Subversion Repositories Applications.papyrus

/*

	Copyright (c) 2004-2006, The Dojo Foundation

	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the

	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml

*/

dojo.provide("dojo.gfx.Colorspace");

dojo.require("dojo.lang.common");

dojo.require("dojo.math.matrix");

dojo.gfx.Colorspace = function () {

	this.whitePoint = "D65";

	this.stdObserver = "10";

	this.chromaticAdaptationAlg = "bradford";

	this.RGBWorkingSpace = "s_rgb";

	this.useApproxCIELabMapping = 1;

	this.chainMaps = {"RGB_to_xyY":["XYZ"], "xyY_to_RGB":["XYZ"], "RGB_to_Lab":["XYZ"], "Lab_to_RGB":["XYZ"], "RGB_to_LCHab":["XYZ", "Lab"], "LCHab_to_RGB":["Lab"], "xyY_to_Lab":["XYZ"], "Lab_to_xyY":["XYZ"], "XYZ_to_LCHab":["Lab"], "LCHab_to_XYZ":["Lab"], "xyY_to_LCHab":["XYZ", "Lab"], "LCHab_to_xyY":["Lab", "XYZ"], "RGB_to_Luv":["XYZ"], "Luv_to_RGB":["XYZ"], "xyY_to_Luv":["XYZ"], "Luv_to_xyY":["XYZ"], "Lab_to_Luv":["XYZ"], "Luv_to_Lab":["XYZ"], "LCHab_to_Luv":["Lab", "XYZ"], "Luv_to_LCHab":["XYZ", "Lab"], "RGB_to_LCHuv":["XYZ", "Luv"], "LCHuv_to_RGB":["Luv", "XYZ"], "XYZ_to_LCHuv":["Luv"], "LCHuv_to_XYZ":["Luv"], "xyY_to_LCHuv":["XYZ", "Luv"], "LCHuv_to_xyY":["Luv", "XYZ"], "Lab_to_LCHuv":["XYZ", "Luv"], "LCHuv_to_Lab":["Luv", "XYZ"], "LCHab_to_LCHuv":["Lab", "XYZ", "Luv"], "LCHuv_to_LCHab":["Luv", "XYZ", "Lab"], "XYZ_to_CMY":["RGB"], "CMY_to_XYZ":["RGB"], "xyY_to_CMY":["RGB"], "CMY_to_xyY":["RGB"], "Lab_to_CMY":["RGB"], "CMY_to_Lab":["RGB"], "LCHab_to_CMY":["RGB"], "CMY_to_LCHab":["RGB"], "Luv_to_CMY":["RGB"], "CMY_to_Luv":["RGB"], "LCHuv_to_CMY":["RGB"], "CMY_to_LCHuv":["RGB"], "XYZ_to_HSL":["RGB"], "HSL_to_XYZ":["RGB"], "xyY_to_HSL":["RGB"], "HSL_to_xyY":["RGB"], "Lab_to_HSL":["RGB"], "HSL_to_Lab":["RGB"], "LCHab_to_HSL":["RGB"], "HSL_to_LCHab":["RGB"], "Luv_to_HSL":["RGB"], "HSL_to_Luv":["RGB"], "LCHuv_to_HSL":["RGB"], "HSL_to_LCHuv":["RGB"], "CMY_to_HSL":["RGB"], "HSL_to_CMY":["RGB"], "CMYK_to_HSL":["RGB"], "HSL_to_CMYK":["RGB"], "XYZ_to_HSV":["RGB"], "HSV_to_XYZ":["RGB"], "xyY_to_HSV":["RGB"], "HSV_to_xyY":["RGB"], "Lab_to_HSV":["RGB"], "HSV_to_Lab":["RGB"], "LCHab_to_HSV":["RGB"], "HSV_to_LCHab":["RGB"], "Luv_to_HSV":["RGB"], "HSV_to_Luv":["RGB"], "LCHuv_to_HSV":["RGB"], "HSV_to_LCHuv":["RGB"], "CMY_to_HSV":["RGB"], "HSV_to_CMY":["RGB"], "CMYK_to_HSV":["RGB"], "HSV_to_CMYK":["RGB"], "HSL_to_HSV":["RGB"], "HSV_to_HSL":["RGB"], "XYZ_to_CMYK":["RGB"], "CMYK_to_XYZ":["RGB"], "xyY_to_CMYK":["RGB"], "CMYK_to_xyY":["RGB"], "Lab_to_CMYK":["RGB"], "CMYK_to_Lab":["RGB"], "LCHab_to_CMYK":["RGB"], "CMYK_to_LCHab":["RGB"], "Luv_to_CMYK":["RGB"], "CMYK_to_Luv":["RGB"], "LCHuv_to_CMYK":["RGB"], "CMYK_to_LCHuv":["RGB"]};

	return this;

