What is Color?

What is measurement geometry?

The perceived color of a sample is also dependent on the angle of the incident light on the sample and on the angle from which the sample is observed. This must also be taken into account and defined in the measurement techniques and in the spectrophotometers used. We talk of the measurement geometry used in the spectrophotometer.

In lighting, a distinction is made chiefly between diffuse lighting (d) produced by a flash lamp illuminating an integrating sphere and lighting directed at a specific

Angle (0° or 45°).

The reflection is always measured at a specific angle of observation -

0°, 8° or 45°. Various measurement geometries have been developed for different applications. In the paper industry, a d/0° measurement geometry is used, whereas in the textile and plastics industry, d/8° is used. The graphic arts industry prefers 0/45° or 45/0°.