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Color changing device and color changing method

A color conversion and color coding technology, applied in the field of color conversion, can solve the problems of the color conversion accuracy of scanner profiles and other problems, and achieve the effect of improving the accuracy

Active Publication Date: 2019-07-19
KONICA MINOLTA INC
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, if the configuration of the scanner profile creation chart and other charts is different (the color and size of each color patch), the flare level will change when measuring the scanner profile creation chart and other charts. The accuracy of the color transformation of the file is reduced

Method used

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  • Color changing device and color changing method
  • Color changing device and color changing method
  • Color changing device and color changing method

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Experimental program
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Embodiment Construction

[0061] As shown in the background art, by using a scanner and a colorimeter to measure the scanner profile creation chart output by the printer, the RGB values ​​​​measured with the scanner and L*a*b measured with the colorimeter Colorimetric values ​​such as * values ​​are associated to create a scanner profile, and by using the created scanner profile, RGB values ​​obtained by measuring printer status acquisition charts and other charts with a scanner can be converted into L*a *b* value is equal to the color measurement value.

[0062] However, when measuring a chart with color patches arranged with a scanner, the degree of diffuse light (flare level) from the surrounding patches changes depending on the color and size of the surrounding patches, so if the scanner profile creation chart and other charts If the configurations are different, the flare level changes when both graphs are measured, and the accuracy of color conversion using the scanner profile decreases.

[0063...

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Abstract

To provide a color conversion device and a color conversion method capable of appropriately correcting the flare level and improving the accuracy of color conversion even when measuring a chart having a different configuration from the scanner profile creation chart. The color conversion device acquires a scanner profile that correlates the RGB values ​​obtained by measuring the color scales of the first color chart printed by the printer with the colorimetric values, based on the RGB values ​​of the respective color scales of the first color chart and the first color chart. The RGB value of each color patch in the predetermined chart created by changing the RGB value of a part of the color patch or the color patch size is created, and a table is created that correlates the RGB value difference and the color patch size difference with the correction amount of the RGB value corresponding to the flare level, Referring to the created table, correct the RGB values ​​obtained by measuring each color patch of the second color chart whose RGB value or color patch size is different from that of the first color chart, and refer to the scanner profile to convert the corrected RGB values ​​to Convert to colorimetric values.

Description

technical field [0001] The present invention relates to a color conversion device and a color conversion method, and more particularly, to a color conversion device that corrects a measured value of a chart in consideration of a flare level, and performs color conversion, and a color conversion method in the color conversion device. Background technique [0002] In devices such as scanners and printers, the device value (RGB value, CMYK value) output by the device is a device-dependent value, so create a color conversion table for converting the device value into a device-independent color (device profile), use the device profile for color transformation. As a method of creating the device profile, for example, in the case of creating a scanner profile, by measuring the scanner profile creation chart output by the printer with a scanner and a colorimeter, the measured value obtained by using the scanner is The RGB values ​​are correlated with colorimetric values ​​such as L...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/60G06F3/12
CPCH04N1/6033H04N1/6055H04N1/00045H04N1/047G06T7/90G06T2207/20224H04N1/6008H04N2201/0094
Inventor 山口岳志
Owner KONICA MINOLTA INC
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