Spectral power distributions for the CIE stimuli
The CIE reference colour stimuli, X, Y, and Z, were derived by constructing a triangle outside the R,G,B triangle and outside the area bounded by the spectrum locus and the purple line. By this means, all colours, including monochromatic ones, have positive tristimulus values. The colour-matchi...
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| Principais autores: | , |
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| Formato: | article |
| Idioma: | English |
| Publicado em: |
Wiley Periodicals, LLC
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| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/45231 |
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| Resumo: | The CIE reference colour stimuli, X, Y, and Z,
were derived by constructing a triangle outside the R,G,B
triangle and outside the area bounded by the spectrum locus
and the purple line. By this means, all colours, including
monochromatic ones, have positive tristimulus values. The
colour-matching functions are the relative quantities of
these stimuli required to be mixed additively to match the
equal energy monochromatic colours. The stimuli are not
realizable as light sources, and the CIE has not specified
their spectral power distributions. There is an infinite num ber of spectral power distributions whose properties meet
the prerequisites for X (X 5 100, Y 5 0, Z 5 0), Y (0, 100,
0), and Z (0, 0, 100), and two possible sets have been
calculated by different methods. These curves could be used
as primary red, green, and blue lights in additive mixing to
produce synthetic reflectance curves, which are useful in the
specification of on-screen colours, and as a means of pro ducing colour constant standards |
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