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UCA (UnderColor Addition)
Un color process printing, used with GCR, UCA is ink added in shadow areas to increase color saturation.

UCR (UnderColor Removal)
In process multicolor printing, color seperation films are reduced in color in neutral areas where all three colors overprint and the black film is increased an equivalent amount in these areas. This improves trapping and can reduce makeready and ink costs.

UGRA Test Target
A measure of image resolution and dot size on plates and in printing.

Uncoated Paper
Paper made of interlocking paper fibers without the addition of a binder that creates the printing surface.

Undercut
In printing presses, the difference between the radius of the cylinder bearers and the cylinder body, to allow for plate (or blanket) and packing thickness.

unit
In multicolor presses refers to the combination of inking plate and impression operations to print each color. A 4-color press has 4 printing units each with it's own inking, plate and impression functions.

UNIX
A multiuser, multi-taking operating system that runs on a wide variety of computer systems from microto mainframe. UNIX was written in the C programming language. It is the most common operating system for serves on the internet being much preferred over Windows.

Upper Case
Capital letters in type.

UV Inks
Solventless inks that are cured by UV radiation. The are used extensively in screen printing, narrow web letterpress and flexograohic printing.