Printing is widely used in life, no matter where most people will use printing. In the printing process, there are many factors affecting the printing effect, so the printing will first print out the sample and the proof for comparison, in case of error timely correction, to ensure the perfect print, paper lead future network to share the printing sample should pay attention to several requirements, content for friends reference: Printing sample is the most common method used to check and control the printing quality in the process of printing operation. Whether it is monochrome printing or color printing, the operator must often use his eyes to repeatedly compare the printing and proof, in order to find out the difference between the printing and proof, timely correction, to ensure the quality of printing products.