Half Tone Screen

‎Screening is‎‎ a photographic technique used in the graphics industry to simulate in print the chiaroscuro variations typical of traditional photographs. ‎
‎This artifice is used because, any printing process, uses ink of a single color (usually black) to reproduce on paper the graphics contained on the form. Black ink alone is therefore not able to reproduce any chiaroscuro variation on its own. To allow the tonal modeling that an image contains, it is therefore necessary to "reconstruct" the image in the form of equidistant dots of variable size. This depends on the level of gray you want to achieve. The set of dots constituting the printed image are reproduced on paper with black or colored ink. Consequently, by contrast with the paper, the latter make our eye perceive the photographic effect that we all know‎