};

dojo.gfx.Colorspace.prototype.convert = function (col, model_from, model_to) {

	var k = model_from + "_to_" + model_to;

	if (this[k]) {

		return this[k](col);

	} else {

		if (this.chainMaps[k]) {

			var cur = model_from;

			var models = this.chainMaps[k].concat();

			models.push(model_to);

			for (var i = 0; i < models.length; i++) {

				col = this.convert(col, cur, models[i]);

				cur = models[i];

			}

			return col;

		} else {

			dojo.debug("Can't convert from " + model_from + " to " + model_to);

		}

	}

};

dojo.gfx.Colorspace.prototype.munge = function (keys, args) {

	if (dojo.lang.isArray(args[0])) {

		args = args[0];

	}

	var out = new Array();

	for (var i = 0; i < keys.length; i++) {

		out[keys.charAt(i)] = args[i];

	}

	return out;

};

dojo.gfx.Colorspace.prototype.getWhitePoint = function () {

	var x = 0;

	var y = 0;

	var t = 0;

	switch (this.stdObserver) {

	  case "2":

		switch (this.whitePoint) {

		  case "E":

			x = 1 / 3;

			y = 1 / 3;

			t = 5400;

			break;

		  case "D50":

			x = 0.34567;

			y = 0.3585;

			t = 5000;

			break;

		  case "D55":

			x = 0.33242;

			y = 0.34743;

			t = 5500;

			break;

		  case "D65":

			x = 0.31271;

			y = 0.32902;

			t = 6500;

			break;

		  case "D75":

			x = 0.29902;

			y = 0.31485;

			t = 7500;

			break;

		  case "A":

			x = 0.44757;

			y = 0.40745;

			t = 2856;

			break;

		  case "B":

			x = 0.34842;

			y = 0.35161;

			t = 4874;

			break;

		  case "C":

			x = 0.31006;

			y = 0.31616;

			t = 6774;

			break;

		  case "9300":

			x = 0.2848;

			y = 0.2932;

			t = 9300;

			break;

		  case "F2":

			x = 0.37207;

			y = 0.37512;

			t = 4200;

			break;

		  case "F7":

			x = 0.31285;

			y = 0.32918;

			t = 6500;

			break;

		  case "F11":

			x = 0.38054;

			y = 0.37691;

			t = 4000;

			break;

		  default:

			dojo.debug("White point " + this.whitePoint + " isn't defined for Std. Observer " + this.strObserver);

		}

		break;

	  case "10":

		switch (this.whitePoint) {

		  case "E":

			x = 1 / 3;

			y = 1 / 3;

			t = 5400;

			break;

		  case "D50":

			x = 0.34773;

			y = 0.35952;

			t = 5000;

			break;

		  case "D55":

			x = 0.33411;

			y = 0.34877;

			t = 5500;

			break;

		  case "D65":

			x = 0.31382;

			y = 0.331;

			t = 6500;

			break;

		  case "D75":

			x = 0.29968;

			y = 0.3174;

			t = 7500;

			break;

		  case "A":

			x = 0.45117;

			y = 0.40594;

			t = 2856;

			break;

		  case "B":

			x = 0.3498;

			y = 0.3527;

			t = 4874;

			break;

		  case "C":

			x = 0.31039;

			y = 0.31905;

			t = 6774;

			break;

		  case "F2":

			x = 0.37928;

			y = 0.36723;

			t = 4200;

			break;

		  case "F7":

			x = 0.31565;

			y = 0.32951;

			t = 6500;

			break;

		  case "F11":

			x = 0.38543;

			y = 0.3711;

			t = 4000;

			break;

		  default:

			dojo.debug("White point " + this.whitePoint + " isn't defined for Std. Observer " + this.strObserver);

