An image processing apparatus sets a threshold value matrix for each of multiple color materials, and uses the set threshold value matrix to acquire a first threshold value. On the other hand, the image processing apparatus sets reference data on the basis of multivalued data of that color material. Then, the image processing apparatus calculates a second threshold value matrix by performing a predetermined process on the first threshold value on the basis of the reference data for that color material. Further, by comparing the second threshold value with the multivalued data, quantization data for printing a dot is generated. When doing this, the threshold value matrix and the reference data for that color material are set so as to make the graininess of a dot pattern of that color material lower than the graininess of a mixed color dot pattern obtained by mixing dot patterns of the respective multiple color materials.

An image processing method is for generating print data to cause a printing apparatus that prints a print image based on image data to execute printing, by repeating a pass operation in which a nozzle set forms dots on a printing medium while moving in a main scanning direction, and a feed operation in which the nozzle set and the printing medium are moved in a sub-scanning direction. The image processing method includes: performing a first and second halftone processes for a same region of the image data to respectively generate a first halftone data to determine a formation state of first dots and a second halftone data to determine a formation state of second dots, the first and second dots being formed by the nozzle set that ejects a same color of ink; and allocating the first halftone data and the second halftone data to pass operations.

An image processing apparatus has a first color conversion unit that converts a signal value at an achromatic grid point in a first color space among achromatic grid points in a color space, the signal value being closer to white than a first predetermined signal value, into a signal value that is even closer to white, and a second color conversion unit that converts a signal value at a grid point among grid points in the color space, the signal value being closer to white than a second predetermined signal value, into white are provided. The image processing apparatus converts a signal value of an input image using the first color conversion unit, and thereafter converting the signal value using the second color conversion unit.

The present disclosure is directed to a technique for outputting images so that a user can easily compare the image on which image processing is executed and the image on which image processing is not executed. In the technique, a first image of a region of an output target in a predetermined image on which predetermined image processing is not executed and a second image of the region of the output target in the predetermined image on which the predetermined image processing is executed are output by an output apparatus so that the first image and the second image are output and arranged in an output layout according to a shape of the region of the output target.

A printer includes a printing device and a controller. The controller of the printer acquires image data and detects character data indicating a character from the acquired image data. Further, the controller adds a broken line along an outline of the character indicated by the detected character data. The controller generates a multivalued image with multiple values based on an image including the character with the broken line added, converts the generated multivalued image into two gray scales, and generates a binarized image. Further, the controller causes the printing device to perform printing based on the generated binarized image.

An image forming apparatus includes: a determination section configured to determine whether there is a possibility of generation of an image defect during a printing job for image formation on a plurality of pages based on image data included in the printing job; and a changing section configured to change an order of the pages to be subjected to image formation such that an image defect is not generated when the determination section determines that there is a possibility of generation of the image defect.

An information processing apparatus generates a signal value for forming an image of an object as a recording layer on a recording medium. The apparatus inputs a characteristic of specular reflection light, a characteristic of internal diffuse reflection light, and a characteristic of surficial diffuse reflection light. Then, the apparatus derives, based on the characteristic of the internal diffuse reflection light, a first signal value for a first recording layer to be formed on the recording medium, and derives, based on the characteristic of the specular reflection light and the characteristic of the surficial diffuse reflection light, a second signal value for a second recording layer different from the first recording layer to be formed on the recording medium.

In an image forming apparatus a controller receives user instruction information for printing a test chart, controls a printer to print the test chart on a sheet regardless of a result of reading mode selection, controls a display to display a screen for selecting a reading mode for reading the test chart among a plurality of reading modes, and controls a conveyance roller and a reading sensor to read the test chart on the sheet while conveying a stacked sheet in a case where a first reading mode is selected on the screen. The controller also controls the reading sensor to read the test chart on the sheet on a platen in a case where a second reading mode is selected on the screen, and controls density of the image to be printed by the printer based on a reading result of the test chart by the reading sensor.

An image processing device includes circuitry to segment an image corresponding to input image data into a black text area including black text and a non-black text area of the image data other than the black text area, perform a first type of color correction on pixel data items in the black text area and a second type of color correction on pixel data items in the non-black text area to generate a processed image, and determine whether or not the image is a color image using the processed image. The second type of color correction is different from the first type of color correction.

An image processing apparatus sets a threshold value matrix for each of multiple color materials, and uses the set threshold value matrix to acquire a first threshold value. On the other hand, the image processing apparatus sets reference data on the basis of multivalued data of that color material. Then, the image processing apparatus calculates a second threshold value matrix by performing a predetermined process on the first threshold value on the basis of the reference data for that color material. Further, by comparing the second threshold value with the multivalued data, quantization data for printing a dot is generated. When doing this, the threshold value matrix and the reference data for that color material are set so as to make the graininess of a dot pattern of that color material lower than the graininess of a mixed color dot pattern obtained by mixing dot patterns of the respective multiple color materials.