Overlapping Beams of R & G Make Yellow
Overlapping Beams of R & G Make Yellow
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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
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