Endoscope system for controlling an amount of illumination light

An endoscope system comprising:

• a light source unit that emits first illumination light and second illumination light having an emission spectrum different from an emission spectrum of the first illumination light;
• a first processor;
• and
• a second processor,
• wherein, in a case where the first processor performs control to automatically switch and emit the first illumination light and the second illumination light, each of a light emission period K(N) in which the first illumination light is emitted and a light emission period L(N) in which the second illumination light is emitted is a light emission period of at least one or more frames,
• the second processor acquires a first image signal group that includes first image signals obtained through image pickup of a subject illuminated with the first illumination light in the light emission period K(N) of the first illumination light and a second image signal group that includes second image signals obtained through image pickup of the subject illuminated with the second illumination light in the light emission period L(N) of the second illumination light, calculates a first brightness D1 of the subject from the first image signals and calculates a second brightness D2 of the subject from the second image signals, sets an amount of the first illumination light or the second illumination light on a basis of the first brightness or the second brightness, and performs at least one of adjustment of the amount of the second illumination light that is set at a first switching timing at which illumination light is switched to the second illumination light from the first illumination light or adjustment of the amount of the first illumination light that is set at a second switching timing at which illumination light is switched to the first illumination light from the second illumination light, and
• the second processor performs at least one of adjustment of an amount of the second illumination light, which is set at a first switching timing T1 of the light emission period L(N), using information about a first switching timing T1 of a light emission period L(N−2) before the light emission period L(N) or adjustment of an amount of the first illumination light, which is set at a second switching timing T2 of the light emission period K(N), using information about a second switching timing T2 of a light emission period K(N−2) before the light emission period K(N).