Ans. One of the main disadvantage is chromatic aberrasion. A more likely cost of trichromacy arises when an image is sampled by receptors with differing spectral sensivities because it is not possible to separate luminanance information. Solution Ans. One of the main disadvantage is chromatic aberrasion. A more likely cost of trichromacy arises when an image is sampled by receptors with differing spectral sensivities because it is not possible to separate luminanance information..