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...omputed within`grDevics:::chromaticAdaptation` for the "D65"->"D50" conversion (approximately) matches the corresponding matrix from brucelindbloom.com chromatic adaptation page: http://www.brucelindbloom.com/Eqn_ChromAdapt.html Additionally visual inspection via ??? scales::show_col(c(rgb.in, rgb(clr.out))) is consistent with a shift from bluer indirect daylight ("D65") to yellower direct daylight ("D50") illuminant. It is worth noting that the adaption method currently in`grDevices:::chromaticAdaptation` appears to be the "Von Kries" method, not...