Today quality of graphic products is allocated to a much more important place in a graphic production process, because the quality is one of the factors the reputation of printing house and her competitiveness on the market depend on. Large printing houses mostly print great number of editions, have a remarkable reputation and cover a wide band on the market. Otherwise, small printing houses, which print small number of editions, must fight for the subsistence. Therefore, the quality of prints is one of the key factors of competitive elements of their products. In Croatia the quality control is carried out only in few large printing houses, while in the small printing houses the quality is not enough high and it often varies, but in the most cases the control is not carried out at all. The researches in this paper are referred to the quality control. The prints that were used are made in a small number of editions, with the offset print technology, on the one-color machine and in the relatively small printing house. Dot gain, relative printing contrast, greyness and hue error measurings were done spectrophotometrically.