		}

		break;

	  default:

		dojo.debug("Std. Observer " + this.strObserver + " isn't defined");

	}

	var z = 1 - x - y;

	var wp = {"x":x, "y":y, "z":z, "t":t};

	wp.Y = 1;

	var XYZ = this.xyY_to_XYZ([wp.x, wp.y, wp.Y]);

	wp.X = XYZ[0];

	wp.Y = XYZ[1];

	wp.Z = XYZ[2];

	return wp;

};

dojo.gfx.Colorspace.prototype.getPrimaries = function () {

	var m = [];

	switch (this.RGBWorkingSpace) {

	  case "adobe_rgb_1998":

		m = [2.2, "D65", 0.64, 0.33, 0.297361, 0.21, 0.71, 0.627355, 0.15, 0.06, 0.075285];

		break;

	  case "apple_rgb":

		m = [1.8, "D65", 0.625, 0.34, 0.244634, 0.28, 0.595, 0.672034, 0.155, 0.07, 0.083332];

		break;

	  case "best_rgb":

		m = [2.2, "D50", 0.7347, 0.2653, 0.228457, 0.215, 0.775, 0.737352, 0.13, 0.035, 0.034191];

		break;

	  case "beta_rgb":

		m = [2.2, "D50", 0.6888, 0.3112, 0.303273, 0.1986, 0.7551, 0.663786, 0.1265, 0.0352, 0.032941];

		break;

	  case "bruce_rgb":

		m = [2.2, "D65", 0.64, 0.33, 0.240995, 0.28, 0.65, 0.683554, 0.15, 0.06, 0.075452];

		break;

	  case "cie_rgb":

		m = [2.2, "E", 0.735, 0.265, 0.176204, 0.274, 0.717, 0.812985, 0.167, 0.009, 0.010811];

		break;

	  case "color_match_rgb":

		m = [1.8, "D50", 0.63, 0.34, 0.274884, 0.295, 0.605, 0.658132, 0.15, 0.075, 0.066985];

		break;

	  case "don_rgb_4":

		m = [2.2, "D50", 0.696, 0.3, 0.27835, 0.215, 0.765, 0.68797, 0.13, 0.035, 0.03368];

		break;

	  case "eci_rgb":

		m = [1.8, "D50", 0.67, 0.33, 0.32025, 0.21, 0.71, 0.602071, 0.14, 0.08, 0.077679];

		break;

	  case "ekta_space_ps5":

		m = [2.2, "D50", 0.695, 0.305, 0.260629, 0.26, 0.7, 0.734946, 0.11, 0.005, 0.004425];

		break;

	  case "ntsc_rgb":

		m = [2.2, "C", 0.67, 0.33, 0.298839, 0.21, 0.71, 0.586811, 0.14, 0.08, 0.11435];

		break;

	  case "pal_secam_rgb":

		m = [2.2, "D65", 0.64, 0.33, 0.222021, 0.29, 0.6, 0.706645, 0.15, 0.06, 0.071334];

		break;

	  case "pro_photo_rgb":

		m = [1.8, "D50", 0.7347, 0.2653, 0.28804, 0.1596, 0.8404, 0.711874, 0.0366, 0.0001, 0.000086];

		break;

	  case "smpte-c_rgb":

		m = [2.2, "D65", 0.63, 0.34, 0.212395, 0.31, 0.595, 0.701049, 0.155, 0.07, 0.086556];

		break;

	  case "s_rgb":

		m = [2.2, "D65", 0.64, 0.33, 0.212656, 0.3, 0.6, 0.715158, 0.15, 0.06, 0.072186];

		break;

	  case "wide_gamut_rgb":

		m = [2.2, "D50", 0.735, 0.265, 0.258187, 0.115, 0.826, 0.724938, 0.157, 0.018, 0.016875];

		break;

	  default:

		dojo.debug("RGB working space " + this.RGBWorkingSpace + " isn't defined");

