摘要:
This invention provides an image processing apparatus capable of outputting a color image by reducing the information amount of each color component of the image by a method suited to the color component without deteriorating the quality of the image, and an image printing apparatus capable of printing an image without deteriorating the quality of the image, on the basis of received image data. Of color image data to be transmitted to the image printing apparatus (which uses, e.g., six colors Y, M, C, Bk, LC, and LM), the image processing apparatus quantizes colors (LC and LM) whose tone quality is important by a large number of gray levels (e.g., nine values), and does not compress these colors. The image processing apparatus quantizes colors (Y, M, C, and Bk) whose tone quality is not important by the number of gray levels (e.g., five values) by which the compression efficiency is improved, and then compresses these colors, thereby reducing the transmission data amount. The image printing apparatus prints the image of received image data by directly using uncompressed data and expanding compressed data.
摘要:
A color ink-jet head, having plural arrays of nozzles side by side in a main scan direction corresponding to different color inks, is moved to scan reciprocally. In a multi-pass recording for divided recording on an area by scanning at plural times with the head, an ink firstly landed on recording of the area determines a prioritized color influential on the color tone. Moreover, a printing medium is largely covered by the recording of first two passes. A harmful influence on a whole image by the color irregularity can reduced by suppressing the color irregularity in the two passes, therefore, the data recording ratio of the first pass to the area is set smaller than that of the second pass and thereafter. Further, for such the control, a pseudo periodical masking data arranging record prohibiting pixels and record permitting pixels in a visually agreeable state is introduced.
摘要:
By performing printing by a reduced number of main scanning times and by a bind pitch of a period which is imperceptible to human vision, a printing apparatus and a printing method for forming an image of visually imperceptible banding artifacts is provided. For this purpose, in a printing apparatus wherein a printing head is scanned for a plurality of times in a main scanning direction and at each scanning the printing head is divided into a plurality of blocks and printing is made to a region corresponding to each of the blocks by multi-scanning printing, the region is formed by printing one divided region in each of the plurality of scans in a transporting direction.
摘要:
With an ink jet head having for each color two parallel columns of nozzles arranged shifted by one-half the pitch, odd-numbered rasters and even-numbered rasters are printed by the two nozzle columns. The registration between the odd- and even-numbered rasters is secured during the printing to produce a high quality image. The ink ejection timing between the two raster groups is shifted by a predetermined interval to form adjustment patterns; the adjustment patterns are checked and, according to the check result, an adjustment value for the ink ejection timing between the two ink nozzle columns is entered, and the entered adjustment value is stored to be reflected on the actual printing operation. To facilitate the adjustment pattern check, the adjustment patterns have a dot distribution with a blue noise characteristic at a resolution at which the printing apparatus can print.
摘要:
By using an ink jet head, which has for each color two parallel columns of nozzles arranged side by side in the main scan direction and shifted from each other by one-half the pitch at which the nozzles are arranged in each column, odd-numbered rasters and even-numbered rasters making up an image are printed by the two nozzle columns. The registration between the odd- and even-numbered rasters is secured during the printing to produce an image with high print quality. For that purpose, the ink ejection timing between the two raster groups is shifted by a predetermined interval to form a plurality of adjustment patterns; the adjustment patterns printed are checked and, according to the check result, an adjustment value for the ink ejection timing between the two ink nozzle columns is entered, and the entered adjustment value is stored to be reflected on the actual printing operation. To facilitate the adjustment pattern check, the plurality of adjustment patterns have a dot distribution with a blue noise characteristic at a resolution at which the printing apparatus can print.
摘要:
A contamination of a printing medium caused by ink mist or the like is suppressed, which may scatter or float in an apparatus when margin-less printing is carried out in an ink jet printer. When margin-less printing for an edge of a printing medium P is performed, a predetermined edge area {circle around (1)} is printed using a smaller number of ejection openings during one scanning operation than that used for other areas {circle around (2)} and {circle around (3)}, while taking transportation errors relating to this end into consideration. This reduces the amount of ink mist resulting from ink ejected out of the edge of the printing medium during one scanning operation.
摘要:
An image forming system includes an electronic device and image forming device. The electronic device has a recording unit for recording a target image together with a recording condition of the target image and an output unit for outputting an image and a recording condition recorded by the recording unit. The image forming device has a requesting unit for requesting the electronic device to output an image to be formed and an image forming unit for applying an image processing to an image output by the output unit responsive to a request by the requesting unit. The requesting unit controls a quality of an image that the image forming device requests the electronic device to output in conformity with the recording condition and an image forming condition.
摘要:
When recording a gradation pixel by performing pseudo-halftone processing, the occurrence of unevenness in the density in the recorded image is suppressed. For that purpose, when recording a pseudo-halftone image using dot patterns, a dot-pattern table storing a plurality of different dot patterns is provided for each gradation value. One dot-pattern table is selected from N dot-pattern tables based on gradation-value information for each pixel. One dot pattern is selected from the selected dot-pattern table, based on position information indicated by the pixel, and recording is performed using the selected dot pattern. It is thereby possible to prevent the concentrated use of a particular nozzle of a recording head, and suppress the occurrence of unevenness in the density due to characteristics of the specific nozzle.
摘要:
A contamination of a printing medium caused by ink mist or the like is suppressed, which may scatter or float in an apparatus when margin-less printing is carried out in an ink jet printer. When margin-less printing for an edge of a printing medium P is performed, a predetermined edge area {circle around (4)} is printed using a smaller number of ejection openings during one scanning operation than that used for other areas {circle around (2)} and {circle around (3)}, while taking transportation errors relating to this end into consideration. This reduces the amount of ink mist resulting from ink ejected out of the edge of the printing medium during one scanning operation.
摘要:
In an apparatus for performing printing using a color ink-jet head having a plurality of ink-discharge-port strings corresponding to ink materials having different color tones, a high-quality image having excellent gradation can be recorded, while reducing the cost of the apparatus and increasing the data processing speed by reducing the capacity of a memory for storing dot arrangement patterns. For that purpose, as a plurality of dot arrangement patterns for determining dot arrangement at output within a M×N-dot region for one input pixel, (1) patterns having a large number of gradation levels that can be represented (for example, nine gradation levels) and a high recording resolution (for example, 1,200 dpi (dots per inch)×2,400 dpi) are used for colors in which uneven stripes tend to be pronouncedly observed (for example, light cyan and light magenta), and (2) patterns having a small number of gradation levels that can be represented (for example, five gradation levels) and a low recording resolution (for example, 1,200 dpi×1,200 dpi) are used for colors in which uneven stripes tend to be less pronouncedly observed (for example, black, cyan, magenta and yellow).