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Image forming device 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: 2019-07-05
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Image forming device and color conversion control method
  • Image forming device and color conversion control method

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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

Provided are an image forming apparatus capable of creating / correcting a scanner profile and appropriately estimating a colorimetric value, and a color conversion control method. The image forming apparatus prints a first color chart in which color patches of a first size are arranged in a common reading area and color patches of a second size are arranged in a scanner reading area, using a built-in scanner and an external colorimeter Obtain the RGB values ​​and color measurement values ​​of all the color patches, use the RGB values ​​and color measurement values ​​of the color patches in the second area to create a scanner profile, and print the second color in which at least the color patches of the first size are arranged in the common reading area Figure, using the built-in scanner and built-in colorimeter to obtain the RGB value and color measurement value of the color scale in the first area, based on the RGB value and color measurement value of the color scale in the first area of ​​the pre-saved first color map, and the second The RGB values ​​and the colorimetric value of the color patch in the first area of ​​the color map are used to calculate the correction amount of the colorimetric value used for estimating the colorimetric value 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 Patents(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