| Abstract
In this work, we analyse and compare several
linear and non-linear colour representation spaces at different physiological
levels, show the relationships between spaces and discuss the mathematical
properties they should exhibit. At the photoreceptor level we examine the
cone excitation and cone contrast spaces. We discuss the
second-stage spaces, usually known as ATD-spaces, paying particular attention
to Boynton's space and including a non-linear space, the opponent modulation
space. In addition, we approach third-stage transformations, which
might take place at the cortical level. Finally, we analyse a perceptual
ATD-type space, discussing how it might be derived as a third-stage transformation
of an LGN-based ATD-space.
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