On Mon, 2 Aug 1999 Dave Gillett wrote:
>
>On 3 Aug 99, at 2:02, Uzi Paz wrote:
>
> > I guess that in 24bit color graphics:
> > 8 bits are telling me the strength/luminosity of the blue color,
> > 8 bits are telling me the strength/luminosity of the red color,
> > 8 bits are telling me the strength/luminosity of the yellow (or green)
> > color.
> >
> > 1) Am I right?
>
>   Strength, I'd say, as a general "layman's" term.  Luminosity has a very
>specific meaning, like hue and saturation, and whether that is exactly what
>is being specified is less certain.
>
> > 2) Green or Yellow?
>
>   Green.  It's yellow when you're mixing pigments, green when mixing
>lights.
>[No, I can't explain why that is.]

The difference in the color when talking about light and pigments comes from
the fact that pigments operate on the subtractive principle and light
operates on the additive principle.
Mary Jane


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