CTP plate-making machine screening various image characteristics are as follows:
Character images (especially facial close-ups) require high-quality original images, especially smooth gradation transitions, otherwise, the influence of the original, plate-making, and printing process may cause gradation transition jumps, and the face is not soft;
Landscape images (especially sky close-ups) also require smooth gradation transitions, otherwise the influence of the original, plate-making and printing process may cause gradation transition jumps, and the graininess is heavy;
For Chinese painting, oil painting, gouache, and watercolor manuscripts, because the authors generally paint on rough paper with outstanding texture, although the dots of mixed screening and secondary FM screening are small, there is a disadvantage of incomplete dot restoration in plate-making and printing, but it is not a big problem for these manuscripts, and sometimes it even becomes an advantage, so it is relatively ideal to use mixed screening and secondary FM screening technology to print such manuscripts;
For newspaper printing, hybrid screening and secondary frequency modulation screening technology can be fully used in the CTP printing process. These screening methods will make the image delicate, texture, and clarity more prominent, which meets the characteristics and requirements of newspaper printing. Perhaps some users are worried that high-precision screening will cause dark-level merging and blurring during printing compared with traditional newspaper printing 100dpi~120dpi amplitude modulation screening. This is understandable. This problem does exist in the CTF printing process, but it can be completely solved through color management in the CTP printing process.