Transcript RGB part 02 - Introduction to RGB colours

APPLICATIONS OF
METEOSAT SECOND
GENERATION (MSG)
RGB IMAGES: PART 02
INTRODUCTION TO RGB COLOURS
Author:
Version 1.0, 30 June 2004
Jochen Kerkmann (EUMETSAT)
[email protected]
PART 2:
INTRODUCTION TO RGB COLOURS
Version 1.0, 30 June 2004
Definition of RGB Colours
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.
* Other commonly used colour representations are:
• The CMYK colour model (Cyan Magenta Yellow and Key (black))
• The HSV colour model (Hue Saturation Value)
Version 1.0, 30 June 2004
The Colour Circle
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).
Version 1.0, 30 June 2004
More RGB Colour Values
Examples of colours (names)
and 8-bit RGB values:
– Red
– Fuchsia
– Skyblue
255, 0, 0
255, 0, 255
153, 206, 235
Version 1.0, 30 June 2004
RGB Colour Names
A collection of color names are supported by Internet Browsers.
Below, are some examples:
Version 1.0, 30 June 2004