The color impression an observer gets from a sample depends on three interrelated factors.
1. Light source
Different light sources (e.g. daylight, filament lamp) feature different intensities of their individual spectral components and therefore produce different color impressions.
2. Sample
The composition of the sample defines the components of reflection, absorption and refraction and thus the entire spectral composition of the reflection spectrum.
3. Observer
Different sensitivities of the three light-sensitive receptors on the retina convey different color impressions with different observers.
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