A gamma correction circuit for a television receiver includes a low pass
filter for filtering a luminance signal gamma-corrected in a transmitter
side and outputting a low frequency zone component luminance signal, a
luminance signal corrector for compensating for a high frequency zone
component with regard to a color signal transmitted from the transmitter
side and the low frequency zone component luminance signal outputted from
the low pass filter, an operator for applying a subtraction and a division
with regard to the low frequency zone component luminance signal outputted
from the low pass filter and the corrected luminance signal, and a color
signal restoration unit for restoring a original color signal using the
color signal corrected in the corrector and the luminance signal outputted
from operator, for thereby being provided to a CPT (color picture tube).
The circuit decreases a picture quality degradation and a detail
aggravation in accordance with a gamma correction and a zone confinement
of a color signal in the transmitter side.