0 (a degree of lightness, darkness, strength, etc. of) a colour: --
2 a color, or the particular degree of light or dark of a color: --
For example, you might focus on its hue, or its brightness.
Note that these meanings restrict themselves to hue.
Using hue scaling to specify color appearance and to derive color differences.
For adult subjects, isolated spots of light are classically described as varying along three perceptual dimensions: hue, brightness, and saturation.
An alternative possibility is that hue and contrast might be carried by different subsets of channels with different proper ties.
A thrice-recurring ritornello appears in varied hues on each occasion.
The order of unique hues was only partially counterbalanced, because not all possible orders could be used given 4 days of collection.
Errors in hue placement are reduced by chance and by careful observation.