsv.hsl = function (hsv) {
343	var h = hsv[0];
344	var s = hsv[1] / 100;
345	var v = hsv[2] / 100;
346	var vmin = Math.max(v, 0.01);
347	var lmin;
348	var sl;
349	var l;
350
351	l = (2 - s) * v;
352	lmin = (2 - s) * vmin;
353	sl = s * vmin;
354	sl /= (lmin <= 1) ? lmin : 2 - lmin;
355	sl = sl || 0;
356	l /= 2;
357
358	return [h, sl * 100, l * 100];
359};
360
361// http://dev.w3.org/csswg/css-color/#hwb-to-rgb
362convert.hwb.rgb = function (hwb) {
363	var h = hwb[0] / 360;
364	var wh = hwb[1] / 100;
365	var bl = hwb[2] / 100;
366	var ratio = wh + bl;
367	var i;
368	var v;
369	var f;
370	var n;
371
372	// wh + bl cant be > 1
373	if (ratio > 1) {
374		wh /= ratio;
375		bl /= ratio;
376	}
377
378	i = Math.floor(6 * h);
379	v = 1 - bl;
380	f = 6 * h - i;
381
382	if ((i & 0x01) !== 0) {
383		f = 1 - f;
384	}
385
386	n = wh + f * (v - wh); // linear interpolation
387
388	var r;
389	var g;
390	var b;
391	switch (i) {
392		default:
393		case 6:
394		case 0: r = v; g = n; b = wh; break;
395		case 1: r = n; g = v; b = wh; break;
396		case 2: r = wh; g = v; b = n; break;
397		case 3: r = wh; g = n; b = v; break;
398		case 4: r = n; g = wh; b = v; break;
399		case 5: r = v; g = wh; b = n; break;
400	}
401
402	return [r * 255, g * 255, b * 255];
403};
404
405convert.cmyk.rgb = function (cmyk) {
406	var c = cmyk[0] / 100;
407	var m = cmyk[1] / 100;
408	var y = cmyk[2] / 100;
409	var k = cmyk[3] / 100;
410	var r;
411	var g;
412	var b;
413
414	r = 1 - Math.min(1, c * (1 - k) + k);
415	g = 1 - Math.min(1, m * (1 - k) + k);
416	b = 1 - Math.min(1, y * (1 - k) + k);
417
418	return [r * 255, g * 255, b * 255];
419};
420
421convert.xyz.rgb = function (xyz) {
422	var x = xyz[0] / 100;
423	var y = xyz[1] / 100;
424	var z = xyz[2] / 100;
425	var r;
426	var g;
427	var b;
428
429	r = (x * 3.2406) + (y * -1.5372) + (z * -0.4986);
430	g = (x * -0.9689) + (y * 1.8758) + (z * 0.0415);
431	b = (x * 0.0557) + (y * -0.2040) + (z * 1.0570);
432
433	// assume sRGB
434	r = r > 0.0031308
435		? ((1.055 * Math.pow(r, 1.0 / 2.4)) - 0.055)
436		: r * 12.92;
437
438	g = g > 0.0031308
439		? ((1.055 * Math.pow(g, 1.0 / 2.4)) - 0.055)
440		: g * 12.92;
441
442	b = b > 0.0031308
443		? ((1.055 * Math.pow(b, 1.0 / 2.4)) - 0.055)
444		: b * 12.92;
445
446	r = Math.min(Math.max(0, r), 1);
447	g = Math.min(Math.max(0, g), 1);
448	b = Math.min(Math.max(0, b), 1);
449
450	return [r * 255, g * 255, b * 255];
451};
452
453convert.xyz.lab = function (xyz) {
454	var x = xyz[0];
455	var y = xyz[1];
