Views:2 Author:Site Editor Publish Time: 2019-02-28 Origin:Site
1. Color image reproduction performance
Color image reproduction performance includes the range of the tone of the image (including line text) (also known as contrast), the density or chromaticity of the solid or saturated color, the gray balance, and the reduction of the gradation curve (including the bright, middle, and dark levels). Reproduction and dot enlargement rate reproduction, delicate texture, and the like.Screen printing machine
Regardless of the color management software, the ICC format data is obtained by measuring the standard file color block to be printed and the standard file color block of the printer, and the color calibration system software is used to calculate the characteristic calibration file required for the proofing process. Profile. In this way, all the page image files to be proofed (including the data after the RIP of the PS and TIFF format files) can be output to the digital proofing system, and the proof proofs matching the subsequent prints can be output. No matter what kind of paper is printed (such as coated paper, offset paper or newsprint, or even plastic, cardboard, etc.), what series of inks, digital proofing system can simulate. If there are still slight differences in the quality of proofing of various digital proofing systems, this mainly reflects the performance difference of the color management software they are equipped with.
The traditional proofing technology, because the proofing machine is different from the actual printing in terms of speed, pressure and imprinting, it is difficult to simulate the actual printing in the traditional proofing. It is difficult to catch up with the traditional proofing effect, and the digital proofing proof is actually In use, printer operators generally feel that it is easier to simulate, because the color difference between digital proofing and printing in the entire color space is smaller than that between traditional proofing and printing.
2. Image Resolution
Since the digital proofing system usually adopts inkjet printing or laser printing technology, the general output is a frequency modulation dot or a continuous tone structure, so as long as the output resolution is more than 600 dpi, the sample proofing can achieve the effect of 150 lpi of the amplitude modulation dot. Most color printers now achieve this image resolution.
The RIP of the new generation digital proofing system can output AM dots that are consistent with the actual printing results, so the printer is required to have higher resolution. At present, EPSON inkjet printer output resolution is up to 2880dpi, HP inkjet printer can reach up to 2400dpi, and the AM-format image with the same output and actual resolution is no problem. Of course, from the perspective of the actual dot structure, there is no clear printed dot on the edge of the dot on the sample, but the microscopic difference is not visible with the mesh. What people need is that the visual resolution of the entire image is the same as the printing.
Traditional proofing may result in a decrease in image sharpness due to inaccurate overprinting, and digital proofing does not have the problem of overprinting.
3. Stability and consistency of proof output
There is no doubt that since the digital proofing system is sent directly from the digital page file to the proofing system, all digital signals are controlled and transmitted before the sample is output, so whenever the output is even if the time is several weeks, months or even years, The effect of the same electronic file output is exactly the same. Of course, the premise of this stability is the color printer hardware performance, such as inkjet ink drop size, ink and printing, I can keep consistent.
For traditional offset proofing technology, in addition to paper, ink, PS plate should be stable (actually very difficult) and the state of mechanical proofing equipment (such as plate pressure, paper table pressure, blanket and pad height, water roller And the pressure of the ink roller, etc.) should be kept normal, the effect of the traditional proofing is also affected by environmental conditions (temperature, humidity), Murray. The influence of the quantity and its uniformity, the balance of ink and water, etc., the density of the connected samples can not be consistent during the proofing process, not to mention the level of the operator.
Compared with traditional proofing, digital proofing is almost independent of the environment, equipment, technology, etc., and is not affected by the operator. Its stability and consistency are ideal. Therefore, the digital proofing system is used as a network proofing device, that is, people. People can use the digital proofing system to output proofs.
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