Image processing apparatus for improving image sharpness according to the output condition, image processing method and program

An image processing method, comprising:

• acquiring an output condition when an image forming apparatus forms an image on a recording medium based on image data, and performing image processing on the image data for improving sharpness of the image by using a parameter based on the output condition,
• wherein the parameter represents such a characteristic that the image formed by the image forming apparatus has a luminous characteristic in relation to a spatial frequency that remains constant or decreases continuously without causing any inflection point or any discontinuous point in a frequency band from a predetermined frequency to a limit frequency of the image forming apparatus.

An image processing method, comprising:

• acquiring an output condition when an image forming apparatus forms an image on a recording medium based on image data, and performing image processing on the image data for improving sharpness of the image by using a parameter based on the output condition,
• wherein the parameter represents such a characteristic that the degree of improvement in sharpness is enhanced in a specific frequency range lower than a predetermined frequency, in spatial frequencies of the formed image, in which contribution to visibility is sufficiently small, and that the degree of improvement in the sharpness remains constant or decreases continuously without causing any inflection point or any discontinuous point in a frequency band higher than the predetermined frequency and reaching a limit frequency of the image forming apparatus.

A computer-readable non-transitory recording medium storing a program that causes a computer to perform image processing method, the method comprising:

• acquiring an output condition when an image forming apparatus forms an image on a recording medium based on image data, and performing image processing on the image data for improving sharpness of the image by using a parameter based on the output condition for improving sharpness of the image,
• wherein the parameter represents such a characteristic that a degree of improvement in sharpness is enhanced in a specific frequency range lower than a predetermined frequency, in spatial frequencies of the formed image, in which contribution to visibility is sufficiently small, and that the degree of improvement in the sharpness remains constant or decreases continuously without causing any inflection point or any discontinuous point in a frequency band higher than the predetermined frequency and reaching a limit frequency of the image forming apparatus.