To achieve better scanning results, high-quality materials are needed. The order of scan quality for different types of materials is: color positive film, photographs, and printed materials. For color negative films, due to the issue of color reproduction, it's best not to be used by non-professionals. Among these, printed materials are the most common. The key to scanning printed materials is to select good de-screening parameters. Users can first compare different parameters on a local part of the material to find the optimal parameters.