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Method for generating a color chart

An image processing device, ideal technology, applied in image communication, color signal processing circuits, electrical components, etc., to solve problems such as color calibration methods that are not specified

Inactive Publication Date: 2012-07-11
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 a color chart
  • Method for generating a color chart
  • Method for generating a color chart

Examples

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no. 1 example

[0083] Color Correction Unit 102 Functional Overview

[0084] 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 as colors 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.

[0085] ideal printer model

[0086] figure 2 The upper part of is a block diagram representing an ideal printing system.

[0087] In this case, all Lab value...

no. 2 example

[0133] 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.

[0134] 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.

[0135] 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

A method is provided for generating a color chart for a printer, which color chart comprises a plurality of 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 colors output 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

[0001] (This application is a divisional application of an application with an application date of August 27, 2009, an application number of 200910169637.2, and an invention titled "Method for Generating a Color Chart, a Color Chart, and a Printer".) technical field [0002] The invention relates to a method for generating a color chart, a color chart and a printer. Background technique [0003] 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 . [0004] 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...

Claims

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Application Information

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