By M. L. Gulrajani
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Additional info for Colour Measurement: Principles, Advances and Industrial Applications
Sample text
1 2 3 4 5 6 As represented by physical samples, the systems are realistic and easy to understand. It is easy for the eye to specify object colours by comparison with reference to physical samples, rather than by matching with colours in memory (Hunter and Harold, 1978: 300). The atlases are easy to use. In most cases, side-by-side comparisons are made under standard viewing conditions and, as such, no instrument is required. The systems based on perceptual scaling like Munsell and NCS can be used to evaluate mathematical colour appearance models.
Finally, there are other non-linear models that succeed in explaining effects resulting from adaptation to a light source, and the influence of the background and the environment surrounding the stimulus, etc. In this case, non-linearities need to © Woodhead Publishing Limited, 2010 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 20 1 2 3 4 5 6 7 8 9 30 1 2 3 4 5 6 7 8 9 40 1 2 43X 10 1 2 3 4 5 6 7 8 9 10 1 2 Colour measurement be introduced into the ATD response calculation. The 1990 Guth model, and subsequent modifications up to 1995, are a good example of these models.
Moreover the user will be completely unaware of such changes. Most of the colour order systems cannot be used for self-luminous colours such as light sources unless ancillary apparatus is used. Though colour order systems are used for a variety of applications in colour appearance, they are not a substitute for a colour appearance model. The relation between perceptual coordinates of the colour order systems and colorimetric coordinates are complex and cannot be expressed by accurate equations.