Your poll asked Which of these do you think of as primary colours?
And my answer of RYB is indeed what I think of as "primary colours" as that is how they are taught in Fine Arts (http://painting.about.com/od/artglossaryp/g/defprimarycolor.htm) which, according to that link, makes them primary colours because you can't create those colours by mixing other colours together (in paint or similar media). They are the "Primes" of the paint world.
Having done printing design for conventions for twenty years now, and worked in technical documentation (including product pack design), I have more than a passing knowledge of printing terms and design terms so I know about colour separations for printing and the various colour models :-)
And of course these colour models totally ignore some of the other essentials of how something appears visually, such as the matt->gloss range. There is a particular trick in portrait painting where the artist uses nice shiny oils for most of the picture, but paints the pupils of the eyes in matt black, so that the light "falls into" the painting there and because of the lack of shine, the eyes seem to follow you around the room ...
So yes, RYB are primary colours, in a particular arena and for a particular meaning of primary colours.
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Your poll asked
Which of these do you think of as primary colours?
And my answer of RYB is indeed what I think of as "primary colours" as that is how they are taught in Fine Arts (http://painting.about.com/od/artglossaryp/g/defprimarycolor.htm) which, according to that link, makes them primary colours because you can't create those colours by mixing other colours together (in paint or similar media). They are the "Primes" of the paint world.
Having done printing design for conventions for twenty years now, and worked in technical documentation (including product pack design), I have more than a passing knowledge of printing terms and design terms so I know about colour separations for printing and the various colour models :-)
And of course these colour models totally ignore some of the other essentials of how something appears visually, such as the matt->gloss range. There is a particular trick in portrait painting where the artist uses nice shiny oils for most of the picture, but paints the pupils of the eyes in matt black, so that the light "falls into" the painting there and because of the lack of shine, the eyes seem to follow you around the room ...
So yes, RYB are primary colours, in a particular arena and for a particular meaning of primary colours.