A pixel value is adjusted to satisfy an exposure condition using a ratio
(EV ratio) of exposure amounts of images taken without illumination light
and with illumination light. When the pixel value of one of two images is
modified, a subtraction process is performed on the pixel values of these
two images. By finding a difference between two images that satisfy the
exposure condition for pickup, the effect of a shadow or the like due to
an interior lamp can be eliminated. Finally, the subtraction result is
adjusted. As a result, an image processing apparatus, image pickup
apparatus, and image processing method can be provided capable of
eliminating the effect of a shadow or the like due to an outside light
caused to the taken image.
