When the output device that will be used to create final, camera-ready artwork is a laser printer -- whether yours or ours -- use only 10%-60% screen
values. Lighter will not reproduce consistently; heavier will result in too much fill. Halftones should be scanned at 300 dpi (dots per inch) and 100 lpi (lines per inch).
If very fine screens, very light screens (as for ghost images), or photo quality halftones are essential for the finished printed piece, output to film is required. This too, can be prepared from your digital artwork, while slightly more costly, when
absolute quality is paramount that extra cost is readily justifiable.
If your artwork is to be produced in more than one color (but not process color), you will want to output the artwork as a "composite"
and as separate colors. The composite will show us how the final printed piece will look, and the separations are what we will need to produce your piece. If any of the colors overlap, or touch, the overlapping
colors will need to be "trapped" before we can print the piece. Trapping is necessary to allow proper registration of the colors. Minimum trap is 0.5mm for all elements.
Leave a margin of at least 3/8" on all sides of your artwork unless the finished piece is designed to "bleed" off the edge of the sheet. Artwork designed to bleed should be output on a sheet larger than the image area. Bleeds
should run 1/8" off the image area to ensure proper trimming.