Analysis of Factors Affecting Digital Proofing Effect

With the development of global digitalization, the emergence of digital technologies such as computer-to-plate (CTP) and computer-directed network (CTF) films has increased the demand for improved digital processes in the entire printing industry to replace the existing traditional production methods. The digital process involves a very wide range, among which the most important concerns are digital proofing. The industry was initially skeptical of digital proofing. It has gradually accepted and adopted today and has undergone several years of transition. If the equipment is good, the stability of digital proofing is not a problem; however, there are many factors that affect digital proofing. Until now, digital proofing is still necessary to be discussed and continued to improve.

â—† The digital proofer's sophisticated ink system and proofing paper?
â—† proofing software calibration method and color space corresponding limit?
â—†Evaluation Key: Correct interpretation, color, dot shape, resolution, angle?
â—† measuring instruments and color management software?
â—† pre-press system manufacturers color knowledge background and color correction ability?
â—† Observing environment and conditions such as color (metamerism)?
â—†Printer characteristics and ink color gamut?
â—† different printing plants and different brands of ink?
â—† What is the standard color â—† What are the international standards?

The above issues should be some of the problems encountered by the general industry. When doing digital proofing, the printer is a prerequisite, if the printer is not good, the effect is not ideal in the color management, affect the color gamut, so we must choose a good printer. The choice of ink is not the same. For example, if we use special colors, the ink should be different from the past. Different industries use ink in a selective manner. Many special colors cannot be printed by a printer. The only way to do this is to use ink. It is changing ink. Again, the paper used, we have been talking about the paper determines the color, if the paper quality is not good in the color gamut performance or want to make the color performance more accurate can not be done, so in this topic there are three key to have, Excellent printer, good ink system and proofing paper with good color rendering.

There are color cores in the proofing software, whether the CMM can achieve perfect conversion, and the limit of the color gamut conversion. It is related to the paper used. It is better to use coated paper, and it can be printed on molded paper. Unfortunately, using good paper to simulate a poor color gamut can actually be done.

The correctness, color, dot shape, resolution, and angle of the RIP are the same. The digital samples can do the above points at present, making it very similar to the printing point. The precision of the instrument and the calculation method of the color management, the previous color management has been doing well, because the software and the instrument are not good, so use a good software algorithm, the result is more accurate.

Observing environment and conditional color (metamerism), usually when doing color calibration, the observation environment is very important, because when viewed under a non-standard light source, the color is difficult to match. If the two colors have different spectral distributions (spectral reflectance curve, or spectral transmittance curve. This curve can be measured by the spectrometer), when under a certain lighting and observation conditions, the two colors will look the same if If the lighting and observation conditions are changed, the two colors will look different because they do not have the same tristimulus value. This phenomenon is called conditional isochromatic phenomenon or metamerism. Different printers use different printers and inks, and the masters of the printers will print different effects. This is the most difficult problem to improve.