1530 RGB Colours – Colour picker

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This diagram shows all 1530 fully saturated colours in the RGB colour model. 

The diagram splits the total of 1530 into blocks of 256 colours with each block starting with a primary and finishing with a secondary colour or visa-vera. The six segments are:

  • Red (primary colour) to yellow (secondary colour)
  • Yellow (secondary) to green (primary)
  • Green (primary) to cyan (secondary)
  • Cyan (secondary) to blue (primary)
  • Blue (primary) to magenta (secondary)
  • Magenta (secondary) to red (primary)
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Description

1530 RGB Colours - Colour picker

TRY SOME QUICK QUESTIONS AND ANSWERS TO GET STARTED
Are red, green and blue used to produce secondary colours when using the RGB and HSB colour models?
Yes! The primary colours red, green and blue are used to produce secondary colours when using the RGB and HSB colour models.
Do mixtures of RGB primary colours produce spectral colours?
No! The colours produced by mixing primary colours are not spectral colours. Spectral colours are produced by a single wavelength of light.
What are the three RYB primary colours?
Red, yellow and blue are the three primary colours used with the RYB colour model.
How many secondary colours in an RGB colour wheel with six colours?
There are three secondary colours in an RGB colour wheel, one between each pair of primaries.

About the diagram

This diagram shows all 1530 fully saturated colours in the RGB colour model.

The diagram splits the total of 1530 into blocks of 256 colours with each block starting with a primary and finishing with a secondary colour or visa-versa. The six segments are:

  • Red (primary colour) to yellow (secondary colour)
  • Yellow (secondary) to green (primary)
  • Green (primary) to cyan (secondary)
  • Cyan (secondary) to blue (primary)
  • Blue (primary) to magenta (secondary)
  • Magenta (secondary) to red (primary)

Understanding the diagram

  • All the colours in this diagram have been produced by mixing pairs of primary colours. The third primary colour in any swatch is set to zero – off.
  • The diagram is made up of six blocks each made up of 16 rows and 16 columns.
  • The first block starts with red and ends with yellow. The second starts with yellow and ends with green.
  • So yellow appears twice, once at the end and then again at the beginning of the next block.
  • This arrangement repeats through the diagram so there are a total of 1536 swatches but a total of 1530 different colours.
  • To make sense of the overall relationship of colours, it helps to understand how RGB colour notation works:
  • When mixing any RGB colour, three numbers (separated by commas) show how much red, green and blue light is to be used.
  • The minimum value for each light source is 0. In this case the light is fully off.
  • The maximum value for each light source is 255. In this case the light source is fully on.
  • As each number increases so does the intensity of the corresponding light but the wavelength, and so the colour we see, stays the same.
RGB colour values
Light source Red Green Blue
Maximum value for each light source (fully on) 255 , 255 , 255
Values between 0 and 255 1 to 254 1 to 254 1 to 254
Minimum value for each light source (fully off) 0 , 0 , 0

RGB colour values

Now let’s look at RGB colour values in detail

RGB colour values are represented by decimal triplets (base 10) or hexadecimal triplets (base 16). These triplets are used in software and apps to select a colour.

  • In decimal notation, an RGB triplet is used to represent the values of red, then green, then blue.
  • Decimal numbers between 0 and 255 are selected for each value:
  • Red = 255, 00, 00
  • Yellow = 255, 255, 00
  • Green = 00, 255, 00
  • Cyan = 00, 255, 255
  • Blue = 00, 00, 255
  • Magenta = 255, 00, 255
  • In hexadecimal notation, an RGB triplet is used to represent the value of red, then green, then blue.
  • Hexadecimal numbers between 00 and FF are selected for each value.
  • The hash symbol (#) is used to indicate hex notation:
  • Red = #FF0000
  • Yellow = #FFFF00
  • Green = #00FF00
  • Cyan = 00FFFF
  • Blue = #0000FF
  • Magenta = #FF00FF
  • The sequence of hexadecimal values between 1 and 16 are: 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E and F.
  • The sequence of hexadecimal values between 17 and 32 are: 10,11,12,13,14,15,16,17,18,19,1A,1B,1C,1D,1E and 1F.

Some key terms

Colour model

A colour model is the how-to part of colour theory. Together they establish terms and definitions, rules or conventions and a system of notation for encoding colours and their relationships with one another.

A colour model is a way of:

  • Making sense of the colours we see around us in the world.
  • Understanding the relationship of colours to one another.
  • Understanding how to mix each type of coloured media to produce predictable results.
  • Specifying colours using names, codes, notation, equations etc.
  • Organising and using colours for different purposes.
  • Using colours in predictable and repeatable ways.
  • Working out systems and rules for mixing and using different types of colour.
  • Creating colour palettes, gamuts and colour guides.
Secondary colour

A secondary colour is a colour made by mixing two primary colours in a given colour space. The colour space may be produced by an additive colour model that involves mixing different wavelengths of light or by a subtractive colour model that involves mixing pigments or dyes.

RGB colour model
  • To be clear about the RGB colour model it is useful to remember first that:
    • The visible spectrum is the range of wavelengths of the electromagnetic spectrum that correspond with all the different colours we see in the world.
    • A spectral colour is a colour corresponding with a single wavelength of visible light, or with a narrow band of adjacent wavelengths.
    • The human eye, and so human perception, is tuned to the visible spectrum and so to spectral colours between red and violet. However, because of the way the eye works, we can see many other colours which are produced by mixing colours from different areas of the spectrum. A particularly useful range of colours is produced by mixing red, green and blue light.
    • RGB colour is an entirely different approach to producing and managing colour.
  • RGB colour is an additive colour model in which red, green and blue light is combined in various proportions to reproduce a wide range of other colours. The name of the model comes from the initials of the three additive primary colours, red, green, and blue.
  • Except for the three primary colours, RGB colours are not spectral colours because they are produced by combining colours from different areas of the visible spectrum.
  • RGB colour provides the basis for a wide range of technologies used to reproduce digital colour.
  • RGB colour provides the basis for reproducing colour in ways that are well aligned with human perception.
  • When an observer has separate controls allowing them to adjust the intensity of overlapping red, green and blue coloured lights they are able to create a match for a very extensive range of colours.
  • When looking at any modern display device such as a computer screen, mobile phone or projector we are looking at RGB colour.
  • Magenta is an RGB colour for which there is no equivalent spectral colour.
Additive colour

Additive colour mixing combines wavelengths of light to produce the vast array of hues an observer sees on TV, computer and phone screens.

Colour models that use an additive approach to colour include:

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