The Abney effect: chromaticity coordinates of unique and other constant hues
We compared unique and other constant hue loci measured at a fixed retinal illuminance for
the same observers. When expressed in Judd chromaticity coordinates, unique hue and
constant hue data agreed. Unique blue loci were curved, and unique red and green loci
were noncollinear. These data imply that unique hues are not a linear transformation of color
matching functions. Linear models are only an approximation, even at a single luminance
level.
the same observers. When expressed in Judd chromaticity coordinates, unique hue and
constant hue data agreed. Unique blue loci were curved, and unique red and green loci
were noncollinear. These data imply that unique hues are not a linear transformation of color
matching functions. Linear models are only an approximation, even at a single luminance
level.
Abstract
We compared unique and other constant hue loci measured at a fixed retinal illuminance for the same observers. When expressed in Judd chromaticity coordinates, unique hue and constant hue data agreed. Unique blue loci were curved, and unique red and green loci were noncollinear. These data imply that unique hues are not a linear transformation of color matching functions. Linear models are only an approximation, even at a single luminance level.
Elsevier
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