	}

	var p = {name:this.RGBWorkingSpace, gamma:m[0], wp:m[1], xr:m[2], yr:m[3], Yr:m[4], xg:m[5], yg:m[6], Yg:m[7], xb:m[8], yb:m[9], Yb:m[10]};

	if (p.wp != this.whitePoint) {

		var r = this.XYZ_to_xyY(this.chromaticAdaptation(this.xyY_to_XYZ([p.xr, p.yr, p.Yr]), p.wp, this.whitePoint));

		var g = this.XYZ_to_xyY(this.chromaticAdaptation(this.xyY_to_XYZ([p.xg, p.yg, p.Yg]), p.wp, this.whitePoint));

		var b = this.XYZ_to_xyY(this.chromaticAdaptation(this.xyY_to_XYZ([p.xb, p.yb, p.Yb]), p.wp, this.whitePoint));

		p.xr = r[0];

		p.yr = r[1];

		p.Yr = r[2];

		p.xg = g[0];

		p.yg = g[1];

		p.Yg = g[2];

		p.xb = b[0];

		p.yb = b[1];

		p.Yb = b[2];

		p.wp = this.whitePoint;

	}

	p.zr = 1 - p.xr - p.yr;

	p.zg = 1 - p.xg - p.yg;

	p.zb = 1 - p.xb - p.yb;

	return p;

};

dojo.gfx.Colorspace.prototype.epsilon = function () {

	return this.useApproxCIELabMapping ? 0.008856 : 216 / 24289;

};

dojo.gfx.Colorspace.prototype.kappa = function () {

	return this.useApproxCIELabMapping ? 903.3 : 24389 / 27;

};

dojo.gfx.Colorspace.prototype.XYZ_to_xyY = function () {

	var src = this.munge("XYZ", arguments);

	var sum = src.X + src.Y + src.Z;

	if (sum == 0) {

		var wp = this.getWhitePoint();

		var x = wp.x;

		var y = wp.y;

	} else {

		var x = src.X / sum;

		var y = src.Y / sum;

	}

	var Y = src.Y;

	return [x, y, Y];

};

dojo.gfx.Colorspace.prototype.xyY_to_XYZ = function () {

	var src = this.munge("xyY", arguments);

	if (src.y == 0) {

		var X = 0;

		var Y = 0;

		var Z = 0;

	} else {

		var X = (src.x * src.Y) / src.y;

		var Y = src.Y;

		var Z = ((1 - src.x - src.y) * src.Y) / src.y;

	}

	return [X, Y, Z];

};

dojo.gfx.Colorspace.prototype.RGB_to_XYZ = function () {

	var src = this.munge("RGB", arguments);

	var m = this.getRGB_XYZ_Matrix();

	var pr = this.getPrimaries();

	if (this.RGBWorkingSpace == "s_rgb") {

		var r = (src.R > 0.04045) ? Math.pow(((src.R + 0.055) / 1.055), 2.4) : src.R / 12.92;

		var g = (src.G > 0.04045) ? Math.pow(((src.G + 0.055) / 1.055), 2.4) : src.G / 12.92;

		var b = (src.B > 0.04045) ? Math.pow(((src.B + 0.055) / 1.055), 2.4) : src.B / 12.92;

	} else {

		var r = Math.pow(src.R, pr.gamma);

		var g = Math.pow(src.G, pr.gamma);

		var b = Math.pow(src.B, pr.gamma);

	}

	var XYZ = dojo.math.matrix.multiply([[r, g, b]], m);

	return [XYZ[0][0], XYZ[0][1], XYZ[0][2]];

};

dojo.gfx.Colorspace.prototype.XYZ_to_RGB = function () {

	var src = this.munge("XYZ", arguments);

	var mi = this.getXYZ_RGB_Matrix();

	var pr = this.getPrimaries();

	var rgb = dojo.math.matrix.multiply([[src.X, src.Y, src.Z]], mi);

	var r = rgb[0][0];

	var g = rgb[0][1];

	var b = rgb[0][2];

	if (this.RGBWorkingSpace == "s_rgb") {

		var R = (r > 0.0031308) ? (1.055 * Math.pow(r, 1 / 2.4)) - 0.055 : 12.92 * r;

		var G = (g > 0.0031308) ? (1.055 * Math.pow(g, 1 / 2.4)) - 0.055 : 12.92 * g;

		var B = (b > 0.0031308) ? (1.055 * Math.pow(b, 1 / 2.4)) - 0.055 : 12.92 * b;

