1. A procedure for judging the quality of printed images printed on a printing carrier, by means of an opto-electronic exposure device and a reference information storing device for memorizing image information in high contrast image elements of a printed image, characterized in that a printed image is divided into a multitude of image elements of a size to be chosen, and that to each of these individual image elements is coordinated an individual, reference grey value within an envelope of image locations, and an individual, allowable reference ink density value variation to provide an allowable grey value tolerance in each image element.