An endoscope apparatus picks up an image by a returning light from a subject illuminated by illumination means by a CCD equipped with a color filter, and when performing emphasis processing on sharpness by an emphasis processing circuit with respect to a luminance signal Y and a color difference signal R-Y, B-Y as an image signal generated through a Y/C separation circuit or the like, switches emphasis processing characteristics according to an observation mode and a type of the CCD, to reduce false color, color moiré.
