Chromatic adaptation is the human visual system’s ability to adjust to changes in illumination in order to preserve the appearance of object colors. It is responsible for the stable appearance of object colors despite the wide variation of light which might be reflected from an object and observed by our eyes. A chromatic adaptation transform (CAT) function emulates this important aspect of color perception in color appearance models.
An object may be viewed under various conditions. For example, it may be illuminated by sunlight, the light of a fire, or a harsh electric light. In all of these situations, human vision perceives that the object has the same color: a red apple always appears red, whether viewed during the day or at night (if the red apple is illuminated as rods in our eyes do not see red). On the other hand, a camera with no adjustment for light may register the apple as having varying color. This feature of the visual system is called chromatic adaptation, or color constancy; when the correction occurs in a camera it is referred to as white balance.
Though the human visual system generally does maintain constant perceived color under different lighting, there are situations where the relative brightness of two different stimuli will appear reversed at different illuminance levels. For example, the bright yellow petals of flowers will appear dark compared to the green leaves in dim light while the opposite is true during the day. This is known as the Purkinje effect, and arises because the peak sensitivity of the human eye shifts toward the blue end of the spectrum at lower light levels.
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Chromaticadaptation is the human visual system’s ability to adjust to changes in illumination in order to preserve the appearance of object colors. It...
balance. The algorithms for these processes perform generalized chromaticadaptation. Many methods exist for color balancing. Setting a button on a camera...
successor of CIECAM97s. The two major parts of the model are its chromaticadaptation transform, CIECAT02, and its equations for calculating mathematical...
from. Any chromaticity difference between the source and reference illuminants were to be abridged with a von Kries-type chromaticadaptation transform...
appearance phenomena that color appearance models try to deal with. Chromaticadaptation describes the ability of human color perception to abstract from...
MD (2005). "8. ChromaticAdaptation". Color Appearance Models. Wiley. p. 146. ISBN 978-0-470-01216-1. Süsstrunk S. "ChromaticAdaptation". The Image and...
most widely used law to quantify color adaptation, and is used widely in the field of vision and chromaticadaptation. The von Kries coefficient law compensates...
readily explained and mathematically modeled with modern theories of chromaticadaptation and color appearance (e.g. CIECAM02, iCAM). There is no need to dismiss...
exposed to green light or to red light. This process of "complementary chromaticadaptation" is a way for the cells to maximize the use of available light for...
chromaticadaptation under daylight. Their work in 2008 has revealed that "luminous efficiency or V(l) functions change dramatically with chromatic adaptation"...
adaptation is incomplete. Chromaticadaptation is also regulated by processes within the brain. Research in monkeys suggest that changes in chromatic...
of illumination. Computer display systems use a technique called chromaticadaptation transforms to emulate the correlated color temperature of illumination...
believe they are a result of how the human brain perceives colour and chromaticadaptation. Conway believes it is connected to how the brain processes the various...
by zero. It is common to use the LMS color space when performing chromaticadaptation (estimating the appearance of a sample under a different illuminant)...
The human visual system is able to adapt to these differences by chromaticadaptation. This aspect of the visual system is relatively easy to mislead,...
pointed to the adaptation of cells in the lateral geniculate nucleus designed to correct for chromatic aberration of the eye, to adaptation of cells in the...
those whose light sources appear to be highly chromatic. Color constancy is achieved by chromaticadaptation. The International Commission on Illumination...
that is sometimes preferred uses a Bradford transform or another chromaticadaptation transform; in general, these work by transforming into an intermediate...
spectral locus) when attempting to use it as a chromaticadaptation transform. The translational adaptation transform used in CIELUV has also been shown...
hues of the Planckian locus as a function of the kelvin temperature, rendered with a white point near 6500 K, not accounting for chromaticadaptation...
and sRGB representations of all the various palettes (including chromaticadaptation under default D50 or D65 with 2 degree or 10 degree observer or even...
relative to CIE Illuminant D65 from Illuminant C using the CAT02 chromaticadaptation transform, and relative to a perfect diffuse reflector as white....
below (derived from the inversion of the color space chromaticity coordinates and a chromaticadaptation to CIE Standard Illuminant D50 using the Bradford...
light better. This reversible process is known as complementary chromaticadaptation. It is the component of photosynthetic system of cyanobacteria, as...
color space, CIEUVW. The residual difference in chromaticity is resolved with a chromaticadaptation transform before comparing to the reference illuminant...
a case-by-case basis. CMMs may offer options for BPC and partial chromaticadaptation. A black point correction (BPC) is not applied for absolute colorimetric...
nonuniform, and CQS uses CIELAB as a replacement. The Von Kries chromaticadaptation transform used by Ra does not perform as well as other available...
12th note of a chromatic scale built on C. In Central Europe and Scandinavia, "B" is used to denote B-flat and the 12th note of the chromatic scale is denoted...
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