This endoscope system comprises: an image acquiring means for acquiring a color image having at least three color components； a placement means for placing points corresponding to respective pixels forming the color image in accordance with the color components of the points, within a plane including a first axis that is an axis of a first component among the at least three color components and a second axis that is an axis of a second component among the at least three color components and that intersects with the first axis； a distance data calculating means for calculating data regarding the distances between the points corresponding to respective pixels and a third axis defined as an axis that passes through a point at which the first axis and the second axis intersect with each other in the plane and that is not parallel to the first axis and the second axis； and an evaluation value calculating means for calculating a certain evaluation value for the color image on the basis of the calculated distance data.
