Color conversion apparatus and color conversion method

Abstract

Provided are a color conversion apparatus and a color conversion method to properly correct the level of flare occurring in measurement of a chart and thereby improves the accuracy of color conversion, even if the chart is different in composition from the chart for creating a scanner profile. The color conversion apparatus obtains a scanner profile in which measured RGB values and corresponding measured colorimetric values both given by measurement of patches in a first color chart printed by the printer are associated with each other, creates a table on a basis of RGB values of patches in the first color chart and RGB values of patches in a specific chart created by using a part of the patches in the first color chart with an RGB value or patch size being changed, wherein the table includes correction amounts of RGB values, each according to a level of flare estimated for a patch and each associated with an RGB-value difference and a patch-size difference, further corrects, by usingthe table, measured RGB values given by measurement of patches in a second color chart which is different from the first color chart in RGB values or patch size of at least a part of patches, to obtain corrected RGB values; and converts the corrected RGB values into colorimetric values by using the scanner profile.

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...

AI Technical Summary

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

Images