1. Version 1.0, 30 June 2004 APPLICATIONS OF METEOSAT SECOND GENERATION (MSG) RGB IMAGES: PART 02 INTRODUCTION TO RGB COLOURS Author:Jochen Kerkmann (EUMETSAT) kerkmann@eumetsat.de

2. Version 1.0, 30 June 2004 PART 2: INTRODUCTION TO RGB COLOURS

3. Version 1.0, 30 June 2004 Red, Green, Blue: The three colours of light which can be mixed to produce any other colour. Coloured images are often stored as a sequence of RGB triplets or as separate red, green and blue overlays though this is not the only possible colour representation*. These colours correspond to the three "guns" in a colour cathode ray tube and to the colour receptors in the human eye. Definition of RGB Colours *Other commonly used colour representations are: The CMYK colour model (Cyan Magenta Yellow and Key (black)) The HSV colour model (Hue Saturation Value)

4. Version 1.0, 30 June 2004 The Colour Circle

5. Version 1.0, 30 June 2004 RGB Colour Values RGB colors are defined using a decimal or hexadecimal notation for the combination of Red, Green, and Blue color values (RGB). The lowest value that can be given to one light source is 0 (hex #00). The highest value is 255 (hex #FF).

6. Version 1.0, 30 June 2004 More RGB Colour Values Examples of colours (names) and 8-bit RGB values: –Red255, 0, 0 –Fuchsia255, 0, 255 –Skyblue153, 206, 235

7. Version 1.0, 30 June 2004 RGB Colour Names A collection of color names are supported by Internet Browsers. Below, are some examples: