2.6. Measurement of Appearance
The group of measurements necessary to characterize both the color and surface finish of a material is called its measurement of appearance [119]. These measurements involve the spectral and the spatial energy distribution of propagated light. The following definitions closely follow those provided in the seminal book by Hunter and Harold [119] on this topic.
The variations in the spectral distribution of the propagated light affect appearance characteristics such as hue, lightness, and saturation (Figure 2.14). Hue is the attribute of color perception by means of which an object is judged to be red, yellow, green, blue, purple, and so forth (Section 3.4). Lightness is the attribute by which white objects are ...
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