Distinctness Of Image (DOI) Gloss

Terminlogy

DOI - aspect of gloss characterized by the sharpness of images of objects produced by reflection at a surface. (ASTM E 284)

Decreasing DOI

In general, as DOI decreases, reflections at the sample surface appear to spread or fuss. This can readily be seen along the reflection's perimeter. The Surface Analysis System's DOI algorithm measures this spreading phenomena.

DOI Measurement

An area is determined from each of the image reflections. A circle is created that has the same area for each of the two images and is drawn above/right. The difference between the Reference radius and the Sample radius represents the DOI loss.

Reference to Sample DOI measurement