Halftone characteristic - AbsoluteAstronomy.com

Telecommunication

Telecommunication is the transmission of information over significant distances to communicate. In earlier times, telecommunications involved the use of visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs, or audio messages via coded...

, the term halftone characteristic has the following meanings:

In facsimile
Fax
Fax , sometimes called telecopying, is the telephonic transmission of scanned printed material , normally to a telephone number connected to a printer or other output device...

systems, the relationship between the density of the recorded copy
Facsimile
A facsimile is a copy or reproduction of an old book, manuscript, map, art print, or other item of historical value that is as true to the original source as possible. It differs from other forms of reproduction by attempting to replicate the source as accurately as possible in terms of scale,...

and the density of the object, i.e., the original.
In facsimile systems, the relationship between the amplitude of the facsimile signal to either the density of the object or the density of the recorded copy when only a portion of the system
System
System is a set of interacting or interdependent components forming an integrated whole....

is under consideration. In an FM facsimile system, an appropriate parameter other than the amplitude is used.