Modifying Color Planes to Prevent Halo Bleed in Printing
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Solution Overview
Problem
In printing processes, background print agents can bleed and cause unintended 'halo' effects, especially when applied on substrates with high coverage levels, leading to image quality issues and visibility of the background around image edges.
Innovation Solution
A method that selectively modifies the background and image print agent color planes near coincident edges by eroding or dilating pixels to compensate for bleed, ensuring the background print agent does not spread beyond intended borders and preserving image quality by maintaining a minimum coverage and continuousness of printing areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If background print agent is applied with high coverage level, then background coverage is improved, but halo effect increases
Solution Approach 1:
The patent applies different processing to different regions of the background color plane. Edges coincident with image color planes are eroded to prevent halo effects, while non-coincident regions maintain full background coverage. This local differentiation allows high overall coverage while eliminating problematic edge halos.
Solution Approach 2:
The patent performs erosion on the background color plane before printing to preemptively counteract the bleed effect. By removing background print agent pixels at edges before application, the patent prevents the halo effect from occurring in the first place, rather than attempting to correct it after printing.
2Manufacturing precision
If background print agent is applied to compensate for substrate color, then image quality is improved, but background bleed increases
Solution Approach 1:
The patent selectively applies background print agent only where needed - in regions where the substrate color would otherwise show through - while avoiding application at edges coincident with image color planes. This localized approach maintains image quality without causing background bleed.
Solution Approach 2:
The patent identifies and processes the background color plane before printing by eroding edges that would cause bleed. This preliminary modification ensures that when background print agent is applied, it remains contained within intended boundaries and does not bleed into image areas.
3Object-generated harmful factors
If erosion is applied to background color plane, then halo effect is reduced, but background coverage is lost
Solution Approach 1:
The patent applies erosion only to specific regions of the background color plane - namely edges that are coincident with image color planes - while leaving other regions untouched. This selective erosion removes halos at critical boundaries while preserving background coverage in non-critical areas.
Solution Approach 2:
The patent applies partial erosion rather than complete erosion of the background color plane. By eroding only the portions necessary to prevent halo effects at image boundaries, the patent achieves sufficient action to eliminate halos without excessive removal of background coverage.
Data Source
AI summary
In examples, a method includes receiving print image data representing an image to be printed and selectively modifying at least one of an initial background print agent color plane and an initial image print agent color plane to determine a modified color plane.