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Colour Vision and Graphics

Colour is a fundamental aspect of our visual experience that helps us identify objects and interact with the world. The colour lab undertakes research in colour constancy and colour appearance. We are also interested in various aspects of normal and abnormal colour perception, in how and where colour is analysed by the visual system and in optimising colour display and conversion systems.

Colour Memory and Colour Constancy

Thanks to colour constancy your favourite t-shirt appears to be the same colour inside, under artificial light, as it would outside, under natural light even though the spectral distribution of the light that reaches your eyes has changed.

To achieve good colour constancy it is fundamental to have good colour memory. In our lab we use real object and lights as well as computer displays to try to understand how colour constancy happens and how it is related to other phenomena such as colour memory, adaptation and contrast.

Colour in Computer Graphics

High Dynamic Range Imaging & Compression

High Dynamic Range (HDR) Imaging allows the capture of the entire luminance range of a natural scene. HDR displays can have a luminance output of up to 3000 cd/m2 and thus a contrast ratio of 1:30,000. They create a very vivid viewing experience for the observer.

Colour to Greyscale conversion

Tone-mapping operators (TMO) compress the high dynamic range to fit the range of a standard monitor. Our aim is to identify the best possible compression.

Church window colour to greyscale