Abstract: An image processing device includes: a separating unit configured to separate colors of a plurality of pixels included in an input color image into a plurality of color groups on the basis of similarities between the colors of the pixels; and a conversion unit configured to generate a monochrome image by performing correction on each of the pixels of the color image on the basis of a grayscale representation assigned to each of plurality of the color groups.

Abstract: An output apparatus determines pixels that form an area equal to or greater than a predetermined size and whose pixel values are not different from pixel values of neighboring pixels, and pixels that form an area not equal to or greater than the predetermined size. The apparatus reduces the pixel values of the determined pixels and outputs a binary image formed by the determined pixels with the reduced pixel values.

Abstract: An image processing device includes: a separating unit configured to separate colors of a plurality of pixels included in an input color image into a plurality of color groups on the basis of similarities between the colors of the pixels; and a conversion unit configured to generate a monochrome image by performing correction on each of the pixels of the color image on the basis of a grayscale representation assigned to each of plurality of the color groups.

Abstract: An output apparatus determines pixels that form an area equal to or greater than a predetermined size and whose pixel values are not different from pixel values of neighboring pixels, and pixels that form an area not equal to or greater than the predetermined size. The apparatus reduces the pixel values of the determined pixels and outputs a binary image formed by the determined pixels with the reduced pixel values.

Abstract: In a moire fringes eliminating apparatus, a moire fringe eliminating unit comprises a halftone dot feature extracting unit, a re-calculation unit, a re-calculation deciding unit, and a halftone dot shape changing unit. The halftone dot feature extracting unit extracts features of the halftone dots. The re-calculation unit obtains a re-calculation deciding value which represents a ratio between a total number of the halftone dots in a neighboring area and the number of the halftone dots having a similarity of feature being smaller than a predetermined threshold value in the neighboring area. The re-calculation deciding unit decides whether the threshold value should be changed in order to decide necessity of change of the number of dots based on the re-calculation deciding value.