Overlapping Beams of R & G Make Yellow

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This is one of a set of 3 diagrams showing pairs of RGB primary colours projected onto a neutral coloured surface.

In this diagram red and green primary colours overlap to produce yellow.

Understanding the diagrams:

  • The diagrams illustrate how the RGB colour model works in practice.
  • The two primary colours have the same intensity.
  • Each torch points towards a different area of the surface so they overlap.
  • The light in each case is of a single wavelength so produces a spectral colour.
  • The selected wavelengths are: red = 660 nanometres (nm), green = 525 nm.
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Description

Overlapping Beams of R & G Make Yellow

TRY SOME QUICK QUESTIONS AND ANSWERS TO GET STARTED
Can the spectral colours red, green and blue be produced by combining other wavelengths of light?
No! Red, green and blue are primary colours within additive colour models and can only be produced by a single wavelength of light.
What are additive primary colours?
Additive primary colours are three wavelengths of light that produce white when combined together in equal proportions.

About the diagram

About the diagram
  • This is one of a set of 3 diagrams showing pairs of RGB primary colours projected onto a neutral coloured surface.
  • In this diagram red and green primary colours overlap to produce yellow.
Understanding the diagrams
  • The diagrams illustrate how the RGB colour model works in practice.
  • The two primary colours in each diagram are of the same intensity.
  • The light sources are arranged so that the colours overlap.
  • The light source in each case is produced by a single wavelength of light.
  • The selected wavelengths are: red = 660 nanometres (nm), green = 525 nm.
About the RGB colour model
  • RGB colour is an additive colour model that combines wavelengths of light corresponding with the red, green and blue primary colours to produce other colours.
  • RGB colour is called a model because it is a method that can be followed to produce any colour from a combination of red, green and blue light sources.
  • Red, green and blue are called additive primary colours in an RGB colour model because they can be added together to produce other colours.
  • When mixing light, each RGB primary colour is called a component of the resulting colour.
  • Different colours are produced by varying the intensity of the component colours between fully off and fully on.
  • When the light sources that produce the red, green and blue primary colours are at full intensity, together they produce white.
  • Each light source at full intensity produces a fully saturated colour.
  • When any two fully saturated RGB primaries are combined they produce a secondary colour (yellow, cyan or magenta).
  • Some applications of the RGB colour model can produce over 16 million colours by varying the intensity of each of the three component primary colours.
  • The additive RGB colour model cannot be used for mixing opaque pigments, paints or powders. To understand these colourants find out about subtractive colour models.
  •  The RGB colour model does not define the precise wavelength (or band of wavelengths) for the three primary colours.
  • When the exact composition of primary colours are defined, the colour model then becomes an absolute colour space.

Some key terms

White light

White light is the name given to visible light that contains all wavelengths of the visible spectrum at equal intensities ...

Primary colour

Primary colours are a set of colours from which others can be produced by mixing (pigments, dyes etc.) or overlapping ...

What is the trichromatic colour model?

The trichromatic colour model is a theory of colour that establishes terms, rules and methods to enable human colour vision ...

Colour wheel

A colour wheel is a diagram based on a circle divided into segments. The minimum number of segments is three ...

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