Editing Opponent process (section)

{{short description|Theory regarding color vision in humans}}
{{for|the universal psychological and neurological model|opponent-process theory}}
{{Missing information|details of color perception|date=June 2022}}

The '''opponent process''' is a [[color theory]] that states that the human [[visual system]] interprets information about [[color]] by processing signals from [[photoreceptor cell]]s in an antagonistic manner. The opponent-process theory suggests that there are three '''opponent channels''', each comprising an opposing color pair: [[red]] versus [[green]], [[blue]] versus [[yellow]], and [[black]] versus [[white]] ([[luminance]]).<ref>{{cite book | title = A Text-book of physiology | author = Michael Foster | publisher = Lea Bros. & Co | year = 1891 | page = [https://archive.org/details/bub_gb_Swn8ztLFTdkC/page/n905 921] | url = https://archive.org/details/bub_gb_Swn8ztLFTdkC }}</ref> The theory was first proposed in 1892 by the German physiologist [[Ewald Hering]].