On 3/12/2017 12:42 PM, Mike Horvath wrote:
> On Wikipedia it says, "In color spaces which include all, or most
> spectral colors, they form a part of boundary of the set of all real
> colors. If luminance is counted, then spectral colors form a surface,
> otherwise their locus is a curve in a two-dimensional chromaticity space."
>
> Is it acceptable to use the term "locus" to refer to a surface as well
> as a curve? Or is does "locus" only refer to curves?
>

It is to me. ;)
 From this definition: a curve or other figure formed by all the points 
satisfying a particular equation of the relation between coordinates, or 
by a point, line, or surface moving according to mathematically defined 
conditions.

A sphere fits that description. All points equidistant from the centre.

-- 

Regards
     Stephen

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