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Recording medium, scanner profile correction method, and printer

A technology of recording medium and calibration method, which is applied in the direction of instruments, calculations, electrical digital data processing, etc., can solve the problems of color accuracy degradation, scanner machine differences, etc., and achieve high-precision results

Active Publication Date: 2019-10-25
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When performing color conversion on device values ​​measured by a scanner using a scanner profile prepared in advance in the above procedure, use a reference chart prepared by offset printing when the printer is assembled Calibration that matches the reference state, but the difference in scanner machines (differences between machines with the same model but different batches) and the deterioration of color accuracy due to the influence of output paper

Method used

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  • Recording medium, scanner profile correction method, and printer
  • Recording medium, scanner profile correction method, and printer
  • Recording medium, scanner profile correction method, and printer

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Embodiment Construction

[0039] As shown in the background art, a scanner and a colorimeter are used to measure a color chart output by a printer, and the RGB values ​​measured by the scanner are associated with the color values ​​measured by the colorimeter, thereby making a simple scanner chart. files. Color values ​​(L*a*b* values ​​or XYZ values) for RGB values ​​at fixed intervals are associated with the scanner profile, and the device values ​​are converted into device-independent colors, enabling output of the desired image by the printer. color.

[0040] However, there are scanner machine differences between the actual output and the scanner profile creation, and the output paper is also different, so there is a deviation in the correspondence between the RGB value and the color value, and it is impossible for users who require high precision. Satisfactory accuracy, especially the deterioration of the accuracy inside the color gamut of the printer becomes a problem.

[0041] In addition, in ...

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Abstract

Provided are a computer-readable recording medium storing a scanner profile correction program, a scanner profile correction method, and a printer. The device in the printing system obtains and measures the scanner profile including the K patch group including the patches where K is 0%, and the gray patch group in which the CMY values ​​of the patches in the K patch group are set to approximately the same value The RGB value and color value obtained by correcting the color patch are read from the storage device into the pre-made scanner profile, and the correlation between each element of RGB and the lightness element of the color value is calculated for each K value, and according to The measured value of the color patch for scanner profile correction calculates the correlation between each element of RGB and the lightness element of the color value for each value of K, and calculates the value of RGB for each value of K based on the two calculated correlations. A correction table for each of R, G, and B for correcting the scanner profile is created based on the calculated difference of each element with respect to the lightness element of the color value.

Description

technical field [0001] The present invention relates to a computer-readable recording medium storing a scanner profile correction program, a scanner profile correction method, and a printer, and more particularly to a scanner profile correction storing a correction table for making a scanner profile correction A computer-readable recording medium of a program, a scanner profile calibration method, and a printer with an on-line scanner and an on-line colorimeter. Background technique [0002] In devices such as scanners and printers, the device values ​​(RGB values, CMYK values) output by the devices are device-dependent values, so create a color conversion table for converting the device values ​​into device-independent values (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 are used to measure a color chart (color chart) output f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/00H04N1/60
CPCH04N1/00023H04N1/00045H04N1/6027H04N1/6033H04N1/6044H04N1/00087G06F3/1208
Inventor 铃木直代
Owner KONICA MINOLTA INC