Recently, the number of high-performance electrophotographic machines with a speed of more than 120 ppm A4 format has increased on the market of printing machines. This is made possible by improving the basic components in the electrophotographic printing unit (photoreceptors, developer rollers and toner cartridges for the machines. There has also been a change in the type of toner powder, which uses less energy and has new developer particles. The aim of this paper is to examine the quality of a high-performance Konica Minolta Accuriopress C12000 electrophotographic machine with a print speed of 120 ppm A4 color pages and to determine how a change in screening at 100, 190, 270 lpi affects the realization of CMYK color prints. This was made possible using RIP Fiery IC-318. The printing substrate used in the experiment was standard Splendorgel offset paper with a grammage of 160 g / m2, and therefore the Fogra 52 (Ugra/Fogra Media Wedge of 74 fields) was taken as a reference. The obtained CMYK prints was analyzed using the colorimetric method (X-Rite eXact Advanced) with the determination of color changes of CIELAB, ΔE, ΔL, ΔC caused by mutual comparison. The uniformity of the printed edition will be additionally examined, and the test interval of 60 seconds will be monitored in detail (1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55 and 60 prints). Origin Pro 8.5 was used to graphically display the results The results show that the color oscillations are lowest when printed with an FM raster and with 190 lpi AM raster screening. The most inferior results are visible with a 100 lpi raster screening. Oscillations over a period of 60 seconds are significantly higher in the second test interval ie,, l from 35 to 60 seconds in the primary run.