xy = uvToxy(uv,[compute1960])

Convert CIE u’v’ chromaticity to CIE xy chromaticity.

These are u’,v’ chromaticity coordinates in notation
used by CIE. See CIE Colorimetry 2004 publication, or Wyszecki
and Stiles, 2cd, page 165.

Note that there is an obsolete u,v chromaticity diagram that is similar
but uses 6 in the numerator for u rather than the 9 that is used for u’.
See CIE Coloimetry 2004, Appendix A, or Judd and Wyszecki, p. 296. If
you want this (maybe to compute correlated color temperatures), you can
pass this as 1. It is 0 by default.

See also uvYToXYZ, XYZTouvY, xyTouv

7/15/03 dhb, bx Wrote it.
3/17/04 dhb Fixed typos. This must not have been tested previously.
5/06/11 dhb Improve comment, optional 1960 computations

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