The process of converting a continuous tone image into an image that can be printed with only one color ink. Halftoning uses dots of varying size or density to give the impression of intermediate tones.
A method of representing the gray tones of an image by varying the size of the dots used to show the image.
This process lies in the our eyes' inherent inability to distinguish spots that are closely spaced. To convert a continuous tone image to print--whether it is one-color printouts (grayscale) or multicolored (4, 6 or 8 inks)--various patterns of ink droplets are varied to produce more colors and scales. Read more in Dithering.