456	var z = xyz[2];
457	var l;
458	var a;
459	var b;
460
461	x /= 95.047;
462	y /= 100;
463	z /= 108.883;
464
465	x = x > 0.008856 ? Math.pow(x, 1 / 3) : (7.787 * x) + (16 / 116);
466	y = y > 0.008856 ? Math.pow(y, 1 / 3) : (7.787 * y) + (16 / 116);
467	z = z > 0.008856 ? Math.pow(z, 1 / 3) : (7.787 * z) + (16 / 116);
468
469	l = (116 * y) - 16;
470	a = 500 * (x - y);
471	b = 200 * (y - z);
472
473	return [l, a, b];
474};
475
476convert.lab.xyz = function (lab) {
477	var l = lab[0];
478	var a = lab[1];
479	var b = lab[2];
480	var x;
481	var y;
482	var z;
483
484	y = (l + 16) / 116;
485	x = a / 500 + y;
486	z = y - b / 200;
487
488	var y2 = Math.pow(y, 3);
489	var x2 = Math.pow(x, 3);
490	var z2 = Math.pow(z, 3);
491	y = y2 > 0.008856 ? y2 : (y - 16 / 116) / 7.787;
492	x = x2 > 0.008856 ? x2 : (x - 16 / 116) / 7.787;
493	z = z2 > 0.008856 ? z2 : (z - 16 / 116) / 7.787;
494
495	x *= 95.047;
496	y *= 100;
497	z *= 108.883;
498
499	return [x, y, z];
500};
501
502convert.lab.lch = function (lab) {
503	var l = lab[0];
504	var a = lab[1];
505	var b = lab[2];
506	var hr;
507	var h;
508	var c;
509
510	hr = Math.atan2(b, a);
511	h = hr * 360 / 2 / Math.PI;
512
513	if (h < 0) {
514		h += 360;
515	}
516
517	c = Math.sqrt(a * a + b * b);
518
519	return [l, c, h];
520};
521
522convert.lch.lab = function (lch) {
523	var l = lch[0];
524	var c = lch[1];
525	var h = lch[2];
526	var a;
527	var b;
528	var hr;
529
530	hr = h / 360 * 2 * Math.PI;
531	a = c * Math.cos(hr);
532	b = c * Math.sin(hr);
533
534	return [l, a, b];
535};
536
537convert.rgb.ansi16 = function (args) {
538	var r = args[0];
539	var g = args[1];
540	var b = args[2];
541	var value = 1 in arguments ? arguments[1] : convert.rgb.hsv(args)[2]; // hsv -> ansi16 optimization
542
543	value = Math.round(value / 50);
544
545	if (value === 0) {
546		return 30;
547	}
548
549	var ansi = 30
550		+ ((Math.round(b / 255) << 2)
551		| (Math.round(g / 255) << 1)
552		| Math.round(r / 255));
553
554	if (value === 2) {
555		ansi += 60;
556	}
557
558	return ansi;
559};
560
561convert.hsv.ansi16 = function (args) {
562	// optimization here; we already know the value and don't need to get
563	// it converted for us.
564	return convert.rgb.ansi16(convert.hsv.rgb(args), args[2]);
565};
566
567convert.rgb.ansi256 = function (args) {
568	var r = args[0];
569	var g = args[1];
570	var b = args[2];
571
572	// we use the extended greyscale palette here, with the exception of
573	// black and white. normal palette only has 4 greyscale shades.
