Early Results Of Image Area Measurements

Early results of image area measurements are reported. The measurements at precise locations in the image area became practical in June of 1985, with the availability of an automated densitometer with computer-controlled positioning anywhere on the sheet. Methods used to evaluate quality of images are discussed. Display of image area readings for press color control is also discussed. Examples show how automated image area measurements can give a clear evaluation of the quality of the printed product and how much more important it is to control that quality as it is produced on the press. The early results of image area measurements have demonstrated the ability to make meaningful comparisons of the match or mismatch between printed sheets and proofs or OK sheets using simple density differences. The key requirement is that the measurements be made at precisely equivalent locations so that measurements are comparable.