The Image Analyzer - A True Dot Area Meter?

Measuring halftone dot areas on aluminum printing plates with a video image analyzer is a simple procedure but tends to be rather subjective. The major variables in such a system are image capture, aperture selection and thresholding. Some of the theoretical and practical considerations surrounding these variables are discussed and some proposals are made regarding procedure. It is shown that a very simple method of measurement can be both accurate and fairly insensitive to user subjectivity.