# Colour notation

Colour notation refers to the codes used by colour models to identify and store colour values in a form recognisable to both computers and humans.

##### RGB Colour Model

The RGB colour model uses both decimal and hexadecimal triplets for colour notation. So RGB notation looks like this:

• R=255, G=128, B=0 is the decimal notation for orange.
• #FF8000 is the hexadecimal notation for orange.
##### HSB Colour Model

The HSB colour model uses decimal triplets for colour notation. So an HSB notation looks like this:

• H=30, S=100, B=100 is the notation for orange.
##### CMYK Colour Model
• The CMYK colour model uses decimal quadruplets for colour notation. So a CMYK notation looks like this:
•  C=0, M=61, Y=100, K=0 is the notation for orange.
• Each model involves a different method of encoding colours and each is used for different purposes. RGB, for instance, is commonly used for electronic displays, while CMYK is often used for printing.
• HSB, also known as HSV (Hue, Saturation, Value), is a cylindrical representation of RGB and is more intuitive for humans to understand and manipulate.
• Conversion between different forms of notation does not always result in an exact match due to the differences in colour gamuts.
• Colour notation refers to the codes used by colour models to identify and store colour values in a form recognizable to both computers and humans.
• For example, the RGB colour model uses both decimal and hexadecimal triplets for colour notation. So RGB notation looks like this:
• R=255, G=128, B=0 is the decimal notation for orange.
• #FF8000 is the hexadecimal notation for orange.