¡¡¡¡In recent years, the hybrid and network and secondary FM screening technology is widely used, however, they have the characteristics of high precision, so the corresponding to before printing, plate-making and printing process also have specific requirements, otherwise the printing quality to meet the expectation effect, even maybe some ways than the traditional 200 lpi of amplitude modulation and network quality, so if the user use the high-end and network printing, production, must pay attention to the following items:
¡¡¡¡1.Image quality.
¡¡¡¡Image quality requirements of gradual transitional normal, high color saturation and clarity, must avoid the use of insufficient information of the low resolution images and order level loss and grade and severe, color and clarity abnormal inferior image, etc. Because if the image quality defects, hybrid and network and secondary FM screening will not only turn eight consecutive images of these defects when halftone to amplification, coupled with the late plate-making and printing process of variable factors, so the result of the accumulated error led to more poor print quality.
¡¡¡¡2.Image accuracy.
¡¡¡¡The precision aspect requires that the image information is sufficient and the resolution is over 300dpi, which can guarantee the accuracy of printing. Early and network technical requirements "image resolution = plus net factor x and line number, and network factor = 1.5 ~ 2, and the founder of new screening technology level for the particular optimization, so there is no need to be limited to the formula, which is 300 lpi and don't require network image resolution of 450 dpi ~ 600 dpi.
¡¡¡¡3.Type of image.
¡¡¡¡The biggest feature of hybrid and secondary FM is to highlight the subtle gradation of the image, which means that the dot technology is very good at displaying the fine texture, texture and clarity. For image color, mix and network printing color gamut space and the traditional 200 dpi and there is not much difference, secondary FM screening printing color gamut space than traditional 200 dpi color gamut space is large, but from the print on the visual observation and the psychological impression evaluation, secondary FM screening in performance is not observer's eye color, the impact is not very clear, I guess maybe in very narrow the scope of certain conditions to show the advantage, hope can find in the future practice. As for the image contrast and appearance, the traditional 200lpi can be achieved through color management in CTP printing process.
¡¡¡¡So in order to make full use of the hybrid and network, and the characteristics of the secondary FM screening technology, image type choice before printing production of China and India need accurate positioning, which is not a living thing that can use of high-end network, matters needing attention are described below:
¡¡¡¡(1) in general, the image is the best with rich and high brightness distribution. Objects such as clothes, leather shoes and wooden doors; And rich, with high light is a large area of flat screen and gradient in the majority of the manuscript requires careful use, because although hybrid and network and secondary FM screening can reproduce the image of the complete order level, but due to the late plate making and printing factors, making it easier for the small network reduction as well as traditional 200 dpi design, micro performance for some good points reduction, some network representation is poor, some branches inky full, some branches inky untrue, finally on the macro in the printing quality is a reflection of the flat screen visual uneven, coarse;
¡¡¡¡(2) the character images (especially the facial features), need the original image quality is higher, especially the gradual transitional smooth, otherwise because of the influence of the manuscript, in the process of plate making and printing may be the cause of transitional jump, face is not soft;
¡¡¡¡(3) the landscape image feature (especially the sky), also need the original order level smooth transition, or because of the influence of the manuscript, in the process of printing may be the cause of transitional jump, grain weight;
¡¡¡¡(4) for the traditional Chinese painting, oil painting, gouache and watercolor manuscript, because generally the author draw in sense of rough surface of paper, although the hybrid and network and secondary FM screening dot small, plate making and printing dot reduction of incomplete and disadvantage, but for these original unscathed, even sometimes become advantage, so the use of hybrid and network and secondary FM screening technology printing such draft is relatively ideal;
¡¡¡¡(5) for paper printing, hybrid and network and secondary FM screening technology in CTP printing process can be used fully and the exquisiteness and network mode can make the image, texture and clarity as prominent as in accord with the characteristics and requirement of newspaper printing. Maybe some users worry about high fine screening compared with the traditional newspaper is printing the amplitude modulation and network of 100 ~ 120 dpi dark tone level and level and occurs on the printing paste such as fault, this is understandable, and indeed in the CTF problems in the printing process, but in the CTP printing process can completely through the color management can be solved.
¡¡¡¡4.Plate making process
¡¡¡¡Hybrid network and secondary FM screening technology is belong to the high precision and network, small outlets for CTP work state is more sensitive, so in the process of publishing process control need more strict than normal amplitude modulation. If published under the condition of poor sometimes appear striped phenomenon, and points the uniformity and stability of volatile, reason for such netting, publishing status need to strictly regulate format design, otherwise the printing quality will be no nets, and coarse grain quality problems.
¡¡¡¡5.Printing process
¡¡¡¡Hybrid network and secondary FM screening technology is belong to the high precision and network, small outlets for printing work state is more sensitive, so in the process of printing process control need more strict than normal amplitude modulation. Nakedness if branches of printing ink and edge is bright and clean degree, ink balance, the rubber surface and printing pressure, and so on are in better and stable state, so such outlets during printing to ensure the reproducibility and stability, can appear otherwise gradient transition is not uniform, such as large flat screen is not flat and color wave quality problem, cause the high-end and network printing effect than the traditional amplitude modulation and network.