 The gamma-encoded scale, which has a nonlinearly-increasing intensity, will show much more even steps in perceived brightness.A cathode ray tube (CRT), for example, converts a video signal to light in a nonlinear way, because the electron gun's intensity (brightness) as a function of applied video voltage is nonlinear.The light intensity "I" is related to the source voltage "V"s according to
where "γ" is the Greek letter gamma.