Corrugated cardboard is not a smooth coated paper stock. It has a textured and absorbent surface, which can slightly soften fine details, reduce colour vibrancy and create a more natural printed finish.
For best results, artwork should be supplied with the understanding that printed packaging will have a practical, industrial print finish, not the same high-gloss or backlit brightness seen on a digital screen. This is especially important for full-colour artwork, large solid colour areas and designs printed onto brown kraft board.