Günter Wyszecki

Günter Wolfgang Wyszecki (November 08, 1925 – June 22, 1985) was a German-Canadian physicist who made important contributions to the fields of colorimetry and color vision.

[2] In 1953 he was awarded a Fulbright Scholarship and for a year joined Deane B. Judd at the Colorimetry and Photometry section of the U. S. National Bureau of Standards in Washington DC.

In 1955 Wyszecki joined the National Research Council of Canada in Ottawa where he became the leader of its Optics Section in 1960 and Assistant Director of the Division of Physics in 1982, and where he remained until his untimely death from leukemia.

During this period the CIE made many important recommendations in colorimetry, remaining valid today, such as 1 nm tables of the color-matching functions of the two CIE standard observers and the standard illuminants A and D65, addition of integrating-sphere reflectance factor measurement as a recommended measuring geometry, the 1964 (U*V*W*) and the 1976 CIELAB and CIELUV uniform color space and color difference formulas, and others.

[3] With Walter Stiles he also developed mathematical methods to calculate by various methodologies the number of possible metamers for given chromaticities, peaking at the achromatic colors.