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Appendix
1. The Color of Objects
There are three major elements to perceive color: light, object and observer. Any change
of these three elements will influence the observer’s color perception. When the light
source and the observer don’t change, then the object will determine the observer’s color
perception.
Objects can affect the final color perception because the reflectance spectra
(transmittance spectra) of the object have modulated the light source spectrum. Different
objects have different reflectance spectra (transmittance spectra). The light source
spectrum modulates the reflectance spectra (transmittance spectra) of different objects to
obtain different results. The observer is the same, so it shows different colors. The theory
is shown in the figure below.
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