means for converting an optical image into an electrical picture signal a luminance signal processing circuit 4 for processing a luminance signal y a television signal encoder 5 a color separation circuit 6 for separating a red signal r and a blue signal b gain varying amplifiers 7 and 8 operating as gain control means for varying and controlling gains of the signals r and b respectively color signal processing circuits 9 and 10 for processing the signals r and b respectively subtracter circuits 11 and 12 for forming a difference signal r y of the signals r and y and a difference signal b y of the signals b and y respectively balanced modulators 13 and 14 for balance modulating the signals r y and b y respectively an adder circuit 15 averaging circuits 16 and 17 for detecting mean values of the signals r y and b y respectively comparators 18 and 19 operating as distinction means for comparing the mean values of the signals r y and b y with a reference zero level respectively up down counters 20 and 21 d a converters 22 and 23 for generating voltages to vary the gains of the signals r and b respectively an automatic white balance setting switch 24 a picture signal output terminal 25 a voltage compensation circuit 34 operating as compensation means a color temperature detecting circuit 100.