An image capturing apparatus detects an out-of-gamut region falling outside a predetermined color gamut in accordance with an image capturing condition or image generating parameter of a captured image. A monitor displays the detected out-of-gamut region along with the captured image from an imager to enable a user to easily select the color space most appropriate for the captured image at the time the image is captured. At the time the image is captured, the user selects the image capturing condition or image generating parameter most appropriate for the captured image in accordance with the color reproduction range of an output deice. From a recorded captured image, the user estimates the output result of the output device by displaying an out-of-gamut region in accordance with the image capturing condition or image generating parameter at the time the image is captured.