Review Paper: The Helmholtz-Kohlrausch effect.

The article presents the author's view on the Helmholtz-Kohlraushch (H-K) effect which is described as the influence of color purity on the perceived brightness of a color object or source. It discusses different studies from 1825 to the present on color and brightness perception and disabling glare. It shows how the H-K effect works on displays, mobile devices and phones, including perception at mesopic light levels which happened during night driving.