Contone Image Resolution
Contone images should be 300 dpi resolution with a minimum of 200 dpi. Scaling images to make them larger in a page layout program lowers the resolution, so it is best to limit scaling.
Linework Resolution (Art work made of solid lines)
Linework images should be 1200 dpi resolution with a minimum of 600 dpi. Scaling images to make them larger in a page layout program lowers the resolution, so it is best to limit scaling.
Duotones and Tritones
Duotones should not surpass 180% in total density. Tritones should not surpass 270% in total density.
Black and White Images
Images should be prepared with the following characteristics: 2–3% highlight, 5% crop, 92–96% shadow, and linear tones between highlight and shadow.
4/c Black Images
4/c images that appear to be black and white but use other process colors to add richness and density should be built as full range black with CMY values starting at 1% when the black value is 25–30% and peaking at the shadow of the black at 60% maximum CMY values. In short, the black channel will have a full tonal range, while the CMY channels will be limited.