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IMAGE FORMING APPARATUS, and COLOR-CONVERSION CONTROL METHOD

A technology of the image and control part, which is applied in the direction of image communication, electrical recording technology using charge graphics, and equipment using electrical recording technology using charge graphics, which can solve problems such as poor accuracy

Active Publication Date: 2017-11-24
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Regarding the above-mentioned scanner profile, if the individual or part of the scanner is changed, or the type of paper used is changed, there will be a deviation in the correspondence relationship between RGB and colorimetric values, and the estimation of the colorimetric value using the scanner profile (Conversion from RGB values ​​to colorimetric values) Accuracy deteriorates

Method used

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  • IMAGE FORMING APPARATUS, and COLOR-CONVERSION CONTROL METHOD
  • IMAGE FORMING APPARATUS, and COLOR-CONVERSION CONTROL METHOD
  • IMAGE FORMING APPARATUS, and COLOR-CONVERSION CONTROL METHOD

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Experimental program
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Embodiment Construction

[0078] As shown in the background art, if the individual or part of the scanner is changed, or the type of paper used is changed, there will be a deviation in the corresponding relationship between the RGB and the color measurement value recorded in the scanner profile, so it is necessary to , Recreate the scanner profile for each paper type. However, in the method of recreating the scanner profile from the beginning, time and resources are wasted. In addition, it is also possible to calibrate the scanner profile by reading a color image with a built-in scanner and a built-in colorimeter at the time of scanner profile calibration, but in this method, the scanner profile and the scanner profile Differences in the patch size of the color image during calibration cause changes in the degree of influence (spot level) of reflected light from surrounding patches, so that the scanner profile cannot be properly corrected, and errors in estimated colorimetric values ​​increase.

[007...

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Abstract

An image forming apparatus includes a printing unit, an in-line colorimeter and an in-line scanner. A hardware processor is configured to control the printing unit, the in-line colorimeter and the in-line scanner, to perform the following operations. The hardware processor uses the printing unit to print a first color chart to be measured with the in-line scanner and an external colorimeter, and a second color chart to be measured with the in-line scanner and the in-line colorimeter. A hardware processor creates a scanner profile based on RGB values and colorimetric values of patches of the second size in the second area in the first color chart, and uses RGB values and colorimetric values of patches of the first size in the first area in each of the first and second color charts, to calculates correction amounts for use in estimation of colorimetric values by using the scanner profile.

Description

technical field [0001] The present invention relates to an image forming apparatus and a color conversion control method, and in particular to an image forming apparatus equipped with an in-line scanner and an in-line colorimeter, and an image forming apparatus for making / calibrating a scanner A color transformation control method for estimating colorimetric values ​​based on files. Background technique [0002] In devices such as scanners and printers, the device values ​​(RGB values, CMYK values) output by the devices become device-dependent values, so create a color conversion table for converting the device values ​​into device-independent colors (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, a scanner and a colorimeter measure a color chart (color chart) output from a printer, and the RGB color chart measured by the scanner is measured. Scanner profi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/00H04N1/60G03G15/01
CPCG03G15/01H04N1/00018H04N1/00023H04N1/60H04N1/6008H04N1/00323H04N1/6044H04N1/6019H04N2201/0094
Inventor 山口岳志
Owner KONICA MINOLTA INC