574	if (r === g && g === b) {
575		if (r < 8) {
576			return 16;
577		}
578
579		if (r > 248) {
580			return 231;
581		}
582
583		return Math.round(((r - 8) / 247) * 24) + 232;
584	}
585
586	var ansi = 16
587		+ (36 * Math.round(r / 255 * 5))
588		+ (6 * Math.round(g / 255 * 5))
589		+ Math.round(b / 255 * 5);
590
591	return ansi;
592};
593
594convert.ansi16.rgb = function (args) {
595	var color = args % 10;
596
597	// handle greyscale
598	if (color === 0 || color === 7) {
599		if (args > 50) {
600			color += 3.5;
601		}
602
603		color = color / 10.5 * 255;
604
605		return [color, color, color];
606	}
607
608	var mult = (~~(args > 50) + 1) * 0.5;
609	var r = ((color & 1) * mult) * 255;
610	var g = (((color >> 1) & 1) * mult) * 255;
611	var b = (((color >> 2) & 1) * mult) * 255;
612
613	return [r, g, b];
614};
615
616convert.ansi256.rgb = function (args) {
617	// handle greyscale
618	if (args >= 232) {
619		var c = (args - 232) * 10 + 8;
620		return [c, c, c];
621	}
622
623	args -= 16;
624
625	var rem;
626	var r = Math.floor(args / 36) / 5 * 255;
627	var g = Math.floor((rem = args % 36) / 6) / 5 * 255;
628	var b = (rem % 6) / 5 * 255;
629
630	return [r, g, b];
631};
632
633convert.rgb.hex = function (args) {
634	var integer = ((Math.round(args[0]) & 0xFF) << 16)
635		+ ((Math.round(args[1]) & 0xFF) << 8)
636		+ (Math.round(args[2]) & 0xFF);
637
638	var string = integer.toString(16).toUpperCase();
639	return '000000'.substring(string.length) + string;
640};
641
642convert.hex.rgb = function (args) {
643	var match = args.toString(16).match(/[a-f0-9]{6}|[a-f0-9]{3}/i);
644	if (!match) {
645		return [0, 0, 0];
646	}
647
648	var colorString = match[0];
649
650	if (match[0].length === 3) {
651		colorString = colorString.split('').map(function (char) {
652			return char + char;
653		}).join('');
654	}
655
656	var integer = parseInt(colorString, 16);
657	var r = (integer >> 16) & 0xFF;
658	var g = (integer >> 8) & 0xFF;
659	var b = integer & 0xFF;
660
661	return [r, g, b];
662};
663
664convert.rgb.hcg = function (rgb) {
665	var r = rgb[0] / 255;
666	var g = rgb[1] / 255;
667	var b = rgb[2] / 255;
668	var max = Math.max(Math.max(r, g), b);
669	var min = Math.min(Math.min(r, g), b);
670	var chroma = (max - min);
671	var grayscale;
672	var hue;
673
674	if (chroma < 1) {
675		grayscale = min / (1 - chroma);
676	} else {
677		grayscale = 0;
678	}
679
680	if (chroma <= 0) {
681		hue = 0;
682	} else
683	if (max === r) {
684		hue = ((g - b) / chroma) % 6;
685	} else
686	if (max === g) {
687		hue = 2 + (b - r) / chroma;
688	} else {
689		hue = 4 + (r - g) / chroma + 4;
690	}
691
692	hue /= 6;
693	hue %= 1;
694
695	return [hue * 360, chroma * 100, grayscale * 100];
696};
697
698convert.hsl.hcg = function (hsl) {
699	var s = hsl[1] / 100;
700	var l = hsl[2] / 100;
701	var c = 1;
702	var f = 0;
703
704	if (l < 0.5) {
705		c = 2.0 * s * l;
706	} else {
707		c = 2.0 * s * (1.0 - l);
708	}
709
710	if (c < 1.0) {
711		f = (l - 0.5 * c) / (1.0 - c);
712	}
713
714	return [hsl[0], c * 100, f * 100];
715};
716
717convert.hsv.hcg = function (hsv) {
718	var s = hsv[1] / 100;
719	var v = hsv[2] / 100;
720
721	var c = s * v;
