The experienced color of a stimulus under specified viewing, adaptation and contextual conditions. Appearance judgments, discrimination thresholds and naming are related but different observations.
A stimulus setting judged to have no chromatic tint under stated conditions. An observer adjusting a patch to cancel a perceived tint moves the physical setting in a compensating direction; the adjustment must not be confused with the direction of the original appearance shift.
Perceived surface achromatic reflectance, often judged relative to a white reference. The same outgoing luminance can support different lightness interpretations under different illumination or scene context.
Perceived amount or intensity of light from a stimulus. It is distinct from physical luminance and from lightness as a judgment related to surface reflectance.
The color attribute distinguishing appearances such as red, yellow, green or blue and their combinations. A hue need not identify a single wavelength, and cone-class labels do not directly specify it.
A hue judged to contain no perceptual mixture of a specified opponent pair, such as a yellow judged neither reddish nor greenish. Its measured setting depends on observer and conditions and should not simply be identified with one retinal cardinal axis.
A yellow judged neither reddish nor greenish. A wavelength or matching setting can operationalize the judgment under controlled conditions; shifts in that setting do not by themselves identify the neural locus of a change.
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