•
Standard illuminants B and C: CIE Standard illuminant -B and C are defined to
represent as simulated direct sunlight, as equivalent light source from a tungsten
filament (as radiator) when heated at 4874°K and 6774°K respectively (as
respective correlated colour temperature). But, Standard illuminants B and C are
not so much used and are being dropped because they are seriously too much
deficient in the UV region (important for fluorescent materials)
•
Standard Observer: There are two angular view areas considered as standard
viewing areas called 2
0
standard observer (small area of view) and 10
0
standard observer (large area of view) as shown in
Figure 10 [1–3]. As
recommended by CIE, in 1964, the larger area of view of solid samples
mounted for colour measurement on sample port of UV VIs reflectance
spectrophotometer is most widely used for evaluating colour values and for
colour matching of various types of solid samples including textiles. Ordinary
Colorimeters, on the other hand, typically use a 2
0
Standard Observer (as per
CIE, 1931), which has a smaller area of view and is common for general colour
measurement and colour quality control and evaluation purposes for
comparative purposes and also for printed textiles.
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