An endoscope system is provided with a light source unit for generating illumination light, an image sensor for imaging an object of interest irradiated with the illumination light, an image signal obtaining section, and a calculated image signal generator. The image signal obtaining section obtains a B1 image signal corresponding to violet light and a B2 image signal corresponding to blue light that differs in scattering coefficient of the object of interest from the violet light and that has the same absorption coefficient as the violet light. The calculated image signal generator generates a calculated image signal from the B1 and B2 image signals.
