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We made theoretical approaches concerning?the optical property of a pigment-containing system to?understand the conditions under which an enhanced contrast?can be achieved. Maintaining a uniform distribution?of pigment particles in thin film well, as in millbase dispersion,is considered critical for a higher contrast. As a?specific case, we estimated the effect of a polymeric binder?on the contrast ratio. Chemical composition of the dispersion?binder has a huge effect, and carboxylate in its long?side chain plays a favorable role. Using this binder, we?were able to obtain a smooth surface and uniformity, and?an enhancement of contrast ratio in the colorant film.