The thesis deals with the issue of the color change of wood after selected processes. The theoretical part explains the issue of color measurement. Basic concepts from the field of optics, expression using color models, wood composition and methods for color measurement are explained. In the practical part, we compare the color coordinates in the following color systems: CIE L*a*b*, CIE XYZ and RGB. Coordinates XYZ and RGB have been recalculated from the L*a*b* coordinate coordinates using formulas. The measurements were made using a colorimeter.