An image processing device and an image processing program

An image processing process comprising:

• acquiring a saturation value of a target pixel or a saturation value of a target small area including a target pixel and peripheral pixels around the target pixel, and
• correcting the target pixel so that a corrected gradation characteristic obtained by correcting the target pixel matches a gradation characteristic synthesized by mixing a color gradation characteristic and a monochrome gradation characteristic at a predetermined mixing ratio based on the saturation value, wherein
• assuming that the saturation value is c, and the mixing ratio of the color gradation characteristic is W, a value of W is represented by variable c as a relationship W=f(c) and satisfies a following condition:
• There is a saturation value c and a multiplier a which satisfy f(c)>αg(c), and α>1, wherein a relationship in which the mixing ratio W increases in proportion to the saturation value c is W=g(c) and the saturation value is equal to or greater than a threshold value.

A non-transitory computer-readable storage medium storing a program for causing a computer to perform an image processing process comprising:

• acquiring a saturation value of a target pixel or a saturation value of a target small area including a target pixel and peripheral pixels around the target pixel, and
• correcting the target pixel so that a corrected gradation characteristic obtained by correcting the target pixel matches a gradation characteristic synthesized by mixing a color gradation characteristic and a monochrome gradation characteristic at a predetermined mixing ratio based on the saturation value, wherein
• assuming that the saturation value is c, and the mixing ratio of the color gradation characteristic is W, a value of W is represented by variable c as a relationship W=f(c) and satisfies a following condition:
• There is a saturation value c and a multiplier a which satisfy f(c)>αg(c), and α>1, wherein a relationship in which the mixing ratio W increases in proportion to the saturation value c is W=g(c) and the saturation value is equal to or greater than a threshold value.