colorspace.js

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	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];
};