title: Halftone characteristic
text: # Halftone characteristic
  
  In a facsimile system the halftone characteristic is either:
  
  * the relationship between the density of the recorded copy and the density of the original, or
  * 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.
  