Enzymatic treatment application in textiles preparing processes extends due to the offer of new enzyme products, improvement of processing results and ecology of technologies. Enzymes are high molecular protein biocatalysts specific in their action. In presented research, cellulase and pectinase enzymes are used for preparing raw linen fabric with emphasis on colour characteristic changes. Colour coordinates of experimental samples have been evaluated in RGB system. As well the whiteness of the linen fabric was measured. Determinated coordinates of colour vector in a colour space a*, b* and L* and calculated lightness difference (ΔL*), common colour differences (ΔE), colour saturation (C), hue (H) shove that enzyme type and modification method have influence on raw linen colour parameters and whiteness is insignificant. If the higher whiteness as 29 % is required, the additional chemical bleaching is necessary.