Free Knowledge – What is RGB

What is RGB

RGB is the colour space of Red, Green and Blue. These are the primary colours of light, which computer screens and televisions use to display images. RGB is required for projects that are designed to stay on screen (websites, pdfs, and other web graphics). Digital cameras and scanners create images using the RGB colour space. RGB colours often appear brighter and more vivid specifically because the light is being projected directly into the eyes of the viewer.

This is called an “additive” process in which the three colours are combined in different amounts to produce various colours. It is called “additive” because you must add varying amounts of two or more colours to achieve hues and values other than the three basic Red, Green and Blue colours.

These colours, however, can only be viewed with natural or produced light, such as in the computer monitor, and not on a printed page. An RGB file must be translated into the CMYK (the primary colours of pigment) colour space in order to be printed on a printing press.

In the RGB colour space equal proportions of:
Green and Blue create Cyan (C)
Red and Blue create Magenta (M)
Red and Green create Yellow (Y)