1. Prepress quality check
-- Text and image safety check.
-- Bleeds and cut lines check.
-- Size compability.
-- Resolution in 300 DPI.
-- Borders check.
-- Appropriate color options.
-- Eliminate double crop marks.
-- Eliminate key lines (holding lines)
-- Digital printing proof before mass production.
2. Check each paper sheet after printing
3. In-process QC inspection
4. Sampling inspection after finished packing
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