Cone Cells: Cone cells are photoreceptor cells in the retina that are responsible for color vision.
Trichromatic Theory:The trichromatic theory explains how humans perceive color by using three types of cone cells that are sensitive to different wavelengths.
Opponent Process Theory:The opponent process theory suggests that we perceive color through opposing pairs of color channels (red-green, blue-yellow, black-white) which work in opposition to one another.