Control device

A control device comprising:

• one or more processors comprising hardware, the one or more processors being configured to:
• generate a white light image based on a first image signal captured as a result of irradiating a subject with a white light;
• generate a first narrow-band light image based on a second image signal captured as a result of irradiating the subject with a first narrow-band light;
• generate a second narrow-band light image based on a third image signal captured as a result of irradiating the subject with a second narrow-band light,
• control a light intensity of the white light to a first value which is determined according to brightness of the white light image and according to a first ratio, wherein:
• when brightness of the first narrow-band light image is equal to or greater than a threshold value, the one or more processors being configured to control a light intensity of the first narrow-band light to be equal to a first predetermined light intensity, and
• when brightness of the second narrow-band light image is equal to or greater than a threshold value, the one or more processors being configured to control a light intensity of the second narrow-band light to be equal to a second predetermined light intensity.