Document Conversion Graphic Element Transparency Blending
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Solution Overview
Problem
Existing methods for processing documents with overlapping graphic elements are complex and result in significant color shifts in overlapped areas during color matching, leading to undesirable hue changes in printed documents.
Innovation Solution
The method involves replacing graphic elements configured to overprint with pairs of replacement elements, one configured for lighten transparency blending to reveal background colorants and another for darken transparency blending to preserve the original colorants, allowing for accurate color matching and combination of colors in overlapped areas, while also handling spot colors and transparent elements through specific blending modes and grouping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If graphic elements are replaced with pairs of replacement elements having different transparency blending modes, then color accuracy in overlapped areas is improved, but device complexity increases
Solution Approach 1:
Each overprinting graphic element is segmented into two separate replacement elements: one with lighten transparency blending mode to preserve background colorants, and another with darken mode to preserve the original element's colorants. This segmentation allows independent control of colorant visibility in overlapped areas, achieving accurate color reproduction while managing complexity through systematic decomposition.
2Measurement precision
If color matching processing is applied to documents with overlapping elements, then color space accuracy is improved, but processing time increases
Solution Approach 1:
The patent applies color matching processing during the initial conversion from native to portable format, rather than as a separate subsequent step. By performing color space transformation and overprint simulation concurrently with the graphic element replacement process, the system achieves accurate color space representation without adding significant processing time overhead.
Data Source
AI summary
A printing system includes a converter for replacing graphic elements of a color matched document (104). Conversion replaces original elements (2-4) with replacement elements (21-24, 40-42) having modified transparency attributes so that overprinting elements that overlap areas (10-15) appear as intended when subjected to color matching.