Dynamic Color Material Limiting for Print Gamut Preservation
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Solution Overview
Problem
Existing signal conversion methods for print systems that limit the total amount of color materials used often result in an excessively narrowed color reproduction gamut, as they set a single limit value for all combinations of color materials, leading to print failures due to excess color material usage.
Innovation Solution
A signal conversion method that employs multiple input/output signal conversion processes with different limit values and weight definition information to dynamically adjust the total amount of color materials used based on the input vector, preventing excessive narrowing of the color reproduction gamut while avoiding print failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single limit value is set for the total amount of color materials used, then print failures caused by excess color material are prevented, but the color reproduction gamut is excessively narrowed
Solution Approach 1:
The patent applies dynamics by transitioning from a static single limit value to a dynamic limit value that changes based on the input signal characteristics. The limit value is determined according to the input vector, allowing the system to adapt the color material usage limit in real-time based on the specific color combination being processed, thus preventing print failures while preserving color reproduction gamut where appropriate
Solution Approach 2:
The patent changes the parameter of the limit value from a fixed constant to a variable that depends on the input signal. By determining the limit value based on the input vector (which represents the color combination), the system adjusts the parameter dynamically to match the specific printing conditions, resolving the contradiction between preventing excess material usage and maintaining color reproduction capability
2Object-affected harmful factors
If the limit value of total color material usage is reduced to prevent print failures, then excess color material is avoided, but the color reproduction gamut becomes narrower
Solution Approach 1:
The patent applies local quality by treating different color combinations differently rather than applying a uniform limit to all cases. The limit value is determined locally for each input vector, allowing higher limits for color combinations that are less prone to print failures and lower limits for combinations that are more problematic, thus preserving color reproduction gamut where safe while preventing failures where necessary
Data Source
AI summary
Provided are a signal conversion method and apparatus, a recording medium storing non-transitory program, and a print system which can prevent a color reproduction gamut from being excessively narrowed while avoiding a print failure caused by excess color material. A signal conversion method for limiting the total amount of color materials used in a printing device that forms an image on a recording medium using a plurality of color materials includes determining a final output vector after the total amount of color materials used is limited for an input vector, on the basis of a plurality of input/output signal conversion processes based on different limit values of the total amount of color materials used and weight definition information in which weights applied to the conversion results of the plurality of input/output signal conversion processes are determined according to the input vector.