The definition, sharpness, or level of detail of the reproduction of an image. Resolution is directly related to the number and density of the dots of color (black, white, and perhaps other colors). Group III facsimile specifications, for example, provide a number of options, expressed as horizontal lines per inch (lpi) in terms of scanning (input), and linear dots per inch (dpi) in terms of sensing and printing (output).The actual (and nominal) fax industry standards are as follows: