Blue Light on a Dark Surface

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This is one of a set of 3 diagrams showing torches projecting red, green and blue light onto a neutral coloured surface.

A fourth diagram shows what happens when all three torches are turned on at the same time and their beams partially overlap one another.

Understanding the diagrams:

  • The diagrams illustrate how the RGB colour model works in practice.
  • Each torch emits light at the same intensity.
  • Each torch points towards a different area of the surface.
  • 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, blue = 460 nm.
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Description

Blue Light on a Dark Surface

TRY SOME QUICK QUESTIONS AND ANSWERS TO GET STARTED
What are the two RGB primary colours that together make magenta?
Blue and red are the two primary RGB colours that together make magenta!
Name the three RGB primary colours that can together produce white light?
When red, green and blue lights are projected at equal intensity onto a dark surface they produce the appearance of white to an observer.
What are the two primary colours of light that together make yellow?
Red and green are the two primary colours of light that together make yellow.
How many primary colours in an RGB colour wheel?
There are three primary colours in an RGB colour wheel.

Some key terms

About the diagram
  • This is one of a set of 3 diagrams showing torches projecting red, green and blue light onto a neutral coloured surface.
  • A fourth diagram shows what happens when all three are on at the same time and their beams partially overlap one another.
Understanding the diagrams
  • The diagrams illustrate how the RGB colour model works in practice.
  • Each torch emits light at the same intensity.
  • Each torch points towards a different area of the surface.
  • 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, blue = 460 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 a full gamut of colours.
  • Red, green and blue are called additive primary colours in an RGB colour model because they can be added together to produce all other colours.
  • Each of the three beams 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 any two fully saturated additive primaries are combined they produce a secondary colour: yellow, cyan and magenta.
  • When fully saturated red, green and blue primary colours are combined they produce white.
  • Some RGB colour models can produce over 16 million colours by varying the proportion and intensity of each of the three component primary colours.
  • The additive RGB colour model cannot be used for mixing different colours of pigments, paints, inks, dyes or powder. To understand these colourants find out about subtractive colour.

Diagrams are free to download

Primary colour

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

Light source

A light source is a natural or man-made object that emits one or more wavelengths of light. The Sun is ...

Colour model

A colour model is the how-to part of colour theory. Together they establish terms and definitions, rules or conventions and ...

Wavelength

Wavelength is a measurement from any point on the path of a wave to the same point on its next ...

Diagrams are free to download

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