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GMG's ProofControl is Quality Control System

Proofs have ID numbers for customer records

Big Picture
GMG's ProofControl quality-control system documents every proof with a specific identification number, giving print providers a secure customer record of approved proofs. The ProofControl system consists of ColorProof software (color engine, profile editor/creator, Fogra Media Wedge, and RIP), a Gretag spectrophotometer, and output modules for various printing devices.

Using the included spectrophotometer, the Media Wedge is measured and the resultant values are compared with stored target values. For all proofs within tolerance, a small adhesive label is printed on a label printer, which is also sold as part of the ProofControl system. The label, which contains all relevant production information, is then placed on the back of each calibrated proof, marking the proof as having met color standards. (GMG: www.gmgcolor.com)

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