The influence of the particles shape of crushed and floated talc for different size fractions on the whiteness index (parameter Y) was quantified by the fractal dimensions D-f of the contour roughness and D-g of the size distribution. Contours were obtained by an image analysis method and the fractal dimension D-f was calculated by the Richardson-Mandelbrot method. Frequency distributions of D-f for the talc particles < 20 mu m show higher values of D-f (between 1.25 and 1.35) after wet grinding in a ball mill with ceramic grinding media (Y = 85-86%) than after dry grinding with hammer mill Forplex (Y = 88.5%). This can be related to an increase of the number of particles with complex morphology that could influence the light distribution during the whiteness measurements. An increase in D-g values can be related to the presence of greater number of fine particles that could influence the quality of floated concentrates and then correlatively the whiteness of this concentrate.