The printing process is a collection of other discrete processes all needed to produce the end
product; typically an image on paper. In reproducing a full, or four-color image a photograph is
separated into four components represented on film. One film is produced representing the
amount of cyan found in the image, one for the amount of magenta, and one for the amount of
yellow. A fourth film is produced which represents the black portion of the photograph which
typically is wherever cyan, magenta, and yellow are all present in equal amounts. In order to
simulate varying amounts of a given color found in a photograph, we use dots that change
diameter or total coverage. For example, if we took one spot on a photograph and broke it
down into its various components we may end up with something like this :