Spectral Colours & RGB Colours
Spectral Colours & RGB Colours
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About the diagram
About the diagram
- This diagram shows the six spectral colours associated with the colours of the rainbow.
- The top half of the diagram shows that each of these spectral colours can be produced by a single wavelength of light.
- The bottom half of the diagram shows that three spectral colours (red, green and blue) can be combined in pairs to produce orange, yellow and violet.
- Spectral colours are produced by a single wavelength of light. So each individual wavelength of visible light produces a different spectral colour.
- Rainbows are produced by spectral colours as sunlight is refracted and dispersed by raindrops.
- Red, orange, yellow, green, blue and violet are familiar spectral colours.
- The visible spectrum contains a continuum of spectral colours.
- The wavelength corresponding with each colour is shown in nanometres (nm). The wavelengths selected for each colour are for illustration only.
- In practice, the choice of wavelengths for primary colours usually depends on factors such as the colour model being used, the gamut of colours that a display device can produce and the context in which colours are to be viewed.
- The visible spectrum is a small part of the electromagnetic spectrum.
- Spectral colours should not be confused with RGB colours.
- Spectral colours relate to the visible spectrum.
- RGB colours are produced by mixing wavelengths using the three primary colours, red, green and blue.
- A demonstration of RGB colour is often presented in the form of a colour wheel.
- In a continuous spectrum of wavelengths, separate colours are indistinguishable to the human eye.
- The fact that we see distinct bands of colour in a rainbow is an artefact of human colour vision.
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