CIE Chromaticity Diagram was conceptualized by Commission Internationale de I Eclairage in 1931. In this diagram, red, green and blue are replaced by vectors in a 3D space X, Y and Z.
Cλ = XX + YY +ZZ
Where, Cλ = any color.
X, Y, Z = Standard primaries
X, Y, Z = Vectors in a 3D space
x = X/(X + Y +Z), y = Y/(X + Y + Z), Z = Z/ (X + Y + Z)
x + y + z =1,
z = 1 – x – y
X = (x/y) Y
Z = (z/y) Y
Advantages of CIE Chromaticity Diagram:
1) Matching of negative color values are eliminated.
2) Complementary colors and color gamuts are identified by this method. Complementary colors are represented by straight lines and color gamuts are represented by straight lines and a polygon.
3) CIE Chromaticity diagram is used to find the dominant wavelength of a color.