	} else {

		var R = Math.pow(r, 1 / pr.gamma);

		var G = Math.pow(g, 1 / pr.gamma);

		var B = Math.pow(b, 1 / pr.gamma);

	}

	return [R, G, B];

};

dojo.gfx.Colorspace.prototype.XYZ_to_Lab = function () {

	var src = this.munge("XYZ", arguments);

	var wp = this.getWhitePoint();

	var xr = src.X / wp.X;

	var yr = src.Y / wp.Y;

	var zr = src.Z / wp.Z;

	var fx = (xr > this.epsilon()) ? Math.pow(xr, 1 / 3) : (this.kappa() * xr + 16) / 116;

	var fy = (yr > this.epsilon()) ? Math.pow(yr, 1 / 3) : (this.kappa() * yr + 16) / 116;

	var fz = (zr > this.epsilon()) ? Math.pow(zr, 1 / 3) : (this.kappa() * zr + 16) / 116;

	var L = 116 * fy - 16;

	var a = 500 * (fx - fy);

	var b = 200 * (fy - fz);

	return [L, a, b];

};

dojo.gfx.Colorspace.prototype.Lab_to_XYZ = function () {

	var src = this.munge("Lab", arguments);

	var wp = this.getWhitePoint();

	var yr = (src.L > (this.kappa() * this.epsilon())) ? Math.pow((src.L + 16) / 116, 3) : src.L / this.kappa();

	var fy = (yr > this.epsilon()) ? (src.L + 16) / 116 : (this.kappa() * yr + 16) / 116;

	var fx = (src.a / 500) + fy;

	var fz = fy - (src.b / 200);

	var fxcube = Math.pow(fx, 3);

	var fzcube = Math.pow(fz, 3);

	var xr = (fxcube > this.epsilon()) ? fxcube : (116 * fx - 16) / this.kappa();

	var zr = (fzcube > this.epsilon()) ? fzcube : (116 * fz - 16) / this.kappa();

	var X = xr * wp.X;

	var Y = yr * wp.Y;

	var Z = zr * wp.Z;

	return [X, Y, Z];

};

dojo.gfx.Colorspace.prototype.Lab_to_LCHab = function () {

	var src = this.munge("Lab", arguments);

	var L = src.L;

	var C = Math.pow(src.a * src.a + src.b * src.b, 0.5);

	var H = Math.atan2(src.b, src.a) * (180 / Math.PI);

	if (H < 0) {

		H += 360;

	}

	if (H > 360) {

		H -= 360;

	}

	return [L, C, H];

};

dojo.gfx.Colorspace.prototype.LCHab_to_Lab = function () {

	var src = this.munge("LCH", arguments);

	var H_rad = src.H * (Math.PI / 180);

	var L = src.L;

	var a = src.C / Math.pow(Math.pow(Math.tan(H_rad), 2) + 1, 0.5);

	if ((90 < src.H) && (src.H < 270)) {

		a = -a;

	}

	var b = Math.pow(Math.pow(src.C, 2) - Math.pow(a, 2), 0.5);

	if (src.H > 180) {

		b = -b;

	}

	return [L, a, b];

};

dojo.gfx.Colorspace.prototype.chromaticAdaptation = function (col, src_w, dst_w) {

	col = this.munge("XYZ", [col]);

	var old_wp = this.whitePoint;

	this.whitePoint = src_w;

	var wp_src = this.getWhitePoint();

	this.whitePoint = dst_w;

	var wp_dst = this.getWhitePoint();

	this.whitePoint = old_wp;

	switch (this.chromaticAdaptationAlg) {

	  case "xyz_scaling":

		var ma = [[1, 0, 0], [0, 1, 0], [0, 0, 1]];

		var mai = [[1, 0, 0], [0, 1, 0], [0, 0, 1]];

		break;

	  case "bradford":

		var ma = [[0.8951, -0.7502, 0.0389], [0.2664, 1.7135, -0.0685], [-0.1614, 0.0367, 1.0296]];

		var mai = [[0.986993, 0.432305, -0.008529], [-0.147054, 0.51836, 0.040043], [0.159963, 0.049291, 0.968487]];

		break;

	  case "von_kries":

		var ma = [[0.40024, -0.2263, 0], [0.7076, 1.16532, 0], [-0.08081, 0.0457, 0.91822]];

		var mai = [[1.859936, 0.361191, 0], [-1.129382, 0.638812, 0], [0.219897, -0.000006, 1.089064]];

		break;

	  default:

		dojo.debug("The " + this.chromaticAdaptationAlg + " chromatic adaptation algorithm matricies are not defined");

