Metamerism-Index - Techkon SpectroDens Manual

Manual TECHKON SpectroDens

Metamerism-Index

Metamerism is the visual phenomenon that two colors match under certain light con-
ditions and differ under different light conditions.
Colorimetry offers the possibility to detect this effect by measuring the color distance
between the two color samples under two exactly defined light sources. The result of
this operation is the Metamerism-Index.
Identical color impression under light condition 1:
Color deviation under light condition 2
caused by metamerism:
68
For the determination of the Metamerism-In-
dex there are two measurements to be made.
1. A reference measurement, which refers to
illuminant condition D65.
2. A sample measurement on the sample
patch.
As a result the color distances in ∆E* a*b* for
illuminant conditions A, C and D50 are shown.