A method for controlling a printing process is disclosed. The method includes printing a printing material by a printing unit on a basis of data of a prepress stage. A printed result on the printing material is compared with a desired value and a correction value is derived from the comparison. The data of the prepress stage is corrected with the correction value.

The occurrence of image quality adverse effects, such as interference fringes and color bleeding, is suppressed for an object including a spot color adjustment-target color. In a case where a spot color adjustment function is made use of, the same color separation table is caused to be applied uniformly, instead of switching color separation tables to be applied to an adjustment-target color depending on whether the object attribute is text/line/graphics, or image.

A graphics adaptation method for printable ceramic supports. Images are printed on sample ceramic supports starting from an original image file. A sample printed image is acquired. Sample points representative of the sample image are selected. Original points present in the original image file are also selected. A point-based matching is sought between the sample points and the original points, on the basis of which the original image file is modified and an adapted image file is determined, thus adapting the graphics of the original image file to the graphics of the sample image. A graphics adaptation system based on the method is also described.

An information processing device configured to make a printing device execute printing includes a storage section configured to store special color data representing a special color included in a print target image, and a processing section configured to make the printing device print a special color patch as a color patch of the special color included in the print target image based on the special color data to obtain a colorimetric value of the special color patch. Based on the print target image and the special color data, the processing section makes the printing device execute printing of the special color patch in accordance with output of a print image based on the print target image.

An image forming apparatus includes: a scanner to read each of a first output product serving as a model and a second output product output from the image forming apparatus; a memory that stores a color conversion lookup table to be used when color conversion is performed from a RGB color system into a CMYK color system; and circuitry to correct the color conversion lookup table based on a number of pixels and an amount of change per hue, using read information on the first output product, and re-correct the corrected color conversion lookup table, using read information on the second output product.

An image processing apparatus comprises a unit configured to set a color selected by a user from among colors included in scanned image data obtained by reading a reference sample as a destination color for the adjustment-target color. Then, the unit configured to set a destination color has a function to set the destination color based on first scanned image data obtained by reading a color sample as the reference sample, in which patches of a plurality of colors including colors around the adjustment-target color are printed and a function to set the destination color based on second scanned image data obtained by reading a sample document.

The occurrence of image quality adverse effects, such as interference fringes and color bleeding, is suppressed for an object including a spot color adjustment-target color. In a case where a spot color adjustment function is made use of, the same color separation table is caused to be applied uniformly, instead of switching color separation tables to be applied to an adjustment-target color depending on whether the object attribute is text/line/graphics, or image.

The application relates to a method for controlling a printing process for printing a decorative target image on a substrate, comprising providing the decorative target image to be printed in the printing process by at least one decorative parameter data set, simulating the printing process in a simulation step based on the decorative parameter data set, at least one printing process parameter data set and stored historical printing data sets, such that a digital decorative image is generated, verifying the generated digital decorative image based on the decorative target image to be printed and at least one verification criterion, and if the verification criterion is met, outputting the printing process parameter data set used in the simulation step for performing the printing process.

The occurrence of image quality adverse effects, such as interference fringes and color bleeding, is suppressed for an object including a spot color adjustment-target color. In a case where a spot color adjustment function is made use of, the same color separation table is caused to be applied uniformly, instead of switching color separation tables to be applied to an adjustment-target color depending on whether the object attribute is text/line/graphics, or image.

In a data generating apparatus, a processor acquires offset information indicating a deviation in a colorant usage used by a specific print execution unit from a standard amount of usage. The standard amount of usage is a standard quantity concerning colorant used by print execution units. The processor controls the specific print execution unit to print a first patch image and generates first control data using first read data based on the first patch image. The processor generates corrected first control data using the offset information. The processor controls the specific print execution unit to print a second patch image using the corrected first control data and generates second control data using second read data based on the second patch image. The first and second control data is for common use in the printing processes performed on the print execution units.