Image processing apparatus, image processing method, and program

An image processing method to be executed in an image processing apparatus, the method comprising:

• determining an output value with respect to an input signal value of an input image;
• setting a reference point P to be in an input signal position in which an output luminance of the input image is less than or equal to a highest allowable luminance of a display unit, in a case where a maximum output luminance of the input image is greater than or equal to the highest allowable luminance of the display unit;
• calculating an adjusted luminance for output by multiplying a gain set to be greater than or equal to 1 for each input signal value in an input signal range in which the input signal value is less than or equal to the reference point P, and to be less than or equal to 1 for each input signal value in an input signal range in which the input signal value is greater than or equal to the reference point P, and an output value calculated according to an input/output transfer function corresponding to the input image, together;
• and
• generating a display image having the calculated adjusted luminance for output.

A non-transitory computer-readable medium having embodied thereon a program, which when executed by a computer causes the computer to execute a method, the method comprising:

• determining an output value with respect to an input signal value of an input image;
• setting a reference point P to be in an input signal position in which an output luminance of the input image is less than or equal to a highest allowable luminance of a display unit, in a case where a maximum output luminance of the input image is greater than or equal to the highest allowable luminance of the display unit;
• and
• calculating an adjusted luminance for output by multiplying a gain set to be greater than or equal to 1 for each input signal value in an input signal range in which the input signal value is less than or equal to the reference point P, and to be less than or equal to 1 for each input signal value in an input signal range in which the input signal value is greater than or equal to the reference point P, and an output value calculated according to an input/output transfer function corresponding to the input image, together;
• and
• generating a display image having the calculated adjusted luminance for output.