Colours are basically Lights of different wavelengths which hit in our eye.
There has two kind of colour models,
Additive colour model
Subtractive colour model
Additive Colour Model:
The additive colour model is intended for devices that deal with emitted light, such as your camera and your computer monitor.
Here colours directly come to eye from light source.
In this model Primary colours are Red, Green and Blue (RGB).
When two or three primary colours are added it became brighter in our eye.
Red + Green = Yellow
Green + Blue = Cyan
Blue + Red = Magenta
Red + Green + Blue = White
Subtractive Colour Models:
The subtractive colour system starts with white light and subtracts light to produce colours.
As an example think, there has a Red Apple under the Sun. Sun emits all seven colours (Violet, Indigo, Blue, Green, Yellow, Orange and Red). When it hits the Apple, it absorbs all colour except Red. Then our eye see the reflected Red colour. So, Apple subtrac all colours except Red.
All kind of colour we use in daily life is subtractive colour, like in painting etc.
This kind of colour known as colour pigment.
In this model primary colours are Red, Yellow and Blue.
Printers also use subtractive colour system. But in printer there has normally Four cartridges and the primary colours are different there. They are Cyan, Magenta, Yellow and Black (CMYK). (In CMYK, 'K' is basically key Which is Black.)
It has a reason. Basically when we use colour pigments, we mix them. But in printing process transparent colours are layered on top of each other on a White surface. That time CMYK works well. Black is used because by transparent colours on top of a white surface it is impossible to create any opaque Black or blackish colour.
CMYK only used in printer.
In subtractive colour models when two or three primary colours are added it became darker in our eye.
Red + Yellow = Orange
Yellow + Blue = Green
Blue + Red = Purple
Red + Yellow + Blue = Black
But in real life when we mix Red, Yellow and Blue colours in equal amount we never can get Black colour. We get a dark shade of Gray colour. Because when any White light hits the mixture of colours it reflects back little bit of Red, Yellow and Blue colours.
Actually there has no pure Black object around.
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