On Mon, 23 Dec 2002 13:20:12 -0500, Alan Browne wrote:

>Light meters (generally) are calibrated at a mystical reference called
>18% grey, representing the "average scene". What comes as a surprise is
>that this average scene does occur from time to time. The meters expose
>for a light level, not for color. (Color metering requires a known
>temperature light source in any case).
[...]

But the light level is measured with color (even
an 18% grey card is "colored", but with an even
balance/mix of the ingredient colors...), and
the color response of the meter becomes more
important as the subject color becomes higher
in purity (narrower in bandwidth).