[Gllug] [OT] TFT displays

[Robert Newson]

Martin A. Brooks wrote:

> Peter Childs wrote:
> 
>>     Colour is a difficult subject but monitors give out light hence
>> RGB (Red, Green, Blue) where as printer refract light hence cmyk
>> (Cyan, Magenta, Yellow blacK)
> 
> Mmm, mostly.
> 
> RGB is subtractive, CMYK is additive.  So an RGB display gets orange by 
> having a certain amount of blue removed.

Isn't it the other way round:

RGB is additive: each component R, G, B is added into the mix to produce the 
colour)

CMYK is subtractive: each component subtracts a colour: C absorbs R, 
effectively subtracting it, ie C = -R, M = -G, Y = -B, K = -RGB (to reduce 
the overall amount of light reflected?); so to get orange, you mix certain 
amounts of M & Y? (& K?) etc.

To give an orange, a RGB display gives certain amounts of R and G (more R 
than G(?), but both at less than full intensity(?)).

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