Quality inspection systems enable proofreaders to compare Master and Sample files, both digital and printed, to automatically detect any differences between the two. These side-by-side comparisons work by overlaying two files to pick up even the smallest of errors with pinpoint precision. Built for use along the entire quality control process, quality inspection systems can be implemented across multiple departments to compare content at every stage of the workflow. This allows proofreaders and other quality control professionals to ensure that no errors have been created as files move from one stage to the next. Printer proofs, for example, can be compared to original PDF files to avoid conversion errors. Next, plate files can be inspected to ensure that no changes were introduced during the stepping and separation process. Finally, proofreaders can confirm that prepress files are error-free and ready to be printed before being sent to the customer. These systems also enable the inspection of digital files against printed components to ensure that final packaging matches the original approved artwork.