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FLEXO Magazine : July 2009
DESIGN 2.4 Types of Proofs All parties involved with a project must agree upon the process and terminology used to evaluate and communicate the design – including color. Specifically, every proof created throughout the workflow should be clearly labeled to communicate: The purpose of the proof, The system or device on which it was created, Whether the output device was profiled and which profile was used, and The proof’s suitability for judging color. Types of Proofs Concept Proof: The concept proof is common in the early creative stages of the project. It is used to capture input from all partners in the supply chain during initial design development and is also referred to as a “collaborative proof”. This proof is typically not color profiled and, therefore, not used for matching color. Color Target Proof: The color target proof is often the selected “concept proof” . It represents the ideal color intent of the designer and client, independent of the print process or the ability of an individual press to achieve that color. Some of the color in this proof may not be achievable in the final print. To avoid rework costs and unachievable expectations downstream, it is helpful, when possible, to produce this proof based upon the known or expected capabilities and color gamut of the anticipated printing process(es). Comprehensive Proof (Comp)/Mock Up: The comp is formed to the shape of the final product and should indicate whether or not it is color accurate. Profiled Contract Proof: This represents what the customer is expecting to receive off press. The profiled contract proof represents the clients full content and color expectations. Printers or prepress providers use a Color Managment System or (CMS) and a characterization target printed on the intended press, to develop a ICC profile for the intended proofing device. Color Management Systems are a collection of software tools that quantify and reconcile the differences among monitors, proofers and printing presses. The contract proof does not have to be a dot-for-dot reproduction, but it must be an overall visual simulation of the expected print results. Therefore, it must simulate the dot gain, color attributes, detail, and contrast of the printed image. It must also contain a control target that is processed and imaged as part of the proof. The control target is used to verify accuracy and consistency throughout the design, proofing, and printing process. It must contain specific screen values, which should be determined with the printer, for all colors printing dots (including vignettes). Although most digital proofing devices may not reproduce a conventional dot pattern, the tonal scales should be measured using a densitometer (or spectrodensitometer) in the dot area function. Each one of the tonal scales must equal the weight (dot area) identified by the press profile. Before a contract proof can be accurately used, the entire reproduction system must be characterized so that the proofing system is calibrated to match the printed result. Afterward, both press and proofing systems must be maintained for consistency and repeatability. R. VanHandel 2.4a: Profiled Contract Proof: The contract proof must include a control target as well as template layout markings.
Sustainable Spring 2009