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1. standardised printing colours (process colours) for four-colour printing (CMYK), e.g. the Euroscale.
2. proof scale: A schematic ink sample that is produced during a press proof and serves as a basis for assessing a print in the production run.
In contrast to a proof, a press proof is created using films or CTP printing plates on special press proof machines with the same colours and parameters as the subsequent production print. Press proofs are rarely used today for cost reasons.