>> There's no such thing as negative colors.
>> How do you expect "minus blue" to look?
> I would have thought yellow.

rgb <0, 0, -1> has no components that would contribute to yellowness. 
Anything that might emit "yellow" light is zero. The closest might be 
that it "emits" negative blue, making things nearby more yellow, sucking 
away the blue via radiosity.

Or maybe it's a quark, where it would be a red/antiblue quark or 
something. ;-)

-- 
   Darren New / San Diego, CA, USA (PST)
     Scruffitarianism - Where T-shirt, jeans,
     and a three-day beard are "Sunday Best."

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