# 256 RGB Colours – Green to Cyan

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## Description

#### 256 RGB Colours - Green to Cyan

###### TRY SOME QUICK QUESTIONS AND ANSWERS TO GET STARTED
Red, green and blue are the three additive primary colours used in the RGB colour model.
Overlapping wavelengths of light corresponding with cyan, magenta and yellow make white because, when reflected off a neutral coloured surface, each adds more wavelengths to the reflected light.
No! The colours produced by mixing primary colours are not spectral colours. Spectral colours are produced by a single wavelength of light.
When red, green and blue lights are projected at equal intensity onto a dark surface they produce the appearance of white to an observer.

This is one of a series of six diagrams that together show all 1530 fully saturated colours in the RGB colour model.

Each diagram shows 256 colours starting with a primary and finishing with a secondary colour or visa-versa:

• 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 different proportion of green and blue light. The third primary colour, red, is always off.
• The diagram shows a stripe of green (primary colour) at the top, so, green has been turned to maximum and blue to minimum intensity.
• The stripe of cyan at the bottom results from both green and blue being set to maximum intensity to produce the secondary colour.
• The block of colour swatches between the stripes are made up of 16 rows and 16 columns.
• The first swatch at top left matches the green stripe: green = 00, 255, 00.
• The last swatch at bottom right matches the cyan stripe: cyan = 00, 255, 255.
• To make sense of this, 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.

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#### RGB colour

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#### Colour

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