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Color processing method and apparatus

A processing method and technology of processing equipment, applied in the field of color processing, can solve problems such as color burnout, color change, etc.

Inactive Publication Date: 2007-02-07
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, this method poses a problem that if the output device and the printing medium change, the color to be reproduced changes
However, when the colorimetric matching area of ​​the red area is set to have the same area as the colorimetric matching area of ​​the green area, the color burnt out stands out

Method used

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  • Color processing method and apparatus
  • Color processing method and apparatus
  • Color processing method and apparatus

Examples

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no. 1 example

[0055] First, a method of adaptively setting a colorimetric matching area according to a color will be described. In the first embodiment, the colorimetric matching area is determined by narrowing the color gamut of the output device.

[0056] Figure 9 is a flowchart illustrating the adaptive setup sequence for colorimetrically matching regions according to color and mapping. This processing is performed by the image processor 208 .

[0057] A control point (S1) for reducing (distorting) the printer gamut is set with reference to the printer gamut. The sRGB color space and the printer color gamut are divided in advance by predetermined grid points, and the data of the grid points are represented by the CIELab color system. When each color gamut is represented by discrete grid points and the remaining regions are joined by linear interpolation, they can be analyzed as a continuous color space. The method of setting the control point is described below. Note that each cont...

no. 2 example

[0099] The color processing according to the second embodiment of the present invention is described below. Note that the same reference numerals in the second embodiment denote the same parts as in the first embodiment, and a detailed description thereof is omitted.

[0100] As a second embodiment, a user interface of an image processing device (color processing device) that performs the above-described color processing will be described below. As in the first embodiment, an example will be described in which the high-brightness control point GL in the green area which is the basic color of the sRGB color space is set High and set the reduction ratio=70% at the other control points to set a wider colorimetric matching area for the high brightness green area.

[0101] Figure 10 An example of a UI for setting the reduction ratio of all control points, that is, a graphical user interface displayed on the image display device 203 by the image processor 208 is shown. Although ...

no. 3 example

[0114] Color processing according to a third embodiment of the present invention is described below. Note that the same reference numerals in the third embodiment denote the same parts as those in the first and second embodiments, and detailed description thereof will be omitted.

[0115] Users often wish to set the area of ​​the colorimetric matching area according to the type and printing quality of the printing medium and the application of the printed object. As a third embodiment, the setting of the contrast color matching area when the types of printing media are different will be described below.

[0116] Inkjet printers are capable of printing on paper such as plain paper, matte paper, specialty photo paper, and the like. The color gamut of these printing papers widens in the order of plain paper, matte paper, and specialty photo paper. For this reason, since saturation and lightness drop as a result of mapping, the color difference in high lightness and high saturat...

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Abstract

In order to implement satisfactory color reproduction which effectively uses the gamut of an output device without causing any tone burning-out in only a specific gamut, a gamut that can attain colorimetrically approximate mapping must be set in consideration of the characteristics of colors and gamuts. Hence, upon converting a first gamut onto a second gamut, a third gamut having a shape according to the characteristics of the color or gamut is set inside the second gamut. The first gamut included in the third gamut is mapped onto the second gamut which is colorimetrical matching or approximate to the first gamut. The first gamut outside the third gamut is mapped onto the second gamut outside the third gamut.

Description

technical field [0001] The invention relates to color processing for converting a first color gamut to a second color gamut. Background technique [0002] In recent years, digital imaging devices, such as digital cameras, image scanners, etc., have become popular and can easily acquire digital images. On the other hand, full-color hard copy technology is developing at a rapid pace. In particular, printing using an inkjet system can ensure print image quality comparable to that of silver halide photographs, and is commonly used. Networks such as the Internet have become popular, and many users are in environments where various devices can be connected to the network. In such an environment with various input and output devices there are many opportunities to input and output color image data between devices with different color gamuts. For example, a hard copy of a color image on a monitor with a wide color gamut is made by a printer with a different color gamut. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/56
CPCH04N1/6058
Inventor 堀亚由美
Owner CANON KK
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