GL-4
Halftone processing
Any method used to reproduce a photograph which includes a
shade as an image composed of dots, namely, a binary image.
Dithering and error diffusion processing are examples of halftone
processing.
Hexadecimal
A base-16 numbering system (also commonly referred to as hex
numbers). Since a base-16 system requires 16 digits, numbers 0
through 9 and letters A through F are used. It is convenient to
express binary numbers in hexadecimal because fewer digits are
required.
Image emphasis
Density is decreased for lighter but not completely white areas
adjacent to black areas. Weakening this emphasis eliminates spot
noise or produces softened images.
Image processing
An image is read with specified parameters.
Interface
The connection that allows communication from one part of a sys-
tem to another. For example, electrical signals are transferred
between the computer and scanner over an interface cable.
Inversion (Reverse-image reading)
In reverse-image reading, data is changed from black to white and
vice versa.
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