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Thomas Heger wrote:
> 
> Am 03.09.2016 22:18, schrieb The Starmaker:
> 
> >>>>>   1.
> >>>>> Art. a color, as red, yellow, or blue, that in mixture yields other colors.
> >>>>> Compare complementary color (def 1), secondary color, tertiary color.
> >>>>> 2.
> >>>>> Optics. any of a set of monochromatic colors, as red, green, and blue, that are added to match or specify the chromaticity of a stimulus or sample.
> >>>>>
> >>>>> 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).
> 
> ...
> >
> > If you buy a jar of White paint, (Red, Blue and Green mixed) and you add Blue...you get White.
> 
> Definitely not !!!
> 
> If you mix white and blue paint you get light blue.
> 
> TH


You need to understand the defintion of "Primary Color"
There is no mention that the primary colors are subtractive or secondary.

http://www.merriam-webster.com/dictionary/primary%20color
http://www.dictionary.com/browse/primary-color
http://www.businessdictionary.com/definition/primary-colors.html

This is the defintion of "secondary color"
http://dictionary.cambridge.org/dictionary/english/secondary-colour