In lithography, the ability to make a color separation from an original which has already been separated and published. There are limitations. Since the same basic screens and screen angles are used, it is necessary to slightly enlarge (104% or greater) or reduce (90% or smaller) in order to reduce or eliminate conflicting screen angles causing a moiré pattern. The further use of a sharp or unsharp masking controls and the use of selective focus may also be necessary.