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In print design and production, trapping is a critical process that ensures precise color registration, prevents white areas, and avoids registration errors, particularly for special colors such as black, gold, and white, which require specific trapping principles. This article systematically examines the trapping logic and methods for these three colors based on printing industry practices.  I. Trapping Principles for Special Colors (Black/Gold/Silver)  Due to their strong ink coverage and high visual prominence, black, gold, and silver require trapping techniques that balance color consistency with printing feasibility. The key principles are as follows:  1. **Color Expansion/Contraction**: Minor adjustments to avoid white areas. When black or gold blocks adjacent to other colors (e.g., colored ink), expand the surrounding areas by 0.5–1 mm. This addresses potential white gaps at edges caused by printing pressure or registration errors; expanding adjacent colors fills t...

Throughout the long history of the printing industry, plate-making technology has consistently served as the crucial link between digital design and final output. From early manual tracing to modern digital imaging, this process has undergone several revolutionary transformations. This article provides an in-depth analysis of film-based plate-making—a traditional core technique—and compares it with contemporary methods such as CTP (Computer-to-Plate), flexographic plate-making, and gravure plate-making, offering a comprehensive understanding of their technical principles, application scenarios, and respective advantages and disadvantages. I. Film Plate Making: The Fundamental Process of Traditional Printing 1. What is film plate making? Film plate making, also known as film-based plate making, is a core process in traditional printing. Its essence involves transferring digital graphic information from a laser typesetter to a photosensitive film, which is then transferred using a plate ...