This may be useful -> en.wikipedia.org/wiki/Primary_… tl;dr version is that there are different primary sets for different occasions. The subtractive set isn't the best for what this guide is teaching, but it works for work such as printing. ^ ^ ouo / i didn't see any replies for this comment so here.
We keep what we're taught in school, I guess. To me, red, green, and blue, will always be the secondary colours (because that's what they are, really). It's fine if you work better with the RGB or RYB colour palette but you should still refer to them as secondary colours and not primary. It doesn't take long to say they are secondary so... I apologise if I sound a bit defensive somehow this always manages to bother me.
So I did some research. Yes, this is 6 months later, but I really feel the need to clear this up.
"Red, green, and blue are the primary colors of light—they can be combined in different proportions to make all other colors. This additive color system is used by light sources, such as televisions and computer monitors."
"However, there is another set of primary colors with which you may be more familiar. The primary colors of pigment (also known as subtractive primaries) are used when producing colors from reflected light; for example, when mixing paint or using a color printer.The primary colors of pigment are magenta, yellow, and cyan (commonly simplified as red, yellow, and blue)."
TVs and computers have different primary colors because light colors are perceived differently than pigment colors. Usually magenta, yellow, and cyan are the terms being used when referring to color printers. For the sake of art, which was this tutorial's purpose, the primary colors are in fact red, yellow, and blue.
Otherwise, are you willing to tell me that all the primary school teachers and art teachers in the world are wrong, and you are right?
My deepest apologies for making such a fuss. Thank you to ConceptCookie for the wonderful tutorials!<3
No, I am telling you that where I live, if you ever told someone the primary colours are red, yellow, and blue you'd be given an pitiful look and be properly instructed on the matter. My art teacher taught me, from the very first day, that primary colours are those which cannot be mixed and he was not wrong. Try painting something with the ACTUAL primary colour wheel in mind and you will end up with a result far more pleasant to the eye. The problem with painting with secondary colours is that, if you're not careful and use a lot of layers (because let us be honest - you cannot apply that colour wheel above in traditional art and expect good results), the painting will probably turn out muddy. That is never good.
It is fine if you want to pain with secondary colours - my god, paint with tertiary colours! - just don't call the primary colours.
And I am telling you that blue and red are not primary colours, regardless of what you use them for. Like I said, I guess people tend to stick with what they are taught. We have been taught differently. (but really, try painting something by mixing magenta, cyan, and yellow - just once - you are going to like the results)