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Summary:
As graphic reproduction technology becomes more objective, and progresses from craft to engineering disciplines, the need for objective measurement also grows. This paper discusses instrumentation and its application in our industry -- both in the laboratory and on the production line. Some light will be shed on the question of Wideband versus Narrowband, as well as how to use colorimetric data in a context heretofore reserved for densitometry. The advantages of spectrophotometry are also discussed. The paper also discusses a laboratory application of spectrophotometry. Spectrophotometry is used to assess the precision of several models used to compute photometric halftone dot area. The Yule-Nielsen model was sufficiently precise, while other models experimentally tested were not.