A digital color corrector for a color component of a video signal is operable to effect gamma, gain and black level correction. The gamma correction k is applied to a multiplier receiving the input signal E. Black level correction B is applied to an adder, and further arithmetic circuits are provided together with gain correction A to implement the equation.delta.E=[k.multidot.E+(A-B-k)].multidot.E+Bwhich includes a good approximation of the gamma correction without the need to use log and anti-log circuits. The output .delta.E represents an offset correction signal to be added to the original color component signal.