Electronically Generated Halftone Pictures

New kinds of screening systems are discussed and compared with conventional halftones. Particular attention is paid to increasing the resolution of the final printed output, to quantizing of the grey levels, and to overcoming moire and color-shift problems in multicolor printing. An electronic screening system was built to test the predictions, using a modified mechanical scanner. It changes a continuous-tone picture into one consisting of arrays of equal sized square dots. By using clusters of such dots, conventional looking halftones can also be generated. Examples are shown of pictures prepared by this technique. dots. By using clusters of such dots, conventional looking halftones can also be generated. Examples are shown of pictures prepared by this technique.