1.Resolution and clarity

Resolution is the ability to distinguish and reproduce the details of the original image of the printed image, or the ability of the image to distinguish the original deception. Clarity refers to the clarity of image details, mainly the clarity of the edges of the image and lines. The resolution of the printed image mainly depends on the number of screen lines of the image, but the number of screen lines is restricted by the printing material and the printing method, so it is impossible to always use a higher number of screen lines, that is, it is impossible to always obtain a higher Resolution, in addition to the accuracy of the printing overprint will also affect the image resolution. Resolution will also affect the sharpness of the image to a certain extent. Of course, the sharpness is also affected by the printing process, materials, and technology.

2.Surface characteristics
The surface characteristics of printed images include gloss, texture, and flatness. The requirements for gloss depend on the nature of the original and the end use of the printed image. In general, when copying photographic originals, it is better to use high-gloss paper. In actual printing, bright oil is sometimes needed to enhance the gloss of the subject image. A high degree of gloss will reduce light scattering on the surface, thereby enhancing color saturation. However, when using high-gloss paper to reproduce watercolors or pencil drawings, the effect is not very good. Using non-coated paper or matte coated paper, but can produce a better copy effect. The texture of the paper will damage the image to some extent, and you should generally avoid copying photo originals with textured paper. But when using non-coated paper to reproduce art, the original texture of the paper will make the printed product feel closer to the original.