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Trapping

Because the commercial printing process involves laying down colours in sequence , as opposed to, for example, laser printing, it is nearly impossible to align every graphic object exactly.

Because of this, objects of different colours, that are next to each other, are set to trap. What this means in practice is that one object overlaps the other by a fraction of a millimetre, thereby ensuring that there is no white space in-between them.

Tritones

extend. tri-tones
Identical process to a duotone or quadtone, but with three printing inks, as opposed to two or four.

See also: Duotone, Quadtone