Abstract: The printing device 3 includes a print control unit 37 which, if an authentication print job data is received at a timing when transition from a ready mode to a sleep mode is about to occur, causes the printing device 3 to transit to the sleep mode and, and if a normal print job data is received at the timing, causes a printing engine unit 35 to print the normal print job data before transiting to the sleep mode.

Abstract: An image processing device determines whether or not a data size per page of a received print job is greater than a preset threshold. When it is determined that the data size is greater than the threshold, the image processing device estimates a first RIP time per page, which is the time required to RIP process when a resolution of an image of the print job is not optimized, an optimization time per page, which is the time required to optimize, and a second RIP time per page when the resolution of the image of the print job is optimized. Then, the image processing device optimizes the resolution of the image of the print job on the basis of the first RIP time, the optimization time, and the second RIP time so that the rates of decreasing the resolution in each image after conversion are substantially the same.

Abstract: A density corrector performs a density correction processing on a resolution-converted image dataset to obtain a density-corrected image dataset by: determining whether each of first and second pixels in the resolution-converted image dataset is a deletion-target pixel, the first pixels each being a pixel located at a position including a longitudinal edge in a second original image, the second pixels each being a pixel located at a position including a lateral edge in the second original image, patterns of edges in regions in the first and second original images corresponding to the deletion-target pixel being the same; correcting a density of the deletion-target pixel to “0”; and correcting a density of respective pixels other than the deletion-target pixel among the first and second pixels to a value equal to or larger than an original density of the respective pixels.

Abstract: An image processing apparatus calculates a first data amount that is a data amount per page of a print job, and extracts images having a resolution that exceeds a printing resolution from among images included in the print job when the first data amount is greater than a threshold value. The image processing apparatus converts the resolution of the extracted images into the printing resolution, and calculates a second data amount that is a data amount per page of the print job after conversion into the printing resolution. The image processing apparatus causes a user to select an element from among printing speed and image quality when the second data amount is greater than a threshold value. The image processing apparatus reduces the resolutions of the images included in the print job when the selected element is the printing speed.

Abstract: An image processing device includes a print image data generator and a density adjuster. The print image date generator generates print image data for each of colors to be used to print a document image from image data of the document image including a barcode image and a background image overlapped on the barcode image as a background. The density adjuster performs at least one of processing to reduce the density of the barcode image in at least any one of pieces of the print image data of colors including the barcode image and processing to reduce the density of the background image within a neighboring region that neighbors a bar of the barcode image in at least any one of pieces of the print image data of colors including the background image.

Abstract: An image processing device determines whether or not a data size per page of a received print job is greater than a preset threshold. When it is determined that the data size is greater than the threshold, the image processing device estimates a first RIP time per page, which is the time required to RIP process when a resolution of an image of the print job is not optimized, an optimization time per page, which is the time required to optimize, and a second RIP time per page when the resolution of the image of the print job is optimized. Then, the image processing device optimizes the resolution of the image of the print job on the basis of the first RIP time, the optimization time, and the second RIP time so that the rates of decreasing the resolution in each image after conversion are substantially the same.

Abstract: A density corrector performs a density correction processing on a resolution-converted image dataset to obtain a density-corrected image dataset by: determining whether each of first and second pixels in the resolution-converted image dataset is a deletion-target pixel, the first pixels each being a pixel located at a position including a longitudinal edge in a second original image, the second pixels each being a pixel located at a position including a lateral edge in the second original image, patterns of edges in regions in the first and second original images corresponding to the deletion-target pixel being the same; correcting a density of the deletion-target pixel to “0”; and correcting a density of respective pixels other than the deletion-target pixel among the first and second pixels to a value equal to or larger than an original density of the respective pixels.

Abstract: A printing device includes a barcode area dividing unit that divides a barcode area of a printing sheet into plural division areas along a Y direction, and a barcode area ejection amount conversion and output unit that controls an ink jet printing unit to print black bars such that an X direction is a direction in which the black bars and white bars are alternately arranged and occupancy dimensions of ink of pixels are different in the division areas divided by the barcode area dividing unit.

Abstract: A printing device includes a barcode area dividing unit that divides a barcode area of a printing sheet into plural division areas along a Y direction, and a barcode area ejection amount conversion and output unit that controls an ink jet printing unit to print black bars such that an X direction is a direction in which the black bars and white bars are alternately arranged and occupancy dimensions of ink of pixels are different in the division areas divided by the barcode area dividing unit.

Abstract: An image processing device includes a print image data generator and a density adjuster. The print image date generator generates print image data for each of colors to be used to print a document image from image data of the document image including a barcode image and a background image overlapped on the barcode image as a background. The density adjuster performs at least one of processing to reduce the density of the barcode image in at least any one of pieces of the print image data of colors including the barcode image and processing to reduce the density of the background image within a neighboring region that neighbors a bar of the barcode image in at least any one of pieces of the print image data of colors including the background image.

