Dots per Inch. Tones and process print are produced by printing millions of tiny dots of each selected colour. Graduations and photographic effects are therefore possible. DPI refers to the number of dots per line inch, so it is a measure of courseness or fineness of print. Typical dpi's are 55dpi for a Flexo Stack Press, to 100-130 for a Flexo CI Press. 175dpi is fairly typical for offset litho in carrierbag printing, dependent on paper finish. Please note the metric equivelant is dots per centimetre- expect about 2.54 times less! Beware that inch or centimetre is often unspecified. Also: LPI. Lines per inch, same as DPI. Don't confuse DPI with Percentage which is the size of the dot.