In low-resolution screening, amplitude modulation screening is often the first choice for screening because of its simple calculation. AM and FM screening algorithms have their own advantages and disadvantages. With the development of technology, Hybrid Screening came into being and gradually became the first choice. Hybrid screening means that both the FM screening method and the AM screening method are included in the same screening image, and their respective lengths and their respective shortcomings are taken as shown in the figure.
Hybrid screening effectively absorbs the advantages of AM and FM screening, while avoiding the deficiencies of both. At present, the specific implementation methods of the hybrid screening technology mainly include the following 4 types:
â‘ Different tone levels adopt different screening technologies. Generally, AM screening is used directly in the mid-tone area, while FM screening is used in the highlight and dark areas.
â‘¡The dots of different gradations use the characteristic algorithm of frequency modulation and amplitude modulation at the same time to perform hybrid screening of the screening, that is, the size and density of the dots change with the change of the gradation level. It is called "second-order FM screening".
â‘¢ Different screening technologies are used for different color separation films. Generally, the light yellow version with weaker interference can be screened with amplitude modulation, while the other three-color versions are frequency-modulated, such as a] screen, or they can decide whether to use frequency modulation or amplitude modulation according to the specific characteristics of the image color.
â‘£ Object-oriented partition screening technology, that is, FM screening is used for certain areas of the page (such as sensitive areas prone to streak interference), and amplitude screening is used for other areas.
At present, the hybrid screening technology of the first two methods is mainly used in the market. The key to the first method is how to achieve smooth transition between two fundamentally different screening algorithms, FM screening and AM screening. In most hybrid screening technologies, the boundary between FM screening and AM screening can be discerned by the naked eye, and the complex screening algorithm will slow down the pre-press process. At present, there are mainly three types of implementation methods in the transition area screening: Hybrid screening, sambaFLEX screening and Subima Jinghua branch screening. The center distance of the dots in the second hybrid screening method varies. Closer to FM screening. Currently, Staccato screening and Spekta screening are commonly used.
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