Abstract: The system combines first and second composite video signals into a resulting composite video signal. The first composite video signal represents a foreground scene having a first trichromatic moving picture region which envelopes a second trichromatic backing region through a trichromatic transition region. The second composite video signal represents a background scene. A gain controlling circuit produces from first component video signals first and second analog signals (1-.alpha.), (.alpha.) which control in proportion the amplifications of the first and second composite video signals to obtain second output composite video signals. The first analog signal has first and second levels when the first component video signals are representative of the first and second picture regions and has intermediate levels lying between the first and second levels when the first component video signals are representative of the transition region.

Abstract: A video titling device for color television pictures wherein the color transmission system is of the SECAM, NTSC or PAL types in which the luninance signal and chrominance signal making up the composite video signal are separate signals. A part of the luminance signal spectrum Y is extracted from the input video signal having a chrominance subcarrier S.P. carried through a single filtering step without modifying the composite input signal. Thus from the composite input video signal of luminance signal Y and chrominance signal S.P. (Y + S.P.) through a single filter, the subtraction of the amplitude of a direct predetermined luminance signal K from the amplitude of luminance signal Y provides a (Y-K) signal. This Y-K signal is then cut out by switching means at a reference voltage under the control of a switching signal representing those selected pictures for the titling operation, and the aforesaid cut out signal is then subtracted from the input video signal (Y + S.P.).