Chromatic Adaption - NEC SpectraView Profiler 5 User Manual

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4.9.2 Chromatic Adaption

Chromatic adaptation is the ability of the human visual system to
discount the color of the illumination and to preserve the appearance of
an object. Chromatic adaptation can be observed by examining a white
object under different types of illumination, such as daylight (blueish)
and incandescent (yellowish). The white object retains its white appear-
ance under both light sources, as soon as the viewer is adapted to the
light source (discounting the illuminant).
Within the ICC color management system, D50 is the reference illumi-
nant. Should a monitor be calibrated to a different white point (e.g. D65),
all colors displayed on this monitor need to be converted so that they
appear like they were being viewed under D50 lighting.
Such transformations are called Chromatic Adaptation Transforms
(CATs). There has been a significant amount of research in determining
CATs that are able to accurately predict color appearance across differ-
ent illuminants. The transforms currently in use are based on minimizing
perceptual error of experimental corresponding color data sets.
none
Is not really no CAT, it rather means: No other than the preferred ICC
chromatic adaptation method.
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