May 18, 2018knowledge, opinions/rants, technologyadditive colour mixing, blue, color primaries, green, subtractive color mixing, yellows.westland
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So some people say yellow and blue do green. And also you will uncover other answers that say the yellow and also blue do black. How can this be?

Well, we need to know a small science to get to the bottom the this.

You are watching: Do blue and yellow make green

The figure below shows what happens once you mix suitable yellow colours with an ideal blue pigment. The blue dye shows light perfect in about a third of the spectrum (and absorbs perfectly in the other two thirds). The yellow pigment shows light perfectly in about two thirds the the spectrum (and absorbs perfect in the various other third).

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Notice that through a real yellow colorant, the does not reflect perfect in the middle and long wavelengths and also it does not absorb perfect in the brief wavelengths. The reflects and also absorbs come some extent all the wavelengths but it absorbs an ext the shorter wavelength and absorbs less the middle and also longer wavelengths. The exact same is true of a actual blue pigment; it does no absorb perfectly at the middle and longer wavelengths. The repercussion of this is the you don’t obtain black if friend mix blue and also yellow. Girlfriend would acquire black if the pigments to be ideal yet they room not. Us live in the real world. However, you absolutely don’t obtain a lover bright green as shown in the color wheel through red, yellow and blue primaries. Friend would get a dark desaturated murky dirty greenish colour.

Now let’s view what happens when we mix cyan and also yellow. We’ll start with the appropriate colours.

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That’s right. Mix cyan and also magenta renders blue. The cyan absorbs in one third (the red third) and also the magenta absorbs in one third (the eco-friendly third) however neither absorb the quick wavelengths.

So lastly you have the right to see the the ideal subtractive primaries space cyan, magenta and yellow due to the fact that the cyan is red absorbing, the magenta is green absorbing and the yellow is blue absorbing. And what is more, girlfriend now recognize why this is the instance (rather 보다 accepting dogma). You also understand why over there is a relationship in between the CMY of subtractive mixing and also the RGB the additive mixing.

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John R Reinert Nash says:

This article focuses on pigments, and also why CMY make more logical primaries for pigments. The explanation is hard (as any press printer will certainly tell you!), and the RYB wheel together something taught in elementary college art class really does have to be updated. If we can obtain these males to do a video on CMY, it would certainly go a long way: https://www.youtube.com/watch?v=yu44JRTIxSQ

as a color scientist that straddles the worlds of image catch (RGB!) and print (CMYK and also more!), however, we should absolutely continue to teach the yellow and blue make green, but make it clear the this functions for light, and also not so well for paint. I recall that Kodak did dabble in CMY color filters for a digital camera, however RGB filter (Bayer filter in particular) because that light really perform seem to have won the day for camera record (with some interesting experiments in including an “emerald” fourth pixel shade by Sony that never quite appeared to take it off).