Within the print industry, flexographic print is the fastest growing field. The quality of print produced by this technique is constantly increasing. During the production process, the size of raster element is changed which can result in tone and colour fluctuations, which is greatly influenced by the production technology of photopolimer flexographic printing forms. Thus the reproduction range of lighter tones is broadened. However there is a limit in reproduction of lighter tones. One of the key parameters in insuring print quality is defining the growth of screen value. This research is based on screen value growth between lighter and darker tones. The primary goal of this research is defining the screen value growth which is the result of the print process between lighter and darer tones, and possibility of lighter tone reproduction in flexographic print. The secondary goal is to explore the CIELab values of full tone. Using densitometry methods the screen value growth will be measured in fields of different colour density. All samples which have been used for testing ae obtained in real production. The results of testing will be compared with the values defined by ISO standard no. 12647-6:2006(E). given the results of testing, the limit value of screen value growth tone will be obtained regarding lighter and darker tones.