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Printer

A printing device and color printing technology, applied to typewriters, printing devices, printing, etc., can solve problems such as inability to obtain density and inability to fully perform correction processing

Inactive Publication Date: 2005-11-30
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since color image processing is performed in this case, correction processing cannot be fully performed during the occurrence of the expected problem, and sufficient density cannot be obtained

Method used

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Embodiment Construction

[0035] Embodiments of the present invention will be described below with reference to the accompanying drawings.

[0036] FIG. 5 shows the structure of a digital multi-function peripheral (MFP for short) 10 of the printing apparatus according to the present invention. This MFP 10 comprises: main CPU 1, is used for carrying out overall control; ROM 2, is used for storing the control program relevant to the present invention; RAM 3, is used for temporarily storing data; Hard Disk Drive (HDD) 4, is used for storing bitmap data, etc.; an operation panel 5; a scanner unit 6; an image processing unit 7 which performs image processing as hardware; a printer unit 8; and an interface (Interface, I / F) 9 connected to a personal computer (PC).

[0037] In the present invention having the above-described structure, the class of bitmap data is determined using the class of pixels and the number of pixels constituting the bitmap, and appropriate image processing is performed based on selecti...

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PUM

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Abstract

A main CPU analyzes a PDL that is sent via an interface on the basis of a program that is prestored in a ROM. If the kind of object is specified as a bit map, the main CPU converts the bit map data to an internal data format and counts pixels with respect to each pixel kind. Based on the count result, the main CPU determines an applicable pattern, switches a color conversion unit, switches a spatial filter process unit, switches a compression method process unit, switches a decompression method process unit, and switches a halftone pattern process unit. Further, the main CPU executes color determination for the bit map data, sets a monochromatic print or a color print in accordance with a color determination result, and transfers the resultant data as print data to a printer unit.

Description

technical field [0001] The present invention relates to a printing apparatus, such as a printer or a multifunction peripheral, for performing image processing to realize printing. Background technique [0002] Currently, most printers have a technology for obtaining optimum printing effects by switching color conversion processing, halftone patterns, etc., according to the type of object to be printed (text, graphics, bitmap). For example, in the case of text, increase the screen line count to enhance resolution and sharpen character edges. In the case of bitmap data such as photographs, instead of increasing the number of screen lines, emphasis is placed on smooth changes in tone color. [0003] As for blackening processing, in the case of text or graphics, as shown in FIG. 1, in many cases, black parts will be printed with a single black toner. In the case of bitmaps, printing with only black toner may result in an unnatural print effect, so mixed color printing is usual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J5/30B41J2/525G03G21/14G06T1/00G06T5/00H04N1/40H04N1/405H04N1/41H04N1/413H04N1/48H04N1/52H04N1/60
CPCH04N1/405H04N1/40H04N1/41H04N1/48
Inventor 萩原隆裕
Owner KK TOSHIBA
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