FIELD: TV engineering. SUBSTANCE: image signal is formed and its polarity is changed regularly in synchronism with frequency of line sweep. Then the signal is transformed non-linearly. Processed signal is used for reproduction of modulation of image brightness reproduced. Condition signal of selected area of dynamic range is formed and added with initial image signal. Moreover, this signal is subjected to contrast conversion till achieving its polarity. Device has image signal source 1, analog-to-digital converter 2, adder 3, amplitude characteristic former 4, controlled inverter 5, digital-to-analog converter 6, gamma-corrector 7, videocontrol unit 8, condition former 9, the first and the second flip-flops 10 and 11, EXCLUSIVE-OR gate 12. EFFECT: improved efficiency. 2 cl, 2 cl, 2 dwg
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