Image processing apparatus and method, and image processing program

An image processing method comprising the steps of:

• accepting input of applied image data;
• determining whether a pixel of interest in the image data exhibits color bleed;
• discriminating, in a case where it has been determined that the pixel of interest exhibits color bleed, a direction in which luminance is monotonically decreasing, using the pixel of interest as a starting point, in the neighborhood of the pixel of interest;
• finding a pixel, at which the monotonic decrease in luminance ends, in the discriminated direction in which luminance is monotonically decreasing;
• deciding upon the found luminance monotonic decrease end pixel as a target pixel;
• calculating a correction value that corrects color of the pixel of interest to the color of the target pixel decided;
• correcting the color of the pixel of interest using the color correction value calculated;
• and
• calculating, in a case where a plurality of directions of luminance monotonic decrease have been discriminated by said luminance monotonic decrease direction discriminating step, distances between the pixel of interest and a plurality of luminance monotonic decrease end pixels found in every direction of luminance monotonic decrease by said luminance monotonic decrease end pixel finding step;
• wherein said target pixel deciding step decides, in accordance with the distances calculated by said distance calculating step, that a luminance monotonic decrease end pixel closest to the pixel of interest is the target pixel from among the plurality of luminance monotonic decrease end pixels found by said luminance monotonic decrease end pixel finding step.

A non-transitory recording medium on which has been recorded a program for causing a computer to:

• accept input of applied image data;
• determine whether a pixel of interest in the image data exhibits color bleed;
• discriminate, in a case where it has been determined that the pixel of interest exhibits color bleed, a direction in which luminance is monotonically decreasing, using the pixel of interest as a starting point, in the neighborhood of the pixel of interest;
• find a pixel, at which the monotonic decrease in luminance ends, in the discriminated direction in which luminance is monotonically decreasing;
• decide upon the found luminance monotonic decrease end pixel as a target pixel;
• calculate a correction value that corrects color of the pixel of interest to the color of the target pixel decided;
• correct the color of the pixel of interest using the color correction value calculated;
• and
• calculate in a case where a plurality of directions of luminance monotonic decrease have been discriminated by said luminance monotonic decrease direction discriminating step, distances between the pixel of interest and a plurality of luminance monotonic decrease end pixels found in every direction of luminance monotonic decrease by said luminance monotonic decrease end pixel finding step;
• wherein said target pixel deciding step decides, in accordance with the distances calculated by said distance calculating step, that a luminance monotonic decrease end pixel closest to the pixel of interest is the target pixel from among the plurality of luminance monotonic decrease end pixels found by said luminance monotonic decrease end pixel finding step.