Abstract: A color conversion is performed to convert a data of a pixel of black in an object as determined to be a mask into a pixel data of composite black, and convert a data of a pixel of black in an object as not determined to be any mask into a pixel data of composite black or real black, and a set of pixel data of an object as color-converted is operated and processed as a source.

Abstract: An image forming machine transitions into a sleep mode at a preset time of day, and keeps the sleep mode for a prescribed interval. The image forming machine includes an I/O interface, a printer, a memory, and a controller. The interface inputs a print job. The printer executes a printing of the print job. The memory stores therein an entirety or part of the print job overlapping the interval of the sleep mode, as a hold job.

Abstract: The printing device 3 includes a print control unit 37 which, if an authentication print job data is received at a timing when transition from a ready mode to a sleep mode is about to occur, causes the printing device 3 to transit to the sleep mode and, and if a normal print job data is received at the timing, causes a printing engine unit 35 to print the normal print job data before transiting to the sleep mode.

Abstract: For a halftone representation of a grayscale data of an original image of P tones, an output resolution, a screen ruling frequency, and a screen angle are based to set a basic array of L×L pixels, where L is an integer greater than 1, and a number N of tones reproducible by the basic array is compared with P to generate a dither array using the basic array as its sub-array, such that numbers are assigned to pixels of sub-arrays by a prescribed rule, in order between the sub-arrays, starting from prescribed ones of centered and centermost pixels of the sub-arrays.

Abstract: A color conversion is performed to convert a data of a pixel of black in an object as determined to be a mask into a pixel data of composite black, and convert a data of a pixel of black in an object as not determined to be any mask into a pixel data of composite black or real black, and a set of pixel data of an object as color-converted is operated and processed as a source.

Abstract: For a halftone representation of a grayscale data of an original image of P tones, an output resolution, a screen ruling frequency, and a screen angle are based to set a basic array of L×L pixels, where L is an integer greater than 1, and a number N of tones reproducible by the basic array is compared with P to generate a dither array using the basic array as its sub-array, such that numbers are assigned to pixels of sub-arrays by a prescribed rule, in order between the sub-arrays, starting from prescribed ones of centered and centermost pixels of the sub-arrays.

Abstract: The types of pixels of an image made up of a plurality of pixels arranged in a first direction and a second direction substantially perpendicular to the first direction are distinguished. The image is divided into a plurality of blocks, the number of pixels which are determined to be an edge pixel in each block is counted, and whether each of pixels in each block is a halftone pixel is determined on the basis of the number of the pixels which are determined to be an edge pixel in the block. When a plurality of pixels continuous in the first direction and/or the second direction are determined to be edge pixels, the number of edge pixels in each block is modified by counting as an edge pixel only a predetermined number of pixels in the set of the pixels consisting of the continuous pixels which are determined to be an edge pixel, and whether each pixel in the block is a halftone pixel is determined on the basis of the modified number of the edge pixels in the block.

Abstract: Halftone pixels are distinguished from non-halftone pixels in pixels making up an image according to a predetermined algorithm based on a result of edge detection for determining whether the pixels are edge pixels. The pixels which have been determined to be non-halftone pixels according to the predetermined algorithm, are continuous to the pixels determined to be halftone pixels according to the predetermined algorithm including those which have been redetermined to be halftone pixels and are not lower than a predetermined threshold density in density are all redetermined to be halftone pixels.

Abstract: Halftone pixels are distinguished from non-halftone pixels in pixels making up an image according to a predetermined algorithm based on a result of edge detection for determining whether the pixels are edge pixels. The pixels which have been determined to be non-halftone pixels according to the predetermined algorithm, are continuous to the pixels determined to be halftone pixels according to the predetermined algorithm including those which have been redetermined to be halftone pixels and are not lower than a predetermined threshold density in density are all redetermined to be halftone pixels.

Abstract: The types of pixels of an image made up of a plurality of pixels arranged in a first direction and a second direction substantially perpendicular to the first direction are distinguished. The image is divided into a plurality of blocks, the number of pixels which are determined to be an edge pixel in each block is counted, and whether each of pixels in each block is a halftone pixel is determined on the basis of the number of the pixels which are determined to be an edge pixel in the block. When a plurality of pixels continuous in the first direction and/or the second direction are determined to be edge pixels, the number of edge pixels in each block is modified by counting as an edge pixel only a predetermined number of pixels in the set of the pixels consisting of the continuous pixels which are determined to be an edge pixel, and whether each pixel in the block is a halftone pixel is determined on the basis of the modified number of the edge pixels in the block.