This proof conforms to press proofing by constraining the gamut of the print to CMYK. Chromaworks uses HP's DesignJet 5500 along with HP's RC Satin Paper, and an Onyx Productionhouse RIP, to create SWOP Off-Press Proofs. Your PDF file must contain only CMYK data and comply with the PDF/X-1a file format standards to achieve accurate results. 'U.S. Web Coated (SWOP) V.2' is the output profile and destination.

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The SWOP® Review Committee has approved the use of off-press proofs as input material to publications. SWOP® specifications recommend that: "The appearance of an off-press proof used in this application must closely simulate a SWOP® press proof."

A Digital Proofing Control Bar, obtained from SWOP®, Inc. or created in-house, must be included on all proofs, in order for them to be considered acceptable SWOP® proofs. SWOP® specifies that a control guide such as the GATF/SWOP Proofing Bar be supplied on every off-press proof. SWOP® has made color bars meeting the above requirements available as a free download from its website www.swop.org.

SWOP has introduced a certification procedure and accompanying Certification Mark for off-press proofing systems. Manufacturers of off-press proofing systems must submit an Application Data Sheet (ADS) and representative proofs to SWOP, which then checks proofing systems submitted for certification against the supplied ADS to each system's visual match to a SWOP Certified Press Proof.