Microtek ScanMaker 5 User's Guide download pdf (Page 216)

Glossary G-5

Line art

A type of single-bit image that is just purely black and white, such as a pencil

or ink sketch. Line art may also include one-color images, such as mechanical

blueprints or drawings.

Lpi (lines per inch)

The resolution of printed images. Lpi is distinct from dpi, which measures the

resolution of electronic images.

Midtones

The parts of an image between the lighter and darker areas, at around 50% gray.

Moiré

An undesirable pattern in color printing that results from incorrect screen

angles of overprinting halftones . Moirés usually result when you scan a halftone

or when you scan images taken directly from a magazine (instead of scanning a

photographic original or a transparency).

Optical resolution

The true resolution of a scanner and is the key factor in determining the amount

of detail visible in an image. Optical resolution is one type of resolution; the

other is interpolated resolution .

Pixel

A unit used by the computer to describe picture elements and to represent

image information in a digital format. An image file, for instance, is simply a

representation of hundreds (or thousands) of pixels arranged in a grid.

Printing methods

The type of printing method you choose should be tailored according to your

scanned image. For instance, low-resolution black-and-white printers are good

for producing text and line art , but they are not suitable for grayscale . For

grayscale, use higher-resolution printers such as the ones capable of producing

600 to 1200 dpi. To print color images , you can choose from ink jet/desk jet

color printers, dye-sublimation printers, or printing presses.

Resolution

The level of detail in an image, expressed in dots per inch or dpi. The greater the

dpi number, the higher the resolution and the resulting file size. There are two

types of resolution: optical resolution , and interpolated resolution .

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Microtek ScanMaker 5 User's Guide Page 216