# Overlapping Beams of G & B Make Cyan

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

In this diagram green and blue primary colours overlap to produce cyan.

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: green = 525, blue = 460 nm.
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## Description

#### Overlapping Beams of G & B Make Cyan

###### TRY SOME QUICK QUESTIONS AND ANSWERS TO GET STARTED
No! Red, green and blue are primary colours within additive colour models and can only be produced by a single wavelength of light.
Additive primary colours are three wavelengths of light that produce white when combined together in equal proportions.
Yes! Every colour on an additive colour wheel is produced by mixing light sources with different hues but the same brightness and saturation.
No! Red, green and blue are primary colours within additive colour models and can only be produced by a single wavelength of light.

#### 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 green and blue primary colours overlap to produce cyan.
###### 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: green = 525 nanometres (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 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 is the name given to visible light that contains all wavelengths of the visible spectrum at equal intensities.

• As light travels through a vacuum or a medium it is described as white light if it contains all the wavelengths of visible light.
• As light travels through the air it is invisible to our eyes.
• When we look around we see through the air because it is very transparent and light passes through it.
• The term white light doesn’t mean light is white as it travels through the air.
• One situation in which light becomes visible is when it reflects off the surface of an object.
• When white light strikes a neutral coloured object and all wavelengths are reflected then it appears white to an observer.
• A colour wheel is a circular diagram divided into segments, featuring primary colours, and used to visualize the result of colour mixing.
• Colour wheels can enhance understanding of colour relationships and assist with the accurate selection and reproduction of colours.
• A colour wheel starts with segments representing primary colours. Additional segments are added between them to explore the outcome of mixing adjacent primary colours.
• By adding more segments between existing ones, further mixing of adjacent colours can be explored.
• A colour wheel exploring the additive RGB colour model starts with red, green, and blue primary colours.
• A colour wheel exploring the subtractive CMY colour model starts with cyan, magenta, and yellow primary colours.

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

• The human eye, and so human perception, is tuned to the visible spectrum and so to spectral colours between red and violet. It is the sensitivity of the eye to the electromagnetic spectrum that results in the perception of colour.
• A set of primary colours is a set of pigmented media or coloured lights that can be combined in varying amounts to produce a wide range of colour.
• This process of combining colours to produce other colours is used in applications intended to cause a human observer to experience a particular range of colours when represented by electronic displays and colour printing.
• Additive and subtractive models have been developed that predict how wavelengths of visible light, pigments and media interact.
• RGB colour is a technology used to reproduce colour in ways that match human perception.
• The primary colours used in colour-spaces such as CIELAB, NCS, Adobe RGB (1998) and sRGB are the result of an extensive investigation of the relationship between visible light and human colour vision.
• A colour model, underpinned by a colour theory, provides a precise and replicable approach to understanding:
• How the human eye perceives light and interprets colour.
• Different types of colour such as the colours produced when mixing lights, pigments or inks.
• How to manage the diverse ways colour is processed by equipment such as cameras, digital screens and printers.
• Whether or not we recognize it, whenever we are working with colour, we are adopting a colour theory, a colour model and a colour space.

RGB colour is an additive colour model in which red, green and blue light is combined to reproduce a wide range of other colours.

• The primary colours in the RGB colour model are red, green and blue.
• In the RGB model, different combinations and intensities of red, green, and blue light are mixed to create various colours. When these three colours are combined at full intensity, they produce white light.
• Additive colour models are concerned with mixing light, not dyes, inks or pigments (these rely on subtractive colour models such as the RYB colour model and the CMY colour model).
• The RGB colour model works in practice by asking three questions of any colour: how red is it (R), how green is it (G), and how blue is it (B).
• The RGB model is popular because it can easily produce a comprehensive palette of 1530 vivid hues simply by adjusting the combination and amount of each of the three primaries it contains.

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