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From: The Starmaker <starmaker@ix.netcom.com>
Newsgroups: sci.physics.relativity
Subject: Re: Red, Blue and Green
Date: Tue, 06 Sep 2016 16:49:45 -0700
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Xref: csiph.com sci.physics.relativity:391666

Thomas Heger wrote:
> 
> Am 06.09.2016 07:49, schrieb The Starmaker:
> 
> >>>>>>> There above are Two primary colors
> >>>>>>>
> >>>>>>> 1.red, yellow, and blue
> >>>>>>>
> >>>>>>> 2.red, green, and blue
> >>>>>>>
> >> ...
> >>>>>>> My question is...why are there two "primary" colors on earth?
> >>
> >> Answer:
> >> 1.) subtractive mixture of colours above a white surface
> >> 2.) additive mixture of light of different colour on a black background
> >>
> >> You can easily see the difference on your computer screen, if you use a
> >> strong magnifying lens.
> >>
> >> Then you would see tiny dots in red, blue and green, which together
> >> create the impression of white.
> >>
> >> If you subtract the colours, you use the opposite colours called yellow,
> >> magenta and cyan, (which is roughly yellow red and blue).
> >
> >
> > So, if you mix (yellow and blue) what color do you get, a subtractive color, a secondary color, or a primary color?
> 
> You use the term 'colour' in different meanings. This is not helpful, if
> you want someone would understand what you write.


The operative word is "primary", not color. PRIMARY!

http://www.dictionary.com/browse/primary

Not secondary, not subtractive...Primary!


http://www.dictionary.com/browse/primary-color

 
1.
Art. a color, as red, yellow, or blue, that in mixture yields other
colors. 



2.
Optics. any of a set of monochromatic colors, as red, green, and blue,
...




Don't you see that there are TWO sets of primary colors? Or are you
color blind???