![]() Rainbow colours are the bands of colour seen in rainbows and in other situations where visible light separates into its component wavelengths.It is the sensitivity of the eye to this small part of the electromagnetic spectrum that results in the human perception of colour. The human eye is tuned to the visible spectrum and so to spectral colours between red and violet.Spectral colours relate to the visible spectrum and so to the rainbow colours ROYGBV. The RGB colour model (RGB colour) should not be confused with the spectral colour model (spectral colour).Then step back to see how different colours appear when all the pixels merge together. Look at a computer screen or TV using a magnifying glass to see the three RGB primary colours. In computer software and apps by selecting RGB colours using swatches or by selecting RGB colour values (codes) using decimal or hexadecimal notation.On a computer or mobile phone screen by juxtaposing tiny dots of light corresponding with the three primary colours, red, green and blue.The range of colours that can be produced on a computer screen by an RGB colour wheel is limited only by the system of notation, the resolution of the device they are displayed on and by the ability of an observer to distinguish between similar colours.Additional colours are produced by continuing to overlap equal intensities of adjacent pairs of colours.Mixtures of equal intensities of pairs of secondary colours are called tertiary colours on a colour wheel with twelve segments.Yellow, cyan and magenta are called secondary colours and fill the segments between the primary colours on a colour wheel with six segments. ![]() Where blue and a red light sources overlap they produce magenta.Where green and blue light sources overlap they produce cyan.Where red and green light sources overlap they produce yellow.When exploring RGB colour wheels the first thing to establish is what happens where pairs of primary colours of equal intensities overlap.These are filled with the red, green and blue additive primary colours. RGB colour wheels have a minimum of three segments.For everyday purposes, the most straight forward way to explore the RGB colour model is on a computer using software that allows different RGB colours to be selected.Colour wheels however are usually divided into segments like the spokes of a wheel on a bicycle. ![]() When coloured lights are projected and focused onto a surface they form overlapping circles.The wavelengths of the light they output are set to values such as: In laboratory conditions, light sources are of equal intensity when fully on but can be turned down in 256 equal steps till fully off.The purpose of an RGB colour wheel is to demonstrate or simulate the effect of projecting coloured lights, corresponding with the additive primaries (red, green and blue), onto a dark surface. ![]() Minimum value for each light source (fully off) Maximum value for each light source (fully on)
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