	}

	var domain_src = dojo.math.matrix.multiply([[wp_src.x, wp_src.y, wp_src.z]], ma);

	var domain_dst = dojo.math.matrix.multiply([[wp_dst.x, wp_dst.y, wp_dst.z]], ma);

	var centre = [[domain_dst[0][0] / domain_src[0][0], 0, 0], [0, domain_dst[0][1] / domain_src[0][1], 0], [0, 0, domain_dst[0][2] / domain_src[0][2]]];

	var m = dojo.math.matrix.multiply(dojo.math.matrix.multiply(ma, centre), mai);

	var dst = dojo.math.matrix.multiply([[col.X, col.Y, col.Z]], m);

	return dst[0];

};

dojo.gfx.Colorspace.prototype.getRGB_XYZ_Matrix = function () {

	var wp = this.getWhitePoint();

	var pr = this.getPrimaries();

	var Xr = pr.xr / pr.yr;

	var Yr = 1;

	var Zr = (1 - pr.xr - pr.yr) / pr.yr;

	var Xg = pr.xg / pr.yg;

	var Yg = 1;

	var Zg = (1 - pr.xg - pr.yg) / pr.yg;

	var Xb = pr.xb / pr.yb;

	var Yb = 1;

	var Zb = (1 - pr.xb - pr.yb) / pr.yb;

	var m1 = [[Xr, Yr, Zr], [Xg, Yg, Zg], [Xb, Yb, Zb]];

	var m2 = [[wp.X, wp.Y, wp.Z]];

	var sm = dojo.math.matrix.multiply(m2, dojo.math.matrix.inverse(m1));

	var Sr = sm[0][0];

	var Sg = sm[0][1];

	var Sb = sm[0][2];

	var m4 = [[Sr * Xr, Sr * Yr, Sr * Zr], [Sg * Xg, Sg * Yg, Sg * Zg], [Sb * Xb, Sb * Yb, Sb * Zb]];

	return m4;

};

dojo.gfx.Colorspace.prototype.getXYZ_RGB_Matrix = function () {

	var m = this.getRGB_XYZ_Matrix();

	return dojo.math.matrix.inverse(m);

};

dojo.gfx.Colorspace.prototype.XYZ_to_Luv = function () {

	var src = this.munge("XYZ", arguments);

	var wp = this.getWhitePoint();

	var ud = (4 * src.X) / (src.X + 15 * src.Y + 3 * src.Z);

	var vd = (9 * src.Y) / (src.X + 15 * src.Y + 3 * src.Z);

	var udr = (4 * wp.X) / (wp.X + 15 * wp.Y + 3 * wp.Z);

	var vdr = (9 * wp.Y) / (wp.X + 15 * wp.Y + 3 * wp.Z);

	var yr = src.Y / wp.Y;

	var L = (yr > this.epsilon()) ? 116 * Math.pow(yr, 1 / 3) - 16 : this.kappa() * yr;

	var u = 13 * L * (ud - udr);

	var v = 13 * L * (vd - vdr);

	return [L, u, v];

};

dojo.gfx.Colorspace.prototype.Luv_to_XYZ = function () {

	var src = this.munge("Luv", arguments);

	var wp = this.getWhitePoint();

	var uz = (4 * wp.X) / (wp.X + 15 * wp.Y + 3 * wp.Z);

	var vz = (9 * wp.Y) / (wp.X + 15 * wp.Y + 3 * wp.Z);

	var Y = (src.L > this.kappa() * this.epsilon()) ? Math.pow((src.L + 16) / 116, 3) : src.L / this.kappa();

	var a = (1 / 3) * (((52 * src.L) / (src.u + 13 * src.L * uz)) - 1);

	var b = -5 * Y;

	var c = -(1 / 3);

	var d = Y * (((39 * src.L) / (src.v + 13 * src.L * vz)) - 5);

	var X = (d - b) / (a - c);

	var Z = X * a + b;

	return [X, Y, Z];

