Trap Graphic Generation for Shadow-Casting Objects
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Solution Overview
Problem
In the field of printing and plate making, the presence of a shadow-casting object in page data can prevent the generation of desired trap graphics, leading to exposed underlying portions during multicolor printing due to register movement.
Innovation Solution
An image processing apparatus and method that correlate each pixel with the topmost object under specific conditions, both generally and within the area of a translucent object, to generate trap graphics in boundary portions between overlapping objects, including those below a shadow-casting object, by employing a first correlation section for overall pixel correlation and a second correlation section for pixel correlation within the translucent object's area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a shadow-casting object is present in page data, then three-dimensional appearance is achieved, but trap graphics cannot be generated in the area of the shadow-casting object
Solution Approach 1:
The patent divides the correlation process into two separate sections: a first correlation section that correlates pixels with objects generally, and a second correlation section that specifically correlates pixels within the area of translucent objects. This segmentation allows the system to handle different regions differently, enabling trap graphic generation in areas that would otherwise be blocked by shadow-casting objects.
Solution Approach 2:
The patent applies different correlation rules to different regions of the image. Within the area of translucent objects, the second correlation section uses specific rules to correlate pixels with underlying objects, while other areas use the standard first correlation section rules. This local differentiation enables trap graphics to be generated in the translucent object areas without interfering with the three-dimensional appearance effect.
2Device complexity
If conventional ID drawing process is used, then processing is simple, but underlying portions are exposed during multicolor printing due to register movement
Solution Approach 1:
The patent performs correlation processing before the actual trap graphic generation. By pre-correlating pixels with objects in the area of translucent objects using the second correlation section, the system prepares the necessary positional relationship data in advance. This preliminary action enables accurate trap graphic generation that prevents underlying portion exposure during printing, while maintaining reasonable processing complexity through structured correlation steps.
Data Source
AI summary
For page data containing shadow-casting objects, trap graphics are generated according to the following procedure. First, an ID drawing process is performed for all objects within a page, and based on the process result, a related graphic list indicating relative positional relationships between the objects is generated. Thereafter, an ID drawing process is performed for all objects in the area of each shadow-casting object, excluding the shadow-casting object. The result of the ID drawing process in the shadow-casting object area is reflected in the related graphic list, and thereafter, trap graphics are generated based on settings information in the related graphic list.