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A digital proof (correctly: contract proof) is an ISO 12647-7-certified testing device for the graphic arts industry. A digital proof simulates the colourfulness of offset printing or gravure printing in a colour and legally binding manner within the narrow tolerances of the ISO standard.
In the case of a dot proof, the halftone screening of the final print is simulated in the proof. This screening shows possible moiré or other disturbing effects, that by dot proofing can be seen in advance on the proof.