Colour is an integral part of most visual representations.
In this issue we review the fundamental uses of colour to convey information.
Colour is an attribute that is not strictly necessary in order to distinguish shapes or to perceive the real world in a sufficiently operative way, as anybody that has seen black and white TV or photography can state.
Nevertheless, colour is excellent to convey emotions, to label and categorise, but poor in showing shapes, details or space, where luminance (intensity) and contrast play the fundamental role. For this reason two channels of information...
