SOME CLASSICAL COLOR DIFFERENCES CALCULATED WITH NEW FORMULAS

An evaluation of chromatic and color-threshold differences was carried out by using the CMC(l:c) and the BFD(l:c) color-difference formulas [J. Soc. Dyers Colour. 100, 128 (1984); 103, 86 (1987)] from experimental threshold results obtained with visual colorimeters [J. Opt. Soc. Am. 32, 247 (1942); 39, 808 (1949); 47, 137 (1957); 61, 1135 (1971)]. The good results previously reported on the use of these two new formulas with surface colors are also found for the chromatic differences calculated,especially with the BFD(1:1) formula. In the case of color differences BFD(0.6:1) improves the results achieved with BFD(1:1) and gives results similar to those of CMC(1:1). The claim of CMC(l:c)and BFD(l:c) as sometimes superior alternatives to the currently recommended CIE formulas CIELUV and CIELAB can be supported by the present results.