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A quad tone has more potential to show more detail in the 1/4 tone of an image over a duo tone depending on what colors are used and how. This is typically why you may see 4 color "halftones" on certain jobs over just black and whites. Most duotones that are two pms colors suffer from a decent 3/4 to shadow weight. Adding a 3rd or 4th color can help to punch up what we want to see as black shadows in that case.
If built properly with total ink in mind for the press and stock no multicolor image should be an issue for press. At times it's nice to let the pressman have more "color" to play with also. Much easier to change the balance on a quadtone than a halftone.
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Lammy
EPP Manager • Brass City Printery
OSX 10.4.10 • RAMpage 9.4 • EFI Colorproof XF
Avantra 30 • Epson 7600
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