Lines per inch - refers to the quality of a halftone screen. it is important to distinguish it from dpi which refers to the resolution of a device or image. commonly lpi is used at exactly half of the dpi of the device or image, i.e. 300dpi would equal 150lpi.
(Lines-per-inch) This actually refers to the number of dots-per-inch in a halftone but the term is LPI and NOT DPI. You can see where LPI and DPI can get confused. This term is also known as the frequency in computer graphics (frequency of lines-per-inch). The standard LPI of a screen printable design is 35 lpi to 45 lpi for cartoon type work and f... Found on http://www.indigoclothing.com/glossary/
abbreviation for lines per inch, a unit used to state the resolution of display devices (such as television or computer monitor screens), or to state the line spacing of printed pages. Found on http://www.unc.edu/~rowlett/units/dictL.html