Color Conversion Information Generation for Gradient Accuracy
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Solution Overview
Problem
Existing color conversion techniques for printing color-gradient images suffer from reduced color reproduction accuracy due to the adjustment of conversion information, which affects the range of colors that can be expressed by the printer.
Innovation Solution
A method for generating color conversion information that involves accepting colors in a first color space, generating intermediate points on a line segment connecting two colors, converting these points between color spaces, and adjusting output values to enhance color reproduction accuracy, using a system that includes a host device, display device, color measurement device, and printer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conversion information is adjusted to accurately convert device-independent color into device-dependent color for color-gradient images, then color conversion accuracy is improved, but the color reproduction accuracy and the range of colors that can be expressed by the printer deteriorate
Solution Approach 1:
The patent segments the color conversion process into multiple stages: initial conversion using first conversion information, adjustment value calculation, and final conversion using modified conversion information. This segmentation allows the system to handle color-gradient images differently from spot colors, applying adjustments only where needed to preserve color reproduction accuracy while maintaining conversion accuracy for gradient smoothness.
Solution Approach 2:
The patent applies adjustment values locally to specific color regions. By calculating adjustment values based on the difference between converted colors and actual printer output, and applying these adjustments selectively to intermediate points on color gradients, the system preserves accurate color reproduction for spot colors while enabling smooth gradients without compromising overall color accuracy.
2Stability of the object's composition
If conversion information is adjusted to achieve smooth color gradients, then the visual quality of color-gradient images is improved, but the accuracy of color reproduction for device-dependent colors deteriorates
Solution Approach 1:
The patent introduces dynamic adjustment values that are calculated based on the specific characteristics of the printer and the color conversion requirements. These adjustment values are not fixed but are determined through measurement and calculation processes, allowing the system to adaptively optimize both gradient smoothness and color reproduction accuracy for different printing conditions.
Solution Approach 2:
The patent modifies conversion parameters by introducing adjustment values that are added to or subtracted from the converted color values. This parameter change approach allows the system to fine-tune the conversion process, correcting deviations in color reproduction while maintaining the smoothness of color gradients through controlled modifications to the conversion output.
Data Source
AI summary
A color conversion information generation device generates one or a plurality of intermediate points located on a first line segment connecting a first coordinate value representing a first color in a first color space and a second coordinate value representing a second color, in such a way that a number of intermediate points included in each of a plurality of reference spaces corresponding to a plurality of reference points is one or fewer. The color conversion information generation device generates modified conversion information in such a way that, when a coordinate value on the first line segment is converted into a coordinate value in a second color space by the modified conversion information, the coordinate value resulting from the conversion reflects one of a first adjustment value, a second adjustment value, and a third adjustment value. The color conversion information generation device generates color conversion information for converting a fourth coordinate value on the first line segment generated based on an operation by a user, into a coordinate value in the second color space, based on the modified conversion information.