An image forming apparatus includes a receiving unit that receives plural pieces of print data described in plural types of page description languages, plural drawing processors that respectively correspond to the plural types of page description languages, extract specific drawing objects from the plural pieces of print data, and convert the specific drawing objects into print image data, and an output unit that compares the print image data that the drawing processors have converted the specific drawing objects into, and outputs comparison results.

A chart creation method to be used in a system including an image forming apparatus and a control apparatus, the control apparatus and a non-transitory computer-readable medium storing a chart creation control program are provided. The chart creation method includes: creating a print image of a chart; giving instructions to the image forming apparatus to print the chart and measure colors of the chart; obtaining measured color values of the color patches of the chart from the image forming apparatus; and rearranging the color patches of the chart so as to restrict spread of average color values of subgroups of color patches in the chart within a predetermined range. The chart creation method further includes: creating a print image of the color chart including the rearranged color patches, and giving instructions to the image forming apparatus to print the chart and measure colors of the chart.

A printing system is disclosed. The printing system includes an interpreter module to generate Tagged Object Bit-plane data corresponding to drawing objects for each colorant of a device color space during rasterization a print job data and a common buffer to store the Tagged Object Bit-plane data for each colorant.

A method of enhancing quality of an image object included in a compound document, and an apparatus for performing the method are provided. The method includes receiving a request to print a compound document including an image object, merging parts corresponding to the image object from among data corresponding to the compound document and enhancing the quality of the image object, and encoding data corresponding to the compound document by using a printer control language (PCL) and outputting the encoded data.

An image processing method in which image data including a grayscale value in each pixel is converted into print data including formation necessity of dots, includes extracting a region in which a total value of the grayscale value of the pixel included in each predetermined division in which the image data is divided does not become a predetermined threshold value as a non-processing region; and extracting a region surrounded with the non-processing region as a processing region.

An image processing apparatus includes an image processor that performs error diffusion processing by applying an error diffusion matrix to multi-valued image data having pixels two-dimensionally arranged, so as to convert the multi-valued image data into binary image data. The binarization unit applies an error diffusion matrix in which the diffusion coefficient of a pixel diagonal to a focused-on pixel is greater than those of other pixels.

A printer is caused to perform duplex printing by an information processing device in which an OS standard printing program is installed. When causing a printer connected to a PC to execute duplex printing based on a print instruction output from an editing application installed in the PC, an auxiliary program that supports the printer executes rotation processing of rotating an image of a page, which is required to be rotated, by 180° for intermediate data received from a general-purpose print program, executes rearrangement processing of rearranging a processing order from a page order to a print order for print data received from the general-purpose print program, according to a sheet conveying aspect of the printer, and transmits the print data after the rotation processing and the rearrangement processing from the PC to the printer.

A first conversion into pixels of an obtained object, for which the processing for widening the width of the object is performed, is performed, and a second conversion into pixels of the object, for which the processing for widening the width of the object is not performed, is performed. When the first conversion is performed, a pixel is filled or is not filled with color depending on a position of a boundary of the object in the pixel. When the second conversion is performed, a pixel is filled with color if the position of the boundary of the object exists in the pixel.

Provided is an information processing apparatus including: a PDL analysis unit that acquires an output resolution of input PDL data when a tile drawing instruction is included in the PDL data, and calculates a drawing size of a tile drawing based on the tile drawing instruction and the output resolution; an average color calculation unit that calculates an average color of the tile drawing based on the tile drawing instruction when the calculated drawing size is smaller than a predetermined value; and a rendering unit that renders the tile drawing instruction based on the calculated average color. The average color calculation unit calculates the average color based on a transparency level of a unit tile included in the tile drawing instruction.

A method for modifying color density values in a dot-based printing system uses a control unit. The control unit implements the modification of the color density values after a raster image has been created and modifies the number and/or size of print dots to be applied to a printing substrate in order to attain pre-defined color density target values.