In a case where image data for which brief spot color matching has been performed is stored by a BOX function, it is not possible to output the image data in correct color on a condition that the image data is transmitted to another device as it is. In a case where image data is stored by the BOX function, in a printer driver that generates PDL data therefor, a color matching method of type accompanied by the brief spot color matching is not allowed to be set.

Examples described herein relate to a system consistent with the disclosure. For instance, the system may comprise a printing device including hardware to form markings on a print medium, a memory resource, and a controller to receive a print job to form the markings on the print medium, render a page description language of the print job to form the markings, determine an object type image of the print job, designate pixels of the determined object type image to form a covert dot pattern on the image, and adjust colors of the designated pixels to form the covert dot pattern on the markings.

An image forming apparatus that executes hidden-surface elimination can output an image containing an undercoat desired by a user. The image forming apparatus includes an elimination unit that eliminates a region included in a region of a second drawing object in a layer below a first drawing object and overlapping the first drawing object. The first drawing object is contained in an intermediate data which is generated based on page description language data. In a case where the second drawing object is not a drawing object indicating an undercoat image, the elimination unit eliminates the region included in the region of the second drawing object and overlapping the first drawing object. In a case where the second drawing object is a drawing object indicating an undercoat image, the elimination unit does not eliminate the region included in the region of the second drawing object and overlapping the first drawing object.

In a case where image data for which brief spot color matching has been performed is stored by a BOX function, it is not possible to output the image data in correct color on a condition that the image data is transmitted to another device as it is. In a case where image data is stored by the BOX function, in a printer driver that generates PDL data therefor, a color matching method of type accompanied by the brief spot color matching is not allowed to be set.

The technique of the present disclosure can achieve processing efficiency and prevention of improper drawing in printing a monochrome representation of color data. In performing discriminability reproducing color conversion processing, a PDL analysis unit determines whether processing involving color change that changes the original color is specified in operator information on a target object for the discriminability reproducing color conversion processing. In a case where processing that changes the original color, such as ROP or α-blending, is specified for the target object, the discriminability reproducing color conversion processing for the page is canceled and switched to all-color uniform color conversion processing. This enables both of efficient discriminability reproducing color conversion and prevention of improper drawing.

The technique of the present disclosure can achieve processing efficiency and prevention of improper drawing in printing a monochrome representation of color data. In performing discriminability reproducing color conversion processing, a PDL analysis unit determines whether processing involving color change that changes the original color is specified in operator information on a target object for the discriminability reproducing color conversion processing. In a case where processing that changes the original color, such as ROP or α-blending, is specified for the target object, the discriminability reproducing color conversion processing for the page is canceled and switched to all-color uniform color conversion processing. This enables both of efficient discriminability reproducing color conversion and prevention of improper drawing.

Examples described herein relate to a system consistent with the disclosure. For instance, the system may comprise a printing device including hardware to form markings on a print medium, a memory resource, and a controller to receive a print job to form the markings on the print medium, render a page description language of the print job to form the markings, determine an object type image of the print job, designate pixels of the determined object type image to form a covert dot pattern on the image, and adjust colors of the designated pixels to form the covert dot pattern on the markings.

In a case where image data for which brief spot color matching has been performed is stored by a BOX function, it is not possible to output the image data in correct color on a condition that the image data is transmitted to another device as it is. In a case where image data is stored by the BOX function, in a printer driver that generates PDL data therefor, a color matching method of type accompanied by the brief spot color matching is not allowed to be set.

Methods and apparatus for encoding data streams are provided. A computing device can receive an encoder-input data stream (EIDS) encoded in a encoder-input format. The computing device can reformat the EIDS into an encoder-output data stream (EODS) encoded in an encoder-output format that differs from the encoder-input format. The EODS can include a page table for pages, resources of the pages that include reusable resources used multiple times, and binary-formatted commands related to the resources, which are stored in stored in first-come, first-served fashion. The page table can refer to pages of the EODS. The EODS can be based on a resource table storing entries for each reusable resource. Each reusable resource is stored only once in the EODS. The computing device can generate an output based on the EODS.

Methods and apparatus for encoding data streams are provided. A computing device can receive an encoder-input data stream (EIDS) encoded in a encoder-input format. The computing device can reformat the EIDS into an encoder-output data stream (EODS) encoded in an encoder-output format that differs from the encoder-input format. The EODS can include a page table for pages, resources of the pages that include reusable resources used multiple times, and binary-formatted commands related to the resources, which are stored in stored in first-come, first-served fashion. The page table can refer to pages of the EODS. The EODS can be based on a resource table storing entries for each reusable resource. Each reusable resource is stored only once in the EODS. The computing device can generate an output based on the EODS.