Behaviour of Some Custom Programmed Screening Elements in Various Printing Systems

Most commercial graphic arts reproduction systems use screening or printing elements for coverage and-or applying the inks to the substrate. In that way the specific reflectance of some area is changed, so various shades of gray or in the separation principle various shades of color are obtained. Standard screening systems combine adequate rulings with screening elements that are usually round, square, various eliptical shapes, in some specific situations lines waves or special technical shapes are used (1). They are usually presented as modules in RIP system. Todays purposes are more wide, and some specific or custom designed elements can be programmed and applied in various fields of use. According to their shape, their usage has to be considered with more care, because not only reproduction, but also the specific message could be poor.