1. Introduction

In colour reproduction, it is generally important for different reasons to know beforehand the colour gamut of reproducible colours (Berns, 2000). Some industries applying industrial colorimetry, such as textiles, plastics, leather, paints, usually keep a data base with their colour gamut, which only occasionally, following commercial criteria and fashion, is reproduced in a sampler to allow the customers to judge the colour generating apabilities of the manufacturer. However, few enterprises study whether their colour gamut reaches the MacAdam limits (see Appendix) or whether it covers more or less homogeneously the Rsch-MacAdam colour solid (Berns, 2000; Kuehni, 2003). Pointer, in 1980, was one of the first scientists to study this problem (Pointer, 1980). In 2002, Pointer retook this subject, asking for the collaboration of all persons interested in the matter, to generate a large database of colour gamuts in current industry (Pointer, 2002). We are particularly interested in this subject, both in those aspects related to the comparison between the colour gamuts of different industries and the MacAdam limits and in those aspects related to how the colour solid is filled, whether homogeneously or leaving certain void regions.

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