dev4/psychlops/extention/standard/CIEColor.cs

   1 using System;\r
   2 \r
   3 namespace Psychlops\r
   4 {\r
   5         namespace ColorSpaces\r
   6         {\r
   7                 /*\r
   8                  * CIE 1931\r
   9                  * R: 700 nm\r
  10                  * G: 546.1 nm\r
  11                  * B: 435.8 nm\r
  12                  * White Point: Illuminant E\r
  13                  */\r
  14                 public struct CIERGB\r
  15                 {\r
  16                         public double R, G, B;\r
  17 \r
  18                         public CIEXYZ convertToCIEXYZ()\r
  19                         {\r
  20                                 double[,] b =\r
  21                         { \r
  22                                 { 0.49, 0.31, 0.20 },\r
  23                                 { 0.17697, 0.81240, 0.01063 },\r
  24                                 { 0.00, 0.01, 0.99 }\r
  25                         };\r
  26 \r
  27                                 CIEXYZ v;\r
  28 \r
  29                                 v.X = b[0, 0] * R + b[0, 1] * G + b[0, 2] * B;\r
  30                                 v.Y = b[1, 0] * R + b[1, 1] * G + b[1, 2] * B;\r
  31                                 v.Z = b[2, 0] * R + b[2, 1] * G + b[2, 2] * B;\r
  32 \r
  33                                 return v;\r
  34                         }\r
  35                 }\r
  36 \r
  37                 /*\r
  38                  * CIE 1931\r
  39                  */\r
  40                 public struct CIEXYZ\r
  41                 {\r
  42                         public double X, Y, Z;\r
  43 \r
  44                         public CIExyY convertToCIExyY()\r
  45                         {\r
  46                                 CIExyY v;\r
  47 \r
  48                                 double denominator = X + Y + Z;\r
  49                                 v.x = X / denominator;\r
  50                                 v.y = Y / denominator;\r
  51                                 v.Y = Y;\r
  52 \r
  53                                 return v;\r
  54                         }\r
  55                 }\r
  56 \r
  57                 public struct CIExyY\r
  58                 {\r
  59                         public double x, y, Y;\r
  60 \r
  61                         public CIEXYZ convertToCIEXYZ()\r
  62                         {\r
  63                                 CIEXYZ v;\r
  64 \r
  65                                 v.X = Y / y * x;\r
  66                                 v.Y = Y;\r
  67                                 v.Z = Y / y * (1 - x - y);\r
  68 \r
  69                                 return v;\r
  70                         }\r
  71 \r
  72                         // Yn = 1.0 when RGB of white point is { 1, 1, 1 }\r
  73                         public CIELuv convertToCIELuv(double Yn = 1.0)\r
  74                         {\r
  75 \r
  76                                 CIELuv v;\r
  77 \r
  78                                 double denominator = (-2 * x + 12 * y + 3);\r
  79                                 double up = 4 * x / denominator;\r
  80                                 double vp = 9 * y / denominator;\r
  81 \r
  82                                 double Yd = Y / Yn;\r
  83                                 v.L = Yd > System.Math.Pow(6 / 29, 3) ? 116 * System.Math.Pow(Yd, 3) : System.Math.Pow(29 / 3, 3) * Yd;\r
  84                                 v.u = 13 * v.L * (up - 0.2009);\r
  85                                 v.v = 13 * v.L * (vp - 0.4610);\r
  86 \r
  87                                 return v;\r
  88                         }\r
  89                 }\r
  90 \r
  91                 /* L*u*v*\r
  92                  * CIE 1976\r
  93                  * standard illuminant C\r
  94                  */\r
  95                 public struct CIELuv\r
  96                 {\r
  97                         public double L, u, v;\r
  98 \r
  99                 }\r
 100 \r
 101                 public struct CIELab\r
 102                 {\r
 103                         public double L, a, b;\r
 104 \r
 105                 }\r
 106 \r
 107         }\r
 108 }