Image exposure device, image exposure method, and program

An image exposure method in an image exposure device including an image display device that has a plurality of pixels and radiates light according to a display image represented by the plurality of pixels, a support portion that supports a photosensitive recording medium for recording a recorded image according to the display image in a state in which an exposure surface of the photosensitive recording medium faces the image display device, and a limiting member that is provided between the image display device and the support portion, and limits an angle of the light radiated from the image display device to the photosensitive recording medium, the method comprising:

• controlling the image display device to perform a digital image processing on pixels of the display image to deteriorate an image quality of an input image represented by input image data by emphasizing a density difference of a high-frequency component of the input image,
• wherein the density difference of the high-frequency component is emphasized by unsharp mask processing, and
• wherein in a case where y represents a weight of the unsharp mask processing and x represents a standard deviation of a degree of a two-dimensional Gaussian distribution used for the unsharp mask processing, the following expression (1) is satisfied,
• −0.1×x+0.40<y<−0.1×x+0.90 (1).

A non-transitory computer readable medium for storing a program for causing a computer to execute a process, the computer controlling an image exposure device including an image display device that has a plurality of pixels and radiates light according to a display image represented by the plurality of pixels, a support portion that supports a photosensitive recording medium for recording a recorded image according to the display image in a state in which an exposure surface of the photosensitive recording medium faces the image display device, and a limiting member that is provided between the image display device and the support portion, and limits an angle of the light radiated from the image display device to the photosensitive recording medium, the process comprising:

• controlling the image display device to perform a digital image processing on pixels of the display image to deteriorate an image quality of an input image represented by input image data by emphasizing a density difference of a high-frequency component of the input image,
• wherein the density difference of the high-frequency component is emphasized by unsharp mask processing, and
• wherein in a case where y represents a weight of the unsharp mask processing and x represents a standard deviation of a degree of a two-dimensional Gaussian distribution used for the unsharp mask processing, the following expression (1) is satisfied,
• −0.1×x+0.40<y<−0.1×x+0.90 (1)