GMNA GM9101P PDF

This procedure provides an instrumental method for evaluating the Distinctness of Image (DOI) of automotive paint film surfaces. Testing Laboratory.

Evaluation of appearance involves the projection of various size images onto a painted surface. The image forming patterns (Landolt rings) as shown in Figure 1 are projected from a fluorescent lighted box at a specified distance of 100 mm over the sample under examination. By assigning a 3 PROCEDURE. value of 100 to the smallest set of rings and a value of 90, 80, 70, etc, to the next uniformly increasingly larger rings, a rating scale is obtained which can be used to quantitatively evaluate the DO1 of the painted surface.

Due to differences which exist in visual acuity between different operators, it is essential that a control standard and value normalization always be used to standardize the readings