J. Schanda

On the use of the sRGB colour space: the 'Gamma' problem

Abstract The dependence of the luminous output of computer-controlled CRT monitors on the digital colour values was measured on 11 different monitors. This dependence was called the channel function. Different settings of the monitors (gain/offset, position and size of the test colour patch, screen size) were investigated. It was concluded that the use of the default sRGB channel function instead of the measured channel function can lead to mean chromaticity errors of up to Δ u ′ v ′=0.06 and colour differences of up to Δ E ab ∗ =33. Changing the graphics card did not influence the channel functions significantly.