Perceptual Indiscriminability and the Concept of a Color Shade
This chapter investigates the connection between indiscriminability with respect to colour, and the concept of a colour shade. A crucial question is whether indiscriminability is a transitive relation. If it is, then a simple identity criterion for colour shades can be straightforwardly expressed in terms of indiscriminability. If it is not, then we are driven to a less immediate identity criterion for colour shades, which is however still intimately linked to indiscriminability. In this situation, there is a sense in which the concept of a colour shade must be taken to be a low-level theoretical notion.
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