Provided are a control apparatus, an image processing method and a non-transitory recording medium. The control apparatus includes a raster-image processor and a hardware processor that judges whether each of multi-valued pixels forming a source image is colored in one of specific colors, controls the amount of color materials to be used in printing the source image together with a white base, by reducing pixel values of the multi-valued pixels forming the source image and the white base, and converts the multi-valued pixels into two-valued pixels corresponding to colors of the color materials of the source image and two-valued white pixels. The hardware processor uses a matrix of two-valued white pixels corresponding to each of the multi-valued pixels judged as being colored in one of the specific colors, to rearrange at least one of colored two-valued white pixels at colored or uncolored pixel positions in the matrix.

An inkjet recording device and an inkjet recording method are provided to suppress occurrence of banding in an inkjet recording technology using a plurality of heads. Control is performed on two heads in which some of nozzles of one head overlap nozzles of the other head such that at least one head does not perform ejection from nozzles included in the overlapping nozzles and positioned at ends of nozzle rows.

Provided is an inkjet recording device and an inkjet recording method that can selectively perform a high-speed recording mode or a high-quality recording mode without requiring a process of changing configurations of nozzle rows. The head control section performs the discharge control by using all the nozzles belonging to the nozzle groups of respective colors as the usable range Ru in the case where the high-speed mode is designated by the mode designating section. On the other hand, in the case where the high-quality mode is designated, the head control section determines, for each color, the usable range Ru being a part of the nozzle range Rn configured by the nozzle groups, and performs the discharge control using only the nozzles belonging to the usable ranges Ru so as to cause the ink droplets to be discharged according to the particular color order at any positions on the recording medium.

An inkjet recording device and an inkjet recording method are provided to suppress occurrence of banding in an inkjet recording technology using a plurality of heads. Control is performed on two heads in which some of nozzles of one head overlap nozzles of the other head such that at least one head does not perform ejection from nozzles included in the overlapping nozzles and positioned at ends of nozzle rows.

Printing with a single colorant a security feature imperceptible to the naked eye. For a digital security image having a first region formed by a first pattern of binary pixels and a second region formed by a different second pattern of binary pixels, the first and second patterns are printed with the single colorant. A darker one of the first and second printed patterns is determined. The security image is printed with the single colorant, the region corresponding to the darker printed pattern printed at a reduced gray level such that the printed first and second regions appear substantially indistinguishable to the naked eye.

Provided are a density unevenness correction data creation method, a density unevenness correction data creation apparatus, a printing system, a program, a test chart, and a test chart data creation apparatus in which density unevenness correction with high accuracy is implemented. A captured image of a test chart including a density step pattern, an alignment mark, and a line mark is acquired, and in a case of acquiring correspondence relationship information between a theoretical position and an imaging position from the captured image, a rough correspondence relationship is acquired by using positional information of the alignment mark, a detailed correspondence relationship is acquired by using positional information of the line mark estimated by using the rough correspondence relationship, and density unevenness correction data is created by estimating a density value of each position of the density step pattern by using the detailed correspondence relationship.

A printing system is disclosed. The printing system includes at least one physical memory device to store calibration logic and one or more processors coupled with the at least one physical memory device to execute the calibration logic to receive operating point data corresponding to an image processing system, receive a full range transfer function corresponding to an image processing system and generate a sub range transfer function corresponding to the image processing system for each of a plurality of digital count values based on the operating point data and the full range transfer function.

A printing system includes a machine readable storage medium storing instructions and a processor to execute the instructions. The processor is to execute the instructions to receive a source image comprising a plurality of regions and analyze each region of the plurality of regions to determine an ink density of each region. The processor is to execute the instructions to further in response to the ink density for a region exceeding a threshold, deplete the ink density for the region; and in response to the ink density for a region not exceeding the threshold, maintain the ink density for the region. The processor is to execute the instructions to further combine the depleted regions and the maintained regions to generate an optimized image.

A printing apparatus includes: a printing unit configured to eject a color material ink and a reaction liquid; a controller configured to control the printing unit such that the printing unit prints a first test pattern in which a plurality of patches are arranged; a first obtaining unit configured to obtain an optical density for each of the plurality of patches; a second obtaining unit configured to obtain a specular reflection intensity for each of the plurality of patches; and a first generation unit configured to generate correction information based on the optical density obtained by the first obtaining unit, the specular reflection intensity obtained by the second obtaining unit, a first target value of the optical density for a first input value of the color material ink, and a second target value of the specular reflection intensity for a second input value of the reaction liquid.