Image processing apparatus, control method, and non-transitory computer-readable storage medium

A control method of an image processing apparatus, the method comprising:

• dividing a first image into a plurality of areas based on obtained image data of the first image corresponding to a first brightness, and setting, for each of the plurality of areas, relationship information that associates an input brightness value with an output brightness value;
• specifying at least some pixels of the first image, wherein the at least some pixels belong to adjacent areas of the plurality of areas respectively;
• converting, based on the relationship information, a brightness value of a pixel included in the first image into a brightness value of a pixel of a second image which corresponds to a brightness range narrower than a brightness range to which the first image corresponds by determining a brightness value, for each of the at least some pixels, in the second image such that (a) a brightness value for one pixel of the at least some pixels is determined based on the relationship information set for respective areas to which each of the at least some pixels belongs and (b) a brightness value for another pixel of the at least some pixels is determined based on the relationship information set for the respective areas.

A non-transitory computer-readable storage medium that stores a computer program configured to cause a computer provided in an image processing apparatus to:

• divide a first image into a plurality of areas based on obtained image data of the first image corresponding to a first brightness, and set, for each of the plurality of areas, relationship information that associates an input brightness value with an output brightness value;
• specify at least some pixels of the first image, wherein the at least some pixels belong to adjacent areas of the plurality of areas respectively;
• convert, based on the relationship information, a brightness value of a pixel included in the first image into a brightness value of a pixel of a second image which corresponds to a brightness range narrower than a brightness range to which the first image corresponds by determining a brightness value, for each of the at least some pixels, in the second image such that (a) a brightness value for one pixel of the at least some pixels is determined based on the relationship information set for respective areas to which each of the at least some pixels belongs and (b) a brightness value for another pixel of the at least some pixels is determined based on the relationship information set for the respective areas.