Application Analysis of Color Proof (Part 2)

* The digital combination of the same sheet number and the same sheet directly from the digitized page file (electronic mechanism) does not produce a film. The quality of digital proofing equipment has been improved to the extent that many types of equipment can be used to make the same sheet. As the printing industry moves closer to the “no film” workflow, some manufacturers are producing digital proofing devices that can match analog systems and can fully simulate the effects of halftone dots. Digital systems have some well-known benefits, including savings in time, materials, and workload, and the use of equally accurate digital information in process design, proofing, and platemaking steps.

Regardless of the font problem, a digital color proof for the same sheet must have some common features of the printing process so as to simulate the appearance of the printed proofs. The manufacturer is responsible for providing a control system to make the matching process easier to implement. Users are ultimately responsible for ensuring the implementation of matching purposes. The stability of the digital proofing system lies in the regular precision calibration and the use of color bar control strips for every single sheet. Digital color proofs should also be accompanied by a name identifying the product used for proofing.

Digital proofing has had some problems in the entire printing industry. The most important of these are:

Can digital proofs achieve the same effect as analog ones?
* Is the customer's request satisfied with digital proofs as compared to the final printed proofs?

To answer this question, we must consider the following variables:

* RIP
Will the RIP of the digital proofer interpret the file in the same way as the RIP output from the digital plate? What is the best form of RIP to use: software or hardware? Hardware RIP is often not considered because the usage environment is generally fixed compared to software RIP that can be used for multiple device states.

* File Formats Many times, many error codes appear in the RIP process due to incorrect or complex nested files. The latest RIP has the ability to handle a variety of file formats, including an accompanying PDF format.

* Many digital proofing technologies at outlets and non-networks do not produce proofs with separate outlets. These digital systems can produce halftone proofs, but when forming images on a plate, dots with precise dimensions or shapes cannot be produced, and there is no precise point of view. Because of these unfavorable factors, most digital proofing systems cannot predict the problem of imagery, the problem of moiré, and the resolution of dot and dot shapes present on the plate. In some cases, offline proofs (digital proofs and mock proofs) cannot predict the outcome of these problems simply because of their limited resolution.

* Hue matching The color range of different proofing technologies, or color gamut and printing process, can overlap each other, but often does not match. The color gamut produced by the proofing device, or technology, often falls outside the color gamut that the printing four-color replication process may replicate. The color management tool predicts the color of various output media is an important factor. Many technical improvements in color management and calibration tools have greatly facilitated the ability of digital proofing equipment to export high quality sample contracts. For more details, see the chapter on color management.

* The hottest topic in remote digital proofing is the ability to send digital files to a remote site for proofing or remote proofing. Successful remote proofing requires three basic conditions:

1) From point A to point B, transfer files.
2) Reliable and stable proofing system
3) Control methods for calibrating and predicting color accuracy on remote websites.
Remote digital proofing requires general user research and implementation and may be a complex process. Some manufacturers are providing solutions to complete remote proofing. Their direction is to provide users with such a solution: All problems are handled by a company that will act as an intermediary between the customer and several potential service providers. And the role of contact.

(IV) Local Color Proofing When proofing mixed colors, whether digital proofing or mock proofing, you must understand the relevant change factors. Some manufacturers provide users with one-page page chromatography, and they themselves have a color mixing system that produces four-color overprints or spot colors. However, we must know that these chromatograms generally have a short lifetime, because the color of the ink or paper will fade over time. If we choose a color on a computer screen, remember that colors should appear in the form of RGB instead of CMYK or solid colors, and premixed inks appear in the form. Attach a tear-off color patch to the job. The use of primary colors to simulate mixed colors mainly takes into account the changing factors of the inline printing presses and general printing presses. In this way, the mixed color at a certain position on the proof may not exactly match with other positions. In other words, the effect of tone reproduction of some off-line proofs will be different from that of the press proofs, so that a unique mixed color will have the same color feeling. Another factor that needs to be considered is paper. The image may be proofed on a different substrate than the printer's paper. For more information, see the Local Color Ink section.

Remember that when you organize your pages, color proofs are a means of communication, so no matter what kind of changes the proofs have, the purpose of proofs is to avoid mistakes that may cause expensive waste. The observation of proofs should be controlled under a 5000K light source.