New file |
0,0 → 1,721 |
/* |
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]; |
}; |
|