Observation conditions

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Observation conditions
The observation of a coloured object depends on the observation conditions, which themselves depend on the light source (illuminant) and the observer.

The CIE (International Commission on Illumination) has defined 3 principal standard illuminants:
Illuminant D65, which reproduces average daylight
Illuminant A, representative of incandescent sources
Illuminant F11, which reproduces neon lighting
Did you know?
The actual colour perceived is very dependent on the illuminant. The term metamerism is used when two colours, identical underneath a given illuminant, appear different under another illuminant.
The CIE has also defined 2 standardised observers representing the average human observer with normal vision:
The 2° observer, corresponding to the vision of an object of small size.
The 10° observer, corresponding to the analysis of an object in normal vision.

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