Image processing device and image processing method

An image processing device connected to an imaging unit and a display unit, the imaging unit including an imaging element partitioned into a plurality of pixels and having an exposure condition changeable, the image processing unit comprising:

• an acquiring unit for acquiring a plurality of image data by causing the imaging unit to photograph a photographing range plurality of times under different exposure conditions;
• a calculation unit for calculating a luminance distribution corresponding to a distribution of a light energy entering the imaging element based on the plurality of image data and the exposure condition corresponding to each of the image data;
• a conversion unit for converting the luminance distribution to a distribution of a tone value in a default numerical range to be displayed on the display unit, the conversion unit performing the conversion by relating a luminance value within a first range to be corresponded to the tone value;
• and
• an updating unit for updating the first range in the correspondence relationship based on the light energy entering the imaging element.