The authors propose a method for the elimination of dust particles from analysis of geometry of potato starch granules. The form and size differences between potato starch granules and dust particles permitted the application of suitable filters. The effectiveness of the method was verified through comparisons of particle size distributions of potato starch granules without dust particles and with deposited dust particles after the application of the algorithm/filter. At the same time, determination was made of the dynamics of dust deposition in the laboratory (ca. 450 particles cm-2 h-1).