This master's thesis analyzes the influence of Gray Component Replacement (GCR) method on print quality. By mixing equal amounts of CMY inks colors in printing or prints do not result with ideal black color, but dark brown. Therefore, in the printing process the fourth, black ink is added. This flaw of the subtractive synthesis, and the presence of fourth K ink opens up the possibility of replacing a certain percentage of mixed „black“ with pure black . So, it is a method that replaces a certain share of CMY with some portion of black (K) to create the exact experience of color with smaller amount of colorful inks. There are some particular problems in this process which are explained in the thesis. The experimental part of this thesis describes the conducted research which aimed to determine the impact of GCR method on print quality and the proportion of GCR replacement yielding acceptable results in the observed process. The hypotheses that the colorimetric color deviations between samples before and after applied GCR can be reduced by the use of accurate models in the colorimetric density domain which consequently leads to noise reduction in reproduced images.