File: xyYToXYZ.m

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psychtoolbox-3 3.0.14.20170103%2Bgit6-g605ff5c.dfsg1-1
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function XYZ = xyYToXYZ(xyY)
% XYZ = xyYToXYZ(xyY)
%
% Compute tristimulus coordinates from
% chromaticity and luminance.
%
% 8/24/09  dhb  Look at it.

[m,n] = size(xyY);
XYZ = zeros(m,n);
for i = 1:n
  z = 1 - xyY(1,i) - xyY(2,i);
  XYZ(1,i) = xyY(3,i)*xyY(1,i)/xyY(2,i);
  XYZ(2,i) = xyY(3,i);
  XYZ(3,i) = xyY(3,i)*z/xyY(2,i);
end