Tarek Bahaa El Deen
Assistant Professor in Graphic Design

what is different between resolution in dpi & lpi ?

dpi (dot per inch)
The number of dots that fit horizontally and vertically into a one-inch measure. Generally, the more dots per inch, the more detail is captured, and the sharper the resulting image

lpi (Lines Per Inch)
The number of lines in an inch, as found on the screens that create halftones and four-color process images (for example, “printed 175-line screen”). The more lines per inch, the more detailed the printed image will be. With the demand for computer generated imagery, the term “dots per inch” (which refers to the resolution of the output), is replacing the term “lines per inch.”

but what is different between resolution in dpi & lpi ?

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Juan Pedro Secondo

Posted on Jul 24, 2013 4:45:26 AM Permalink

Back in the 80 the most common printers available were the dot matrix. DPI - dot per inch was used to establish the precision of the printer. In general it reflects the horizontal precision. CPI - characters per inch. LPI