the invention relates to printing , to facsimile and publishing techniques , in particular to picture reproducing systems capable to form two optical parameter levels , only . said invention makes it possible to increase a fine detail reproduction accuracy , in particular , strokes on a screen copy and to more fully use a printing resolution power . the inventive method consists in converting a continuous tone original represented by multilevel reflection values of the areas thereof into a screen copy consisting of dark and light elements by using two types of weight values of the copy elements , wherein the first weight values are distributed between the elements in a sequence independent of the tone modification behavior through the original areas , and in the second sequence according to the geometry of the fine details thereof , in forming the copy elements in such a way that they are dark or light according to results of comparison between the reflection values of the original areas and the weight values of the first and second types , in increasing the degree of use of the second weight values for the fine strokes of the original with respect to the use thereof for single interfaces , which divide the original into dark and light regions and in removing elements which are established in a dark form according to the first weight values inside the light strokes arranged on a dark background .