A method for closed-loop color control in printing machines using a computer includes initially coating a printing substrate with opaque white to set up closed-loop color control in the course of a print job, subsequently applying process colors and, in the process, color measurement strips onto the opaque white, recording the opaque white and the color measurement strips using a measuring device, and, based on data recorded by the measuring device, performing closed-loop color control for process colors and opaque white using the computer. The measuring device is an inline measuring device and is initially calibrated at a fixed position of the printing substrate, then the application of opaque white is adjusted and, when a deviation stays below a maximum deviation, closed-loop control of both the opaque white and the process colors is done using the computer by taking measurements in the color control strip.

A method for printing at least a first and a later print job includes receiving a first print job containing first image data of one or more first images to be printed in a printable area and a later print job containing later image data associated with a colour, determining a first sub-area of said printable area where no image of the first images is to be printed, using the first image data; printing the one or more first images in the printable area and at least one first control patch in the first sub-area, using for said at least one first control patch at least one colour representative for the colour associated with the later image data, measuring the colour of the printed at least one first control patch, and using the measured colour of the at least one first control patch for controlling the later print job.

An object of the present disclosure is to implement, at a low cost, highly accurate color calibration in a printing apparatus that performs printing using fluorescent ink. One embodiment of the present invention is an image processing apparatus that includes: a processing unit configured to perform processing relating to color calibration in a printing apparatus that prints an image on a printing medium using fluorescent printing material; and an execution unit configured to perform calibration processing of the printing apparatus based on a measured value that is obtained by measuring a patch chart for obtaining information on an amount of application of the fluorescent printing material in the printing apparatus, wherein a patch included in the patch chart is printed with the fluorescent printing material and subtractive color mixture printing material and at least one dot of the subtractive color mixture printing material covers a dot of the fluorescent printing material.

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 perform uniformity compensation of a plurality of secondary colors printed by pel forming elements, each of the pel forming elements associated with one of a plurality of primary colors, including generating a uniformity compensated first primary color transfer function for each of the pel forming elements associated with a first primary color and a uniformity compensated second color transfer function for each of the pel forming elements associated with a second primary color, generating an updated uniformity compensated first primary color transfer function for each of the pel forming elements associated with the first primary color and a uniformity compensated third primary color transfer function for each of the pel forming elements associated with a third primary color and generating an updated uniformity compensated second primary color transfer function for each of the pel forming elements associated with the second primary color and an updated uniformity compensated third primary color transfer function for each of the pel forming elements associated with a third primary color.

An information processing apparatus is provided. The apparatus comprises at least one memory; and at least one processor, wherein the at least one memory stores at least one program that causes the at least one processor to perform operations including acquiring, periodically, in response to a request, or both, a color verification result of a printed article printed by an image forming apparatus from a storage storing a color measurement result of a printed article printed by the image forming apparatus, and in a case where the color verification result for the image forming apparatus to execute an instructed image forming satisfies a reference, executing the instructed image forming.

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 perform uniformity compensation of a plurality of secondary colors printed by pel forming elements, each of the pel forming elements associated with one of a plurality of primary colors, including generating a uniformity compensated first primary color transfer function for each of the pel forming elements associated with a first primary color and a uniformity compensated second color transfer function for each of the pel forming elements associated with a second primary color, generating an updated uniformity compensated first primary color transfer function for each of the pel forming elements associated with the first primary color and a uniformity compensated third primary color transfer function for each of the pel forming elements associated with a third primary color and generating an updated uniformity compensated second primary color transfer function for each of the pel forming elements associated with the second primary color and an updated uniformity compensated third primary color transfer function for each of the pel forming elements associated with a third primary color.

A printing system is disclosed. The printing system includes at least one physical memory device to store halftone calibration logic and one or more processors coupled with the at least one physical memory device to execute the halftone calibration logic determine an uncalibrated deposition distribution for each of a plurality of pel forming elements, determine a calibrated deposition distribution for each of the plurality of pel forming elements and determine calibration values for each of the plurality of pel forming elements.

A printing system is disclosed. The printing system includes at least one physical memory device to store halftone calibration logic and one or more processors coupled with the at least one physical memory device to execute the halftone calibration logic determine an uncalibrated deposition distribution for each of a plurality of pel forming elements, determine a calibrated deposition distribution for each of the plurality of pel forming elements and determine calibration values for each of the plurality of pel forming elements.

An information processing apparatus is provided. The apparatus comprises at least one memory; and at least one processor, wherein the at least one memory stores at least one program that causes the at least one processor to perform operations including acquiring, periodically, in response to a request, or both, a color verification result of a printed article printed by an image forming apparatus from a storage storing a color measurement result of a printed article printed by the image forming apparatus, and in a case where the color verification result for the image forming apparatus to execute an instructed image forming satisfies a reference, executing the instructed image forming.

An image processing apparatus includes a control unit configured to control execution of monochromatic calibration and multi-color calibration, and a registration unit configured to register paper types of paper to be used at time of execution of the monochromatic calibration, a monochromatic target value set for each of the paper types used for the monochromatic calibration, paper types of paper to be used at time of execution of multi-color calibration, and a multi-color target value set for each of the paper types used for the multi-color calibration. The image processing apparatus executes the multi-color calibration, after executing the monochromatic calibration, via the control unit by using paper of a paper type selected from common paper types out of the registered paper types and the monochromatic target value and the multi-color target value set for the selected paper type.