Abstract: Average density values are calculated from a pixel group which contains an objective pixel and neighboring pixels around the objective pixel, and an image filter to use for processing of the objective pixel is specified in accordance with the average density values. Using the specified image filter, filter computation is performed on a main signal which represents the density of the objective pixel, whereby an output signal is generated. The main signal which represents the objective pixel is smoothed out in an area which is larger than the size of halftone dots. In accordance with the average density values, a reference value is acquired. A set of weighting factors is selected based on the reference value, thereby determining an effective size of the image filter. The determined effective size is large in a density range where moires are noticeable.

Abstract: The present invention is directed to a method of and an apparatus for applying predetermined processing to an original image pixel by pixel. A main signal (S) regarding an objective pixel which is a pixel which is to be processed is supplied to an average density value extracting portion (10), a multiplier (51), and a filter computation portion (30). The filter computation portion (30) executes computation based on an image filter which has a larger size than the size of halftone dots, to thereby generates a filtered signal (S′). The average density value extracting portion (10) extracts an average density value (D) in an area which is larger than the size of the halftone dots, and supplies the average density value (D) to a table reference portion (20). The table reference portion (20) identifies a mixing rate (M) for mixing in the main signal (S) and a mixing rate (1−M) for mixing in the filtered signal (S′), in accordance with the average density value (D).

Abstract: A color image outputting apparatus adapted to generate display image data for simulatively displaying on an image displaying apparatus a color image to be formed on a recording sheet by means of an image recording apparatus. The apparatus includes: a conversion table for converting color image data into first color image data which exclude any influences of a ground color of the recording sheet; and a ground color correction circuit for correcting the first color image data outputted from the conversion table into second color image data in consideration of the ground color of the recording sheet to be used in the image recording apparatus. A data correction process to be performed by the ground color correction circuit is determined so that a measurement result on the ground color of the recording sheet is equated with a measurement result on a background color of the image displayed on the image displaying apparatus which corresponds to the ground color of the recording sheet.