The role of the proofs is to provide the printing shop with a reference guide for the customer's sample, indicating that the print shop should reproduce what kind of product through the same output film and electronic files.
SWOP's proofing characteristics can be determined using SWOP's Calibration Kit. The kit contains a set of model and color separation films for calibration. The SWOP Calibration Toolkit provides a set of SWOP specification parameters to the sample provider, the manufacturer and user of the proofing, and the printer, as a comparison and matching sample. The machine-specific feature data can be found in ANSI/CGATS TR 001, which provides a color management reference for the proofing device that optimizes the effects of visual color matching.
In rotary printing, the online page around the printing cylinder essentially receives the same amount of ink. In order to minimize the cost of printing preparation and to match the printed pages with the samples signed by the customer as much as possible, all provided materials must meet the same parameter standards and the proofs should be prepared with standard materials.
Machine type
Proofing material - paper
As early as the beginning of the SWOP, the objective of achieving the similarity between the appearance of the ink proofs and the printed products of the publications was established. Since proofing is usually performed on a sheet-fed printing press, the paper used in the proofing must have a certain degree of hardness and other mechanical properties so that it can be transferred between the grippers of the printing press and maintain a stable positioning accuracy.
At present, there is found a paper suitable for the printing of a printing press, No. 60 paper No. 72, No. 72 coated original wood pulp paper. Textweb proofing paper produced by Champion International was identified to meet the needs of SWOP proofing. (Note: Other papers that meet the same parameter requirements are also acceptable.)
Samples of Champion Textweb proofing paper were measured to give the following values. Color measurements are only briefly provided.
Densitometry - For reference only, the following Status T Absolute Density values ​​were measured on a representative sample of Champion Textweb proofing paper.
In addition to the paper described above, any other selected paper should be predicted on the press based on these parameter criteria. If the test results meet the conditions, they can be immediately submitted to GATF or the Chicago Paper Testing Laboratory (Address: 3356 Commercial Avenue, Northbrook, IL 60062-1909. Phone) to check their compliance with this parameter standard. degree. This service will charge a fee.