};

dojo.gfx.Colorspace.prototype.Luv_to_LCHuv = function () {

	var src = this.munge("Luv", arguments);

	var L = src.L;

	var C = Math.pow(src.u * src.u + src.v * src.v, 0.5);

	var H = Math.atan2(src.v, src.u) * (180 / Math.PI);

	if (H < 0) {

		H += 360;

	}

	if (H > 360) {

		H -= 360;

	}

	return [L, C, H];

};

dojo.gfx.Colorspace.prototype.LCHuv_to_Luv = function () {

	var src = this.munge("LCH", arguments);

	var H_rad = src.H * (Math.PI / 180);

	var L = src.L;

	var u = src.C / Math.pow(Math.pow(Math.tan(H_rad), 2) + 1, 0.5);

	var v = Math.pow(src.C * src.C - u * u, 0.5);

	if ((90 < src.H) && (src.H < 270)) {

		u *= -1;

	}

	if (src.H > 180) {

		v *= -1;

	}

	return [L, u, v];

};

dojo.gfx.Colorspace.colorTemp_to_whitePoint = function (T) {

	if (T < 4000) {

		dojo.debug("Can't find a white point for temperatures under 4000K");

		return [0, 0];

	}

	if (T > 25000) {

		dojo.debug("Can't find a white point for temperatures over 25000K");

		return [0, 0];

	}

	var T1 = T;

	var T2 = T * T;

	var T3 = T2 * T;

	var ten9 = Math.pow(10, 9);

	var ten6 = Math.pow(10, 6);

	var ten3 = Math.pow(10, 3);

	if (T <= 7000) {

		var x = (-4.607 * ten9 / T3) + (2.9678 * ten6 / T2) + (0.09911 * ten3 / T) + 0.244063;

	} else {

		var x = (-2.0064 * ten9 / T3) + (1.9018 * ten6 / T2) + (0.24748 * ten3 / T) + 0.23704;

	}

	var y = -3 * x * x + 2.87 * x - 0.275;

	return [x, y];

};

dojo.gfx.Colorspace.prototype.RGB_to_CMY = function () {

	var src = this.munge("RGB", arguments);

	var C = 1 - src.R;

	var M = 1 - src.G;

	var Y = 1 - src.B;

	return [C, M, Y];

};

dojo.gfx.Colorspace.prototype.CMY_to_RGB = function () {

	var src = this.munge("CMY", arguments);

	var R = 1 - src.C;

	var G = 1 - src.M;

	var B = 1 - src.Y;

	return [R, G, B];

};

dojo.gfx.Colorspace.prototype.RGB_to_CMYK = function () {

	var src = this.munge("RGB", arguments);

	var K = Math.min(1 - src.R, 1 - src.G, 1 - src.B);

	var C = (1 - src.R - K) / (1 - K);

	var M = (1 - src.G - K) / (1 - K);

	var Y = (1 - src.B - K) / (1 - K);

	return [C, M, Y, K];

};

dojo.gfx.Colorspace.prototype.CMYK_to_RGB = function () {

	var src = this.munge("CMYK", arguments);

	var R = 1 - Math.min(1, src.C * (1 - src.K) + src.K);

	var G = 1 - Math.min(1, src.M * (1 - src.K) + src.K);

	var B = 1 - Math.min(1, src.Y * (1 - src.K) + src.K);

	return [R, G, B];

};

dojo.gfx.Colorspace.prototype.CMY_to_CMYK = function () {

	var src = this.munge("CMY", arguments);

	var K = Math.min(src.C, src.M, src.Y);

	var C = (src.C - K) / (1 - K);

	var M = (src.M - K) / (1 - K);

	var Y = (src.Y - K) / (1 - K);

	return [C, M, Y, K];

};

dojo.gfx.Colorspace.prototype.CMYK_to_CMY = function () {

	var src = this.munge("CMYK", arguments);

	var C = Math.min(1, src.C * (1 - src.K) + src.K);

	var M = Math.min(1, src.M * (1 - src.K) + src.K);

	var Y = Math.min(1, src.Y * (1 - src.K) + src.K);

	return [C, M, Y];

