Lightness and Brightness and Other Confusions

any hue is one of constant value. In addition, the Munsell chroma scale has
no maximum limit, only a definition of equal steps.
In Principles of Color Technology by Billmayer and Saltzman there is the
following definition of chroma:
Perceived chroma (of a non-luminous related color). Attribute of a visual
sensation according to which a non-luminous related color appears to
exhibit more or less chromatic color, judged in proportion to the brightness
of a white object color similarly illuminated. (Billmayer & Saltzman
1981).
Billmayer and Saltzman point out that the term perceived chroma is used to
distinguish it from Munsell chroma as well as the other uses of the word
chroma. But what other uses are there? One instance is the L*C*h* colour
space, where a colour may be expressed in terms of hue angle (h*) and
chroma (C*). The third attribute here is Lightness (L*). Here the definition of
chroma is very similar to Munsell’s, except that L*C*h* does have limits for
the maximum’s of all three attributes.
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