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