Manual Epson expression 1680 pro (page 142 of 147) (English)

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4 Glossary

subtractive primary colors

The colors of cyan, magenta, and yellow (CMY) which produce black when mixed

in certain amounts. In printing, black is often added to give more definition as

mixing of actual inks cannot produce pure black.

terminator

A device that stops electronic signals, and prevents them from proceeding or

returning to other devices. This is necessary to stop a signal from continuously

reflecting between devices.

threshold

A reference point that is used to determine whether data will be processed as

“on” or “off.” In the case of color image data, “on” means that a certain color will

appear in a pixel or dot, and “off” means that color will not appear there.

tone correction

A method of adjusting the tone curve so that the reproduction results on different

types of output devices have gradations similar to the original image.

tone curve

The graph that shows the contrast ratio between the input (original image) and

output (image data) in image processing.

unsharp mask

Originally a photographic process in which a sharply focussed and a slightly out-

of-focus image are combined to produce a sharper image. This process is

simulated by software to produce the same effect.

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Epson expression 1680 pro Manual

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