The original of the packaging bag is the basis for plate making and printing. The quality of the original directly affects the quality of the printed matter. Therefore, it is necessary to select and design the original manuscript suitable for printing. The tone of the original should remain as constant as possible throughout the printing and copying process. Originals include reflective originals, transmission originals, and electronic originals. Each original is photographed, drawn, lined, and continuously adjusted according to the production method and image characteristics. Photo-reverse ray manuscripts: manuscripts that use opaque materials as carriers to form pictures and texts with black and white or colored lines. Reflective Continuous Original: An original that uses an opaque material as a carrier and gradually changes in tonal value. Transmission manuscript: manuscript printing with transparent material as the carrier of graphic information.
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