Abstract: A plurality of signal storage means are used to store, respectively, the peak signal value of the red, blue and green video signals of a color television camera for comparison against a predetermined signal level representing a desired combined signal condition, such as black. The peak values of the stored video signals are combined to ascertain the difference in peak signal amplitude between the red and green signals and the blue and green signals. Control signals developed from the difference signals adjust the respective red and blue channel signal levels so as to match the red and blue signal level to the green signal level to yield the desired combined signal condition.

Abstract: A gamma circuit for developing a video output signal having a positive gamma coefficient from an input signal having a negative gamma coefficient includes a multiplier and amplifier which forms an electronic divider. Adjustable reference sources provide a means for varying the gamma of the circuit to correct an input signal gamma of -.35 to -1 to a positive gamma.

Abstract: Negative color film is processed in a color telecine camera by the selection of an optical filter which provides equal light transmission for the red and green colors so as to produce equal red and green video signals. The electrical gain of the blue channel is then increased to produce a blue video signal equal to the red and green video signals.