Blueline An inexpensive photographic proof created prior to printing the full run of the image on a printing press. A blueline is created from a negative on which all the colors are blue (or possibly a different color) and shades of blue. Printing plate negatives are exposed to photosensitive paper to create the proof.
Blueline proofs are "contact proofs," so called because the creation process requires they come into contact with a specific kind of paper.
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