Image pickup apparatus, imaging system, control method, and storage medium

An imaging system comprising:

• an illumination apparatus;
• and
• an image pickup apparatus communicating with the illumination apparatus,
• wherein the image pickup apparatus includes:
• an image sensor configured to acquire a first raw image in each of a first state under illumination by the illumination apparatus and a second state under no illumination by the illumination apparatus;
• one or more memories storing instructions;
• and
• one or more processors that, upon execution of the instructions, operate to:
• generate a second raw image by removing information on an imaging condition from the first raw image,
• perform combination processing using the second raw image, and
• generate a third raw image by adding the information to the second raw image that has received the combination processing.

A control method for an image pickup apparatus communicable with an illumination apparatus, the control method comprising:

• acquiring, using an image sensor, a first raw image in each of a first state under illumination by the illumination apparatus and a second state under no illumination by the illumination apparatus;
• generating a second raw image by removing information on an imaging condition from the first raw image,
• performing combination processing using the second raw image, and
• generating a third raw image by adding the information to the second raw image that has received the combination processing.