Discover magazine notes The Upside of Color Blindness:
Observations of capuchins foraging for surface-dwelling insects showed that color-blind capuchins made nearly 20 insect-capture attempts per hour, compared with only about 16 for those with normal color vision.One possible explanation for the color-blind advantage is that a reduction in color signals makes the differences in texture and brightness more apparent, so it’s easier to see past color camouflage, says Melin.
The image is of earth, with red-green color-blindness and without.