Method for generating color chart, color chart and a printer

A technology for printers and printers, which is applied in image communication, color signal processing circuits, electrical components, etc., and can solve problems such as not specifying color calibration methods

Inactive Publication Date: 2010-03-03
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That said, the document does not describe the actual color calibration method, e.g. a method of identifying fluctuations from the ideal state of the printer for color calibration purposes and a method of calculating parameters based on this fluctuation

Method used

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  • Method for generating color chart, color chart and a printer
  • Method for generating color chart, color chart and a printer
  • Method for generating color chart, color chart and a printer

Examples

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no. 1 example

[0082] Color Correction Unit 102 Functional Overview

[0083] figure 2 is for illustration figure 1 A block diagram of an abstract model of the purpose of the color correction unit 102 is shown. In this embodiment, the following settings are made for simplicity. That is, it is assumed that the image data is CIELab data which is a color in a device independent color space. Also, assume that the device color value sent to the color correction unit 102 and the device color value sent by the color correction unit 102 to the output processing unit 103 are CMY values ​​without any K magnitude, ie black ink data is not considered. However, those skilled in the art should understand that the image data may be other image data such as RGB data, and the color correction unit 102 may perform correction including the K value.

[0084] ideal printer model

[0085] figure 2 The upper part of is a block diagram representing an ideal printing system.

[0086] In this case, all La...

no. 2 example

[0132] In the first embodiment, for simplicity, both the device color value sent to the color correction unit 102 and the device color value sent from the color correction unit 102 to the output processing unit 103 are CMY values ​​without any K amount set.

[0133] However, if Figure 16 As shown, the color correction unit can be configured in the following manner to extend the correction results of only three colors, that is, the correction results of CMY colors to all CMYK colors, and in actual correction, the CMY correction unit only corrects the CMY value while maintaining the CMYK color The amount of K does not change. In this case, since the correction effect is good for gray, skin tones, and colors with high luminance levels, sufficient correction quality can be obtained.

[0134] When actually correcting four colors, that is, CMYK colors, the color correction unit may include four correction units to always correct three colors with higher application amounts, that i...

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PUM

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Abstract

The invention relates to a method for generating a color chart, a color chart and a printer. The method is provided for generating a color chart for a printer, which color chart comprises a pluralityof elements. The method comprises obtaining reference color data representing colors output by the printer, when the printer is in a reference state. Further, comparison color data representing colorsoutput by the printer, when the printer is in another state is obtained. Differences in color between corresponding elements of the reference color data and the comparison color data are determined and at least one region of the output color space of the printer is classified as a linear region in which the differences vary substantially linearly. The method includes selecting colors of the elements of the color chart on the basis of the linear region.

Description

technical field [0001] The invention relates to a method for generating a color chart, a color chart and a printer. Background technique [0002] Conventionally, for a color printer such as an electrophotographic printer using cyan (C), magenta (M), yellow (Y), black (K) color materials, calibration related to a target density set for each primary color is performed . [0003] However, conventional primary color calibration can correct primary colors, but cannot correct colors reproduced by combining CMYK colors such as gray and skin tones. For example, the primary color correction technique cannot handle other colors due to color fluctuations that occur due to changes in developing efficiency, fixing temperature, etc. caused by environmental factors or changes over time. [0004] In order to solve this problem, color calibration has been proposed (Japanese Patent Laid-Open No. 2007-089031). [0005] However, Japanese Patent Application Laid-Open No. 2007-089031 only desc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/60H04N1/04
CPCH04N1/6033H04N1/40006H04N9/67
Inventor 羽鸟和重笠原章宏
Owner CANON KK
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