Download Colour Perception: Mind and the Physical World by Rainer Mausfeld, Dieter Heyer PDF

By Rainer Mausfeld, Dieter Heyer

Univ. of Kiel, Germany. offers an outline of the modern advancements in our realizing of colours and of the connection among the 'mental' and the 'physical'. Discusses mild and distinction edition, human colour imaginative and prescient, the processing of chromatic details, the interplay of colour and movement, and extra. For researchers.

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Extra info for Colour Perception: Mind and the Physical World

Sample text

Thus these numbers have no invariant meaning at all. However, it is easy to show (because of linearity) that the colour spaces for different choices of primaries are all affinely equivalent, that is to say, they are all related through linear maps (deformations, represented by non-singular 3 × 3 matrices) that depend only on the change of primaries. Such maps merely ‘relabel’ the colours and establish isomorphisms between the representations. Seen through ‘affine spectacles’ there exists only a single colour space and all specific representations only appear different, like the different perspectives of a single city.

What does this mean? It means that we will write any beam with spectrum s (say) as the sum of two components, an (often virtual) ‘fundamental beam’ with spectrum f ∈ F and an (always virtual) ‘black’ beam b ∈ B, thus s = f + b. We will do this in such a way that the fundamental component yields the colour of the beam, that is to say c = AT s = AT f , whereas the black beam yields the black colour (the origin of C, hence the name), that is to say AT b = o. This can always be done and in a unique manner.

Then the curve frolics around in C, only to return towards o again when the wavelength approaches 740 nm, the long wavelength or ‘red’ limit of the visual spectrum (for infrared (IR), microwaves and radiowaves are also equivalent to total darkness). The curve leaves o and returns to o via different directions. 6 Two views of the spectral locus and the plane of purples. The plane of purples (p) is spanned by the two tangents at the origin (O) of the locus of equienergetic monochromatic beams (s).

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