Dictionary of light, colour & vision

About this dictionary

This DICTIONARY OF LIGHT, COLOUR & VISION contains a vocabulary of closely interrelated terms that underpin all the resources you will find here at lightcolourvision.org. Each term has its own ...

Absorption

When light strikes an object, some wavelengths are absorbed and their energy is converted to heat, others undergo reflection or transmission. About absorption When light is absorbed by an object ...

Accommodation

Accommodation refers to the way our eyes keep things in focus by simultaneously changing the shape of each lens. The result is sharp images of the world regardless of whether ...

Achromatic

Achromatic means without colour so refers to surfaces or objects that appear white, grey or black. Achromatic colours can be described in terms of their apparent brightness but are without ...

Additive colour

An additive approach to colour refers to a method of mixing different wavelengths of light to produce other colours. An additive approach to colour is used to produce the vast ...

Additive colour

Additive colour refers to the way any two or more wavelengths of light can be combined to produce another colour.  The RGB colour model, HSB colour model and Spectral colour ...

Adobe RGB colour space

The aim of a colour space is to ensure that a colour produced by a colour model is accurately reproduced when displayed on-screen, printed or made into paint. The Adobe ...

Amacrine cells

Amacrine cells are interneurons in the human retina that interact with retinal ganglion cells and/or bipolar cells. About amacrine cells Amacrine cells are a type of interneuron within the human ...

Amplitude

The amplitude of a wave is a measurement of the distance from the top of a crest through the centre line  (the still position, zero-point, mid-point) to the bottom of ...

Amplitude

The amplitude of an electromagnetic wave is a measurement of the distance from the centre line (or the still position) to the top of a crest or to the bottom ...

Analogous colours

Analogous colours are colours that are very similar to one another and appear next to each other on a colour wheel. About analogous colours Analogous colours are colours of similar ...

Angle of incidence

The angle of incidence measures the angle at which incoming light strikes a surface. The angle of incidence is measured between a ray of incoming light and an imaginary line ...

Angle of incidence

The angle of incidence measures the angle at which incoming light strikes a surface. About the angle of incidence The angle of incidence is measured between a ray of incoming ...

Angle of reflection

The angle of reflection measures the angle at which reflected light bounces off a surface. The angle of reflection is measured between a ray of light which has been reflected ...

Angle of reflection

The angle of reflection measures the angle at which reflected light bounces off a surface. About the angle of reflection The angle of reflection is measured between a ray of ...

Angle of refraction

The angle of refraction measures the angle to which light bends as it passes across the boundary between different media. The angle of refraction is measured between a ray of ...

Angle of refraction

The angle of refraction measures the angle to which light bends as it passes across the boundary between different media. About the angle of refraction The angle of refraction is ...

Anti-solar point

The point on the rainbow axis around which the arcs of a rainbow appear is called the anti-solar point. An imaginary straight line can always be drawn that passes through ...

Atom

An atom is the smallest particle that can be described as a chemical. About atoms At the centre of an atom is a nucleus containing protons which are positively charged ...

Attributes of visual perception

Attributes of visual perception are the innate abilities, and the skills we develop over the course of a lifetime, that enable us to make sense of what we see. They ...