Editor's note: The successful implementation of color management not only requires printing companies to introduce advanced tools, but also requires users to have the ability to use and manage these companies.

People in the industry agree that the price / performance of the current proofing technology has been significantly improved than before. In the words of Martha Stewart: "This is a good thing." These changes have transformed proofing from an island-like analog process to a modern technology that can be integrated with all digital workflows. Proofing has penetrated into every step of the creative, pre-press and printing process we are using now.

Advances in technology have strengthened communication between people, but the successful implementation of color management requires not only the introduction of advanced tools by printing companies, but also the ability of users to use and manage these companies. The lack of any aspect will lead to the inconsistency of industry standards and the failure of color management in the proofing process. Although the concept of using a unified standard to verify proofs has been recognized by most people in the United States and European companies, and has been widely used, but a printing customer in Europe said: "Now there are 80% of the live work in When it was sent to the printing house, it was not equipped with qualified proofs, which is really unimaginable. A printing house is actually a manufacturing plant, which uses industrial processes to copy products that are consistent with the original, and the printing plant and the customer The only contract document between them is a signed proof. Just like no one will drive an uninsured car, you ca n’t start printing until you get a verified proof. ”

The purpose of proofing

In a specific production environment, the type of color management mainly depends on the location of the proofing and how it is used in the workflow. In the creative or design stage, the computer monitor can provide a degree of proofing for the designer. Next, the file inspection or pre-inspection software will "verify" the file. Although this may not be a proof in the traditional sense, it is indeed a proof. After the user checks whether the font in the file is correct, the high-resolution image is clear, and the page is regular, the file can be used for RIP output.

In the process of prepress processing, staff often need to quickly check the elements of the page with the help of rough proofs in order to correct the color of the proofs before sending them to the customer for inspection. Although the same sample and the original sample are generally produced on the same device, sometimes we can produce colors that are very close to the original on a color printer that is not prepared.

In the next workflow, the staff will use content or layout proofing to check the content and layout of each page. In this case, whether it is a color proof or a black and white laser proof, can meet the requirements of users.

Depending on the workflow and product, people may also use the same sheet in subsequent programs. This kind of proofing can be used as a contract document between the printing plant and the printing customer, making clear regulations on the final color and page content of the printed matter. After the customer can sign the sample, the printing plant can be officially put into production. In addition, the operator of the printing press also needs to use the same sheet as a reference to adjust the printing color.

Imposition proofing (formerly known as "blue line proofing") is mainly used to determine whether the proof meets the processing requirements of live parts, for example: front and back registration of double-sided printing, imposition sequence, folding, cutting and binding Wait. Historically, imposition proofing is also often used by people to make final corrections to copies and content.

For some important jobs, the printing house or printing buyer may still require the use of the proofs produced on the printing press, and even go to the workshop to conduct on-site inspections during the printing process. For example, a consumer product packaging company may confirm whether the printed page matches the previous product before signing.

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