Image processing apparatus, imaging apparatus, image processing method, and image processing program

An image processing method comprising:

• a step of obtaining a first color signal, a second color signal, and a third color signal of three primary colors indicating a captured image;
• a step of generating a first brightness signal using the obtained first color signal, second color signal, and third color signal, and first coefficients including first coefficient correspond to the first color signal, first coefficient correspond to the second color signal, and first coefficient correspond to the third color signal, which are for generating the reference first brightness signal;
• a step of generating a second brightness signal using the obtained first color signal, second color signal, and third color signal, and second coefficients including second coefficient correspond to the first color signal, second coefficient correspond to the second color signal, and second coefficient correspond to the third color signal, which are obtained by decreasing a weight of a coefficient corresponding to a chromatic target color in the first coefficients;
• and
• a step of generating a third brightness signal in which a brightness of the chromatic target color is controlled based on the generated first brightness signal and second brightness signal.

A non-transitory computer readable medium for storing an image processing program causing a computer to execute:

• a function of obtaining a first color signal, a second color signal, and a third color signal of three primary colors indicating a captured image;
• a function of generating a first brightness signal using the obtained first color signal, second color signal, and third color signal, and first coefficients including first coefficient correspond to the first color signal, first coefficient correspond to the second color signal, and first coefficient correspond to the third color signal, which are for generating the reference first brightness signal;
• a function of generating a second brightness signal using the obtained first color signal, second color signal, and third color signal, and second coefficients including second coefficient correspond to the first color signal, second coefficient correspond to the second color signal, and second coefficient correspond to the third color signal, which are obtained by decreasing a weight of a coefficient corresponding to a chromatic target color in the first coefficients;
• and
• a function of generating a third brightness signal in which a brightness of the chromatic target color is controlled based on the generated first brightness signal and second brightness signal.