A color photographing device is equipped with a light-receiving section
having a red pixel selectively receiving red light and outputting a red
pixel signal and a green pixel selectively receiving green light and
outputting a green pixel signal. The color photographing device is
further equipped with an optical filter disposed on the side with a
light-receiving surface of the light-receiving section. The optical
filter substantially equalizes the signal level of the red pixel signal
and the signal level of the green pixel signal when achromatic color
illuminated by a solar light source in the daytime is photographed.
Therefore, a white balance gain Wr at about 5000K can be lowered as
compared with a conventional color photographing device. Accordingly,
reduction of color noises and enhancement of gradation can be expected.