Convert data from CIE xyY to CIE XYZ values
xyz = xyy2xyz(xyy)
Purpose:
It is common to represent the color of a light using xyY (chromaticity
coordinates and luminance). This routine converts from the xyY
representation to the standard XYZ representation.
The values are all represented in n X 3 format. For XYZ, the first
column is X, second column is Y and third is Z. Similarly, the
input columns must be x,y, and Y.
Formula:
X = (x/y)*Y,
Z = ((1 - x - y)/y) * Y
Also, note that Y/y = X+Y+Z
Copyright ImagEval Consultants, LLC, 2003.