# Inspect Watch Dials

Watch dials and many other printed components demand high quality. Therefore, often pad printing (or tampography) is used, which, however, provides inspection challenges. If multiple pads are used, the alignment is often imperfect. The amount of ink applied changes such that the thickness of the lines may vary. While all this is not disturbing to the eye, it needs to be accepted. However, real defects like missing ink, spills or problems on the substrate need to be detected.

The images for this tutorial show watch dials at random orientations. You first need to use a Blue Locate Tool to determine the center and orientation of the dial. The resulting cropped and reoriented images can then be analyzed by a Red Analyze Tool. Since the dial also has holes which allow the presentation grid underneath it to be seen, you need to use a mask to prevent the Red Analyze tool from inspecting those areas.

###### Learning Objectives

- Use the Blue Locate tool to localize and correct the orientation of the dial.
- Attach a Red Analyze tool to perform the inspection.
- Add a mask to control which areas are inspected and which are not.