Digital proofing color reproduction method

According to the survey, people's concern about digital proofing in the market is mainly whether the digital proofing color can meet the requirements of printing, and the difference between the used paper and ink and the printing and use, and whether it can get the color reproduction effect consistent with printing. The ideology promoted people's distrust of digital proofing and increased the resistance of digital proofing promotion. In fact, through the improvement in recent years, the problem of digital proofing in color reproduction has been gradually overcome. Digital proofing has entered a new era.

The following describes the features of digital proof color reproduction from the three aspects of color reproduction performance, image resolution, and output proof color stability.

1. Color reproduction performance. The color reproduction performance includes the gradation range (also called contrast) of the image (including line text), the density or chromaticity of the solid or saturated color, gray balance, and the reproducibility of the level curve (including the brightness adjustment, midtone, and dark tone level reproduction And the dot gain rate reproduction) and delicate texture. In terms of color reproduction, most color proofing machines can express richer color gamuts than printing inks. Coupled with good color management software, digital proofing has powerful color reproduction capabilities, and the performance of color gamut can be very similar. print.

2. Image resolution. Digital proofing usually uses inkjet printing or laser printing technology, generally output is the FM network or continuous tone structure. Therefore, as long as there is output resolution of 600dpS or more, the proofs of the proof can achieve the effect of 150dps in the amplitude modulation network. In fact, the transmission and reproduction of outlets is not the main problem to be reflected in proofing. The reproduction of colors is the main purpose of proofing. Traditional printing checks the reproduction of printed dots, even without originals. Densitometers or magnifiers can also be used to monitor and control the dot and density. Therefore, there is no need to pursue the use of AM outlets in digital proofing.

3. Output sample color stability. The digital proofing system is sent directly from the digital page file to the proofing system. Before the proofs are output, all are controlled and transmitted by digital signals. Therefore, the output of the same electronic file is exactly the same when outputting. It can be said that digital proofing is almost unaffected by the environment, equipment, crafts, etc., and is not affected by the operator. Therefore, the color stability of the output proofs is ideal.