Deer have dichromatic (two-color) vision with blue and yellow primaries; humans normally have trichromatic vision. Males, therefore, can only be dichromatic, while females can be either dichromatic or trichromatic. Like trichromatic cameras, multispectral and hyperspectral cameras collect data from the electromagnetic spectrum. RGB or trichromatic white LEDs use multiple LED chips emitting red, green, and blue wavelengths. Unlike other New World monkeys, both male and female howler monkeys have trichromatic color vision. Both the trichromatic and opponent process color theories explain chimerical colors. Their results laid the foundation for the trichromatic CIE XYZ color space specification. Subsequently, in 1916, the technicolor technique arrived (trichromatic procedure (green, red, blue). Two complementary theories of color vision are the trichromatic theory and the opponent process theory. Thus trichromatic color vision is accomplished by using combinations of cell responses. In September researchers were able to give trichromatic vision to squirrel monkeys. These bees also have trichromatic color vision and are important pollinators in agriculture. This research suggests the species has trichromatic vision, like humans. Physiological evidence for trichromatic theory was later given by Gunnar Svaetichin (1956). The Trichromatic theory was proposed in 1802 by Thomas Young.