Halftone characteristic

In a facsimile system the halftone characteristic is either:
 * 1) the relationship between the density of the recorded copy and the density of the original, or
 * 2) 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 is under consideration.  In an FM facsimile system, an appropriate parameter other than the amplitude is used.