Colour Accuracy and Gamma

Colour accuracy is determined by displaying a series of different test colours and comparing the displayed value (as measured by the colorimeter) to the expected, ideal value. A complicated formula then outputs what is known as a delta E value, which in simple terms represents how far the displayed colour is from the ideal relative to how the human eye perceives it. Lower values are preferred, since that means the distance is less.

Gamma, meanwhile, refers to how a monitor deals with and corrects for the non-linear relationship between the amount of voltage applied to a pixel and the amount of light emitted. As such, it mainly affects the output of mid-range and greyscale colours. We are looking for a value of 2.2, which is in line with the standard sRGB colour space.