In its simplest form the opponent colour model of human colour vision includes an achromatic channel having V(λ) sensitivity, and two opponent colour channels. Perceived brightness is considered to be a sum of the total activity in these three channels. From fitting experimental data it is suggested that at suprathreshold levels the achromatic channel is suppressed, and that brightness can be modelled adequately by the two chromatic channels alone. This model is termed Chromatic Brightness.
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