>> You realise there's a difference between a binary-yellow filter and a 
>> unary-yellow filter, right? You haven't specified which one.
>>
> You mean high-pass or band pass?

I mean there are filters that pass the whole band from red to green, and 
there are other filters that only pass the narrow band of yellow 
wavelengths in the middle.

If you pass a beam of light containing a single yellow peak through the 
latter kind of filter, you get yellow. If you pass a bean containing 
seperate red and green peaks through the same filter, you get 
(hypothetically) black.

> BTW welcome back. Skiing again?

No, just staying with relatives for a few days over Christmas. ;-)

-- 
http://blog.orphi.me.uk/
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