Colour Theory: Colour Systems

Colour Systems

Subtractive colours are made when using a white light to illuminate colours. When we see objects of nature, we see wavelengths of white light that reflects off an object and causes us to be able to see colour. Objects can make colour by subtracting or absorbing precise wavelengths. So the the light source, such as the sun, sends waves on to the object, then we see the colour as the viewer.

This system involves colourants and reflected light. Subtractive colour begins with an object; like a piece of blank paper. The piece of paper reflects light using colourants/dyes. For something to appear white, all the white light would have to be reflected back to the viewer. The colourants are used to subtract parts of the white light then illuminating an object to create more colours. For something to appear black, an object will subtract all the light illuminating it. This way no light can be reflected back to the viewer and it appears black. This process helps us to see colours around us.

This process is used in paintings and photography. Using painting as an example, you would often use a blank, white, canvas to paint on to. The white canvas acts as a reflector. Additive colours work for how we see colours computer screens and tv screens