Dynamic Grayscale Table Adjustment for Printing Color Saturation
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Solution Overview
Problem
Existing printing technologies struggle to achieve high grayscale accuracy and color saturation control, particularly when printing images with varying densities, as they rely on pre-defined lookup tables that limit flexibility and accuracy in reproducing image data.
Innovation Solution
A printing apparatus and method that adjusts the grayscale range of the table based on the density range of the input image data, allowing for enhanced color saturation resolution by modifying the correspondence between grayscale values and ink amounts, and includes a density designation receiving section to customize the printing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pre-defined lookup table is used for converting grayscale values to ink amounts, then the printing process is simple and fast, but the grayscale accuracy and color saturation control are limited
Solution Approach 1:
The patent implements dynamic adjustment of the lookup table's grayscale range based on the density range of the input image. The obtaining section determines the density range, and the adjustment section modifies the grayscale range accordingly, transforming a static table into a dynamic one that adapts to different printing requirements, thereby improving grayscale accuracy without requiring multiple fixed tables
Solution Approach 2:
The patent changes the parameter of grayscale range in the lookup table based on the density range of the input image. By obtaining the density range first and then adjusting the grayscale range parameter accordingly, the system achieves variable grayscale accuracy that matches the actual printing needs, resolving the contradiction between fixed table simplicity and adaptive precision
2Productivity
If the grayscale range is fixed in the lookup table, then the printing process is efficient, but the color saturation resolution cannot be enhanced for different density ranges
Solution Approach 1:
The system dynamically adjusts the grayscale range of the lookup table based on the obtained density range, allowing the printing process to maintain efficiency while adapting the color saturation resolution to the specific requirements of each image, thus resolving the contradiction between fixed efficiency and variable precision
3Measurement precision
If a single lookup table is used for all density ranges, then the device complexity is low, but the density control accuracy varies across different image densities
Solution Approach 1:
The patent applies local quality by adjusting the grayscale range of the lookup table specifically for the density range that is actually present in the input image. Instead of using different tables for different density ranges, the system modifies the relevant portion of the single table, achieving localized precision improvement without global complexity
Solution Approach 2:
The dynamic adjustment of the grayscale range based on the obtained density range allows the single lookup table to provide different levels of precision for different density regions, maintaining device simplicity while achieving variable density control accuracy across different image characteristics
Data Source
AI summary
There is provided a printing apparatus which is configured to control a basic color in performing the basic color in a printing medium. The printing apparatus includes: a table in which a correspondence relationship between a grayscale value in image data of the basic color and a color material amount is defined; an obtaining section which is configured to obtain a density range of a color which is to be printed on the basis of the image data of the basic color; and an adjustment section which is configured to adjust a grayscale range of the table so that the grayscale value corresponding to a color material amount range which corresponds to the density range of the color is increased.