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15
Appendix
15.1
Colour
When observing colours, there are three elements: light source, object and observer.
Changes in one of these three elements affect the viewer's perception of colour. If the
light source and the observer do not change, the object determines the observer's
perception of colour. The reason why an object can influence the final colour perception
is that the reflection spectrum (transmission spectrum) of the object changes the
spectrum of the light source. Different objects have different reflection spectra
(transmission spectra). (Spectrum) modulation to obtain different results because the
observer does not change, so it presents different colours, the principle is shown in the
figure below.
15.2
Colour difference formula
CIE 1976 ΔE*ab
∆E^* ab=[(∆L*)^2+(∆ a*)^2+(∆b*)^2 ] 1⁄2
ΔL^*=L_1^*-L_0^*
Δa^*=a_1^*-a_0^*
Δb^*=b_1^*-b_0^*
34 | en
JCS-BA-e-2410
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