Information processing apparatus, image processing method, and storage medium that determine tone characteristics for respective object signals

An image processing method comprising:

• an acquisition step of acquiring an image having object regions;
• a detection step of detecting each object region from the image acquired in the acquisition step;
• a luminance distribution calculation step of calculating a plurality of luminance distribution information for respective object regions detected in the detection step;
• a representative luminance value calculation step of calculating a representative luminance value for each object region detected in the detection step;
• and
• a determination step of determining tone characteristics, which are used for tone compression, for respective object regions, based on a luminance distribution of the target object region and a difference between the representative luminance value of the target object region and the representative luminance value of the object region other than the target object region.

A non-transitory computer-readable recording medium recording a program for causing a computer to execute each step in an image processing method comprising:

• an acquisition step of acquiring an image having object regions;
• a detection step of detecting each object region from the image acquired in the acquisition step;
• a luminance distribution calculation step of calculating a plurality of luminance distribution information for respective object regions detected in the detection step;
• a representative luminance value calculation step of calculating a representative luminance value for each object region detected in the detection step;
• and
• a determination step of determining tone characteristics, which are used for tone compression, for respective object regions, based on a luminance distribution of the target object region and a difference between the representative luminance value of the target object region and the representative luminance value of the object region other than the target object region.