The paper presents some of the results, obtained during the research on scientific project at TU-Sofia № 171ПР0012-06 “Research on the influence of using raster image processors (RIP) on the quality of color printing of digital proofing systems“. The purpose of the paper is to present a research on the quality of color printing of and toner based printer using custom generated ICC profiles. Before the current research, the printer is properly adjusted, calibrated and linearized according to the method published in previous research of the author. The generated profiles are then thoroughly tested and analyzed using specialized software. Their color gamut is compared to the standard offset gamut. The color rendering of the profiles is evaluated through testing and a general conclusion of the benefits of the process is provided.