722	var f = 0;
723
724	if (c < 1.0) {
725		f = (v - c) / (1 - c);
726	}
727
728	return [hsv[0], c * 100, f * 100];
729};
730
731convert.hcg.rgb = function (hcg) {
732	var h = hcg[0] / 360;
733	var c = hcg[1] / 100;
734	var g = hcg[2] / 100;
735
736	if (c === 0.0) {
737		return [g * 255, g * 255, g * 255];
738	}
739
740	var pure = [0, 0, 0];
741	var hi = (h % 1) * 6;
742	var v = hi % 1;
743	var w = 1 - v;
744	var mg = 0;
745
746	switch (Math.floor(hi)) {
747		case 0:
748			pure[0] = 1; pure[1] = v; pure[2] = 0; break;
749		case 1:
750			pure[0] = w; pure[1] = 1; pure[2] = 0; break;
751		case 2:
752			pure[0] = 0; pure[1] = 1; pure[2] = v; break;
753		case 3:
754			pure[0] = 0; pure[1] = w; pure[2] = 1; break;
755		case 4:
756			pure[0] = v; pure[1] = 0; pure[2] = 1; break;
757		default:
758			pure[0] = 1; pure[1] = 0; pure[2] = w;
759	}
760
761	mg = (1.0 - c) * g;
762
763	return [
764		(c * pure[0] + mg) * 255,
765		(c * pure[1] + mg) * 255,
766		(c * pure[2] + mg) * 255
767	];
768};
769
770convert.hcg.hsv = function (hcg) {
771	var c = hcg[1] / 100;
772	var g = hcg[2] / 100;
773
774	var v = c + g * (1.0 - c);
775	var f = 0;
776
777	if (v > 0.0) {
778		f = c / v;
779	}
780
781	return [hcg[0], f * 100, v * 100];
782};
783
784convert.hcg.hsl = function (hcg) {
785	var c = hcg[1] / 100;
786	var g = hcg[2] / 100;
787
788	var l = g * (1.0 - c) + 0.5 * c;
789	var s = 0;
790
791	if (l > 0.0 && l < 0.5) {
792		s = c / (2 * l);
793	} else
794	if (l >= 0.5 && l < 1.0) {
795		s = c / (2 * (1 - l));
796	}
797
798	return [hcg[0], s * 100, l * 100];
799};
800
801convert.hcg.hwb = function (hcg) {
802	var c = hcg[1] / 100;
803	var g = hcg[2] / 100;
804	var v = c + g * (1.0 - c);
805	return [hcg[0], (v - c) * 100, (1 - v) * 100];
806};
807
808convert.hwb.hcg = function (hwb) {
809	var w = hwb[1] / 100;
810	var b = hwb[2] / 100;
811	var v = 1 - b;
812	var c = v - w;
813	var g = 0;
814
815	if (c < 1) {
816		g = (v - c) / (1 - c);
817	}
818
819	return [hwb[0], c * 100, g * 100];
820};
821
822convert.apple.rgb = function (apple) {
823	return [(apple[0] / 65535) * 255, (apple[1] / 65535) * 255, (apple[2] / 65535) * 255];
824};
825
826convert.rgb.apple = function (rgb) {
827	return [(rgb[0] / 255) * 65535, (rgb[1] / 255) * 65535, (rgb[2] / 255) * 65535];
828};
829
830convert.gray.rgb = function (args) {
831	return [args[0] / 100 * 255, args[0] / 100 * 255, args[0] / 100 * 255];
832};
833
834convert.gray.hsl = convert.gray.hsv = function (args) {
835	return [0, 0, args[0]];
836};
837
838convert.gray.hwb = function (gray) {
839	return [0, 100, gray[0]];
840};
841
842convert.gray.cmyk = function (gray) {
843	return [0, 0, 0, gray[0]];
844};
845
846convert.gray.lab = function (gray) {
847	return [gray[0], 0, 0];
848};
849
850convert.gray.hex = function (gray) {
851	var val = Math.round(gray[0] / 100 * 255) & 0xFF;
852	var integer = (val << 16) + (val << 8) + val;
853
854	var string = integer.toString(16).toUpperCase();
855	return '000000'.substring(string.length) + string;
856};
857
858convert.rgb.gray = function (rgb) {
859	var val = (rgb[0] + rgb[1] + rgb[2]) / 3;
860	return [val / 255 * 100];
861};
862