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ImfChromaticities.h
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34 
35 
36 #ifndef INCLUDED_IMF_CHROMATICITIES_H
37 #define INCLUDED_IMF_CHROMATICITIES_H
38 
39 //-----------------------------------------------------------------------------
40 //
41 // CIE (x,y) chromaticities, and conversions between
42 // RGB tiples and CIE XYZ tristimulus values.
43 //
44 //-----------------------------------------------------------------------------
45 
46 #include "ImathVec.h"
47 #include "ImathMatrix.h"
48 #include "ImfNamespace.h"
49 #include "ImfExport.h"
50 
51 
53 
54 
56 {
57  //-----------------------------------------------
58  // The CIE x and y coordinates of the RGB triples
59  // (1,0,0), (0,1,0), (0,0,1) and (1,1,1).
60  //-----------------------------------------------
61 
66 
67  //--------------------------------------------
68  // Default constructor produces chromaticities
69  // according to Rec. ITU-R BT.709-3
70  //--------------------------------------------
71 
73  const IMATH_NAMESPACE::V2f &green = IMATH_NAMESPACE::V2f (0.3000f, 0.6000f),
74  const IMATH_NAMESPACE::V2f &blue = IMATH_NAMESPACE::V2f (0.1500f, 0.0600f),
75  const IMATH_NAMESPACE::V2f &white = IMATH_NAMESPACE::V2f (0.3127f, 0.3290f));
76 
77 
78  //---------
79  // Equality
80  //---------
81 
82  bool operator == (const Chromaticities &v) const;
83  bool operator != (const Chromaticities &v) const;
84 };
85 
86 
87 //
88 // Conversions between RGB and CIE XYZ
89 //
90 // RGB to XYZ:
91 //
92 // Given a set of chromaticities, c, and the luminance, Y, of the RGB
93 // triple (1,1,1), or "white", RGBtoXYZ(c,Y) computes a matrix, M, so
94 // that multiplying an RGB value, v, with M produces an equivalent
95 // XYZ value, w. (w == v * M)
96 //
97 // If we define that
98 //
99 // (Xr, Yr, Zr) == (1, 0, 0) * M
100 // (Xg, Yg, Zg) == (0, 1, 0) * M
101 // (Xb, Yb, Zb) == (0, 0, 1) * M
102 // (Xw, Yw, Zw) == (1, 1, 1) * M,
103 //
104 // then the following statements are true:
105 //
106 // Xr / (Xr + Yr + Zr) == c.red.x
107 // Yr / (Xr + Yr + Zr) == c.red.y
108 //
109 // Xg / (Xg + Yg + Zg) == c.red.x
110 // Yg / (Xg + Yg + Zg) == c.red.y
111 //
112 // Xb / (Xb + Yb + Zb) == c.red.x
113 // Yb / (Xb + Yb + Zb) == c.red.y
114 //
115 // Xw / (Xw + Yw + Zw) == c.red.x
116 // Yw / (Xw + Yw + Zw) == c.red.y
117 //
118 // Yw == Y.
119 //
120 // XYZ to RGB:
121 //
122 // YYZtoRGB(c,Y) returns RGBtoXYZ(c,Y).inverse().
123 //
124 
127 
128 
130 
131 #endif
Matrix44< float > M44f
Definition: ImathMatrix.h:873
#define OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT
Definition: ImfNamespace.h:109
const GLdouble * v
Definition: glcorearb.h:836
IMATH_NAMESPACE::V2f red
IMATH_NAMESPACE::V2f blue
bool operator==(const BaseDimensions< T > &a, const BaseDimensions< Y > &b)
Definition: Dimensions.h:137
GLfloat f
Definition: glcorearb.h:1925
IMF_EXPORT IMATH_NAMESPACE::M44f RGBtoXYZ(const Chromaticities chroma, float Y)
#define IMF_EXPORT
Definition: ImfExport.h:59
IMATH_NAMESPACE::V2f green
Vec2< float > V2f
Definition: ImathVec.h:689
GLfloat green
Definition: glcorearb.h:111
#define OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER
Definition: ImfNamespace.h:108
bool operator!=(const BaseDimensions< T > &a, const BaseDimensions< Y > &b)
Definition: Dimensions.h:165
GLfloat GLfloat blue
Definition: glcorearb.h:111
int double red
Definition: png.h:1705
IMF_EXPORT IMATH_NAMESPACE::M44f XYZtoRGB(const Chromaticities chroma, float Y)
IMATH_NAMESPACE::V2f white