};

dojo.gfx.Colorspace.prototype.RGB_to_HSV = function () {

	var src = this.munge("RGB", arguments);

	var min = Math.min(src.R, src.G, src.B);

	var V = Math.max(src.R, src.G, src.B);

	var delta = V - min;

	var H = null;

	var S = (V == 0) ? 0 : delta / V;

	if (S == 0) {

		H = 0;

	} else {

		if (src.R == V) {

			H = 60 * (src.G - src.B) / delta;

		} else {

			if (src.G == V) {

				H = 120 + 60 * (src.B - src.R) / delta;

			} else {

				if (src.B == V) {

					H = 240 + 60 * (src.R - src.G) / delta;

				}

			}

		}

		if (H < 0) {

			H += 360;

		}

	}

	H = (H == 0) ? 360 : H;

	return [H, S, V];

};

dojo.gfx.Colorspace.prototype.HSV_to_RGB = function () {

	var src = this.munge("HSV", arguments);

	if (src.H == 360) {

		src.H = 0;

	}

	var r = null;

	var g = null;

	var b = null;

	if (src.S == 0) {

		var R = src.V;

		var G = src.V;

		var B = src.V;

	} else {

		var hTemp = src.H / 60;

		var i = Math.floor(hTemp);

		var f = hTemp - i;

		var p = src.V * (1 - src.S);

		var q = src.V * (1 - (src.S * f));

		var t = src.V * (1 - (src.S * (1 - f)));

		switch (i) {

		  case 0:

			R = src.V;

			G = t;

			B = p;

			break;

		  case 1:

			R = q;

			G = src.V;

			B = p;

			break;

		  case 2:

			R = p;

			G = src.V;

			B = t;

			break;

		  case 3:

			R = p;

			G = q;

			B = src.V;

			break;

		  case 4:

			R = t;

			G = p;

			B = src.V;

			break;

		  case 5:

			R = src.V;

			G = p;

			B = q;

			break;

		}

	}

	return [R, G, B];

};

dojo.gfx.Colorspace.prototype.RGB_to_HSL = function () {

	var src = this.munge("RGB", arguments);

	var min = Math.min(src.R, src.G, src.B);

	var max = Math.max(src.R, src.G, src.B);

	var delta = max - min;

	var H = 0;

	var S = 0;

	var L = (min + max) / 2;

	if ((L > 0) && (L < 1)) {

		S = delta / ((L < 0.5) ? (2 * L) : (2 - 2 * L));

	}

	if (delta > 0) {

		if ((max == src.R) && (max != src.G)) {

			H += (src.G - src.B) / delta;

		}

		if ((max == src.G) && (max != src.B)) {

			H += (2 + (src.B - src.R) / delta);

		}

		if ((max == src.B) && (max != src.R)) {

			H += (4 + (src.R - src.G) / delta);

		}

		H *= 60;

	}

	H = (H == 0) ? 360 : H;

	return [H, S, L];

};

dojo.gfx.Colorspace.prototype.HSL_to_RGB = function () {

	var src = this.munge("HSL", arguments);

	while (src.H < 0) {

		src.H += 360;

	}

	while (src.H >= 360) {

		src.H -= 360;

	}

	var R = 0;

	var G = 0;

	var B = 0;

	if (src.H < 120) {

		R = (120 - src.H) / 60;

		G = src.H / 60;

		B = 0;

	} else {

		if (src.H < 240) {

			R = 0;

			G = (240 - src.H) / 60;

			B = (src.H - 120) / 60;

		} else {

			R = (src.H - 240) / 60;

			G = 0;

			B = (360 - src.H) / 60;

		}

	}

	R = 2 * src.S * Math.min(R, 1) + (1 - src.S);

	G = 2 * src.S * Math.min(G, 1) + (1 - src.S);

	B = 2 * src.S * Math.min(B, 1) + (1 - src.S);

	if (src.L < 0.5) {

		R = src.L * R;

		G = src.L * G;

		B = src.L * B;

	} else {

		R = (1 - src.L) * R + 2 * src.L - 1;

		G = (1 - src.L) * G + 2 * src.L - 1;

		B = (1 - src.L) * B + 2 * src.L - 1;

	}

	return [R, G, B];

};