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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.
The Kodak Approval proofing system was introduced in the 90s by Kodak in the market. With a Kodak Approval system outstandingly accurate halftone proofs and production Dummies could be produced.
Due to the high cost of consumables (market prices for Kodak Approval proofs are up to 100 Euro / A3 sheet) and the long processing time in the proofer and the elaborate laminating of the the proofs, Kodak Approval system are now only rarely found in the market. They were replaced by the faster, cheaper and in the color rendering significantly better and more accurate inkjet proofing systems.