Duotone images When creating duotone images, remember to output film at different angles. Offset the two film angles by 30-45 degrees to achieve best printed results for duotone images. Use elliptical dots Elliptical dots tend to reproduce more successfully than round or square dots. Use of elliptical dots results in fewer points of contact between dots and less bleeding, especially with midtone ranges. When submitting film, please remember to specify top and bottom and color of each individual piece of film, as well as the print order of colors.
Screen printing requires some overlap of adjoining images.
This overlap assures proper registration of multicolored images, especially those involving small blocks of type. Or, print the first color text bolder than the second color drop-out. Underprinting Print the first color as a small box, then print the second color with drop-outs. This method is easier to register than trapping, but some colors may change when printed over another color. For best results, use a light background color with a darker foreground color.