Riso Laboratory, Inc.

Miel Renaud

Koichi Hashimoto

When an original wherein a plurality of binary image areas in different density or the like coexist is printed by stencil making, tone characteristics of a tone image area are preserved and blur or extinction of a faint letter, or smear of a letter written on a dark background in a binary image area is prevented from occurring and print without incongruity due to density different is obtained. An image processing apparatus comprises first analyzing device which analyzes whether a target pixel is in a binary image area or a tone image area, second analyzing device which calculates a secondary line feature indicative value regarding density difference between a line and its background when the target pixel is composing a line in a thickness equal to or less than a certain value, judging device which judges the degree or likelihood of weather the target pixel is in a binary image area or a tone image area by a grade, based on analysis result by the first analyzing device and the secondary line feature indicative value, adopted-density conversion device which converts density of the target pixel based on the judgment result, and binary conversion device which upon necessity converts the target pixel having been density-converted into binary data.

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Tokyo, Japan

Miel Renaud