CHICAGO, Dec. 10 - Telephone directory publishers will experience improved color fidelity and increased detail in scanned photographs printed in directory advertisements as a result of R.R. Donnelley's implementation of stochastic screening. The company will move from conventional screening to stochastic screening for four-color printing of classified pages, tabs, covers and inserts. "We strive to enhance our customers' communications effectiveness by continuing to invest in new products and services,'' said Dennis Wall, senior vice president, operations, R.R. Donnelley Print Solutions. "We are again the first to implement a wide-scale launch of new technology and provide a quality solution.'' Stochastic screening is a digital process that converts images into very small dots of equal size and variable spacing, unlike conventional screening, which converts images into variable size dots placed on fixed grids and angles. Stochastic screening produces print quality that is closer to continuous tone reproduction. Advertisers will see increased detail in scanned photos, as well as smoother vignettes, elimination of screen moire, truer color reproduction, sharper detail in fine multi-color fonts and multi-color backgrounds.