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It is one of the most fundamental properties of how we perceive the world. And in art, science and technology, colors help our emotions, convey information and influence design decisions. At the heart of all colour science are the primary colours, the fundamental colours that we can mix together to make up most other colours that we see.

But what are primary colors, anyway? And what’s the difference between cyan, magenta and yellow vs. the blue, yellow and red we understood as children? And how does knowledge of color mixing help us in the real world, from printing to digital displays? Let’s take a closer look.

The Basic Definition and Core Status of Primary Colors

While the term primary colors are in common use, it’s actually a bit of a misnomer and the easiest way to think about primary colors is this: These are the basic colors that cannot be created through mixing other colors together but they can be mixed together to produce secondary and tertiary colors. “Their existence simply means that the visible spectrum is not just a continuous scale but it is made from ‘building blocks,’” he wrote in an email.

Many people have been taught conventional art primary colours as the set of blue, yellow, and red colour. For simple painting imagery this may be good enough, but it is inadequate to explain how light and pigments actually interact. Contemporary color theory distinguishes two sets of three primary colors:

● Additive primaries: red, green, blue (RGB) – used in light and computer screens.

● Subtractive primaries: Cyan, magenta, yellow (CMY) — pigments, printing and paints.

These two systems have different functions, depending on whether we are dealing with emitted light or reflected light. Their classification reveals how profound the science of color actually is.

The Classification and Application Differences of Three Primary Colors

Speaking of three primary colors, why do some people say red, yellow and blue and others’ swears by magenta cyan yellow? The answer lies in application.

● Printing and Pigmentary-based media use the subtractive color model. The primary subtractive colors are cyan, magenta and yellow; the secondary subtractive colors are red, green and blue. When mixed up in equal proportions, they are supposed to suck in all the light, and leave black. That’s why printers go one step further and include black (K), resulting in the CMYK cyan magenta yellow black system.

● In light based systems such as computer monitors, projectors and televisions, the model is an additive one. Red, green, and blue are the primaries here. The intersections produce the secondary colors — cyan, magenta and yellow — and when all three of these secondary colors overlap they create white.

The issue of additive color versus subtractive color is critical – one involves mixing light, the other pigments.

The scientific analysis of colour characteristics

Color goes beyond the name of a color; it includes measurable properties. In the science of color, there are three features to study:

● Hue – the color itself (red, green, blue etc).

● Saturation – brightness or purity of the color.

● Value (or the hue) – how light or dark the color is.

In a color mix, this characteristics move around when the subtractive or additive model is employed. This is why cyan + magenta make a strong blue in printing but don’t if you mix those same hues of light.

The Visual Principles of Color Contrast and Harmony

Color doesn’t just depend on science; it depends on perception. As human beings, we automatically react to contrast and harmony. So-called complementary colors— red and cyan, green and magenta, yellow and blue — have strong contrast when placed next to each other. This is exactly why text on the opposite color seems sharper.

Instead, harmony arises from analogous colors (those beside each other on the color wheel). Designers and artists find a compromise between contrasts and harmony in order to design visuals that are pretty, but still work.

Color Addition and Subtraction Properties

Additive Color Mixing

Color mixing on the additive color wheel occurs by adding light. So, the three colors of light are red, green and blue. At varying intensities, mixing them creates every other color on a screen. For example:

● Red + Green = Yellow

● Red + Blue = Magenta

● Green + Blue = Cyan

● Red + Green + Blue = White

This is the principle behind everything from smartphone displays to big stadium screens.

Subtractive Color Process

With the subtractive color model, it is absorption of light rather than emission which occurs. This is why mixing paints is a different experience than mixing digital colors. The way the subtraction is made is as follows:

● Cyan + Magenta = Blue

● Magenta + Yellow = Red

● Yellow + Cyan = Green

Cyan + Magenta + Yellow = "Should be black" (but in practice is a pretty ugly dark brown, which is why printers also use black ink).

And that prompts a popular question: how to make black?

How to Make the Black Colour

Black is the absence of light, but in pigment it is made by mixing all the colors that soak up most lights. In theory:

● What two colors make black? Cyan and red, or green and magenta in a mixture can get close to black.

● What is the method of making black colour in painting? You can mix all three primaries—cyan, magenta, and yellow—which according to many artists tends to produce a dull, muddying color.

● In printing, the answer is the CMYK mixer, which includes its own black ink for depth and clarity.

This is the reason why when we look up how to make color black with paint, guides would always tell you that it will vary whether there are primaries involved or if you’re dealing with complements. For instance, purple and green produce a darker; nearly neutral hue. So, what does purple and green make? They are usually brown or near-black, depending on the pigments.

However, with light it is not possible to "make" black because light is additive. Black is not a color, it has no projected light.

Practical Applications in Science and Design

Knowing your primary colors comes in handy not just as a concept. It has direct applications in:

● Printing: Subtractive and CMYK process accurately reproduces images.

● Digital displays: The additive RGB system enables the full range of colors to be achieved on a screen.

● Art and design: Understanding of color wheel and color combinations enables artists to create depth, balance, and harmony.

● Teaching: Teaching students the distinction between primary colors of light and pigment helps to clear up confusion in their understanding of "red-yellow-blue" vs. "magenta-cyan-yellow."

And it can be used to answer much simpler questions like what colors make black or how to make the color black in real life.

Conclusion

“Primary colors” might sound like a grade-school art lesson, but they’re also the foundation for today’s color science. Once we understand the distinction between additive versus subtractive systems and that cyan magenta yellow must be seen as real subtractions primaries, I think colors are much better understood.

Whether we’re wondering how do you make black paint, learning about purple and green or trying to figure out what is the difference between additive color and subtractive color, physics of color provides us with reliable answers.