Abstract
The CIE 1976 ( L ∗ u ∗ v ∗ ) system, abbreviated CIELUV, has been widely used for specification of colours, for specification of colour differences, and for selection of colours presented on CRT screens. However, VDU colours have not earlier been visually presented as a virtual colour atlas with coloured patches occupying the appropriate positions in the CIELUV colour space. In this paper, CIELUV is illustrated by displaying the colours of 4 096 digital RGB combinations in chroma ( C ∗ uv ) — lightness ( L ∗ ) diagrams at five-degree increments in hue angle ( h uv) around the entire CIELUV hue circle. The 4 096 colours are quite nonuniformly distributed in the space. In particular, some yellows, blue-greens, and oranges are completely inaccessible by the VDU because of sparse sampling. Thus sampling, as well as gamut constraints, limit the colours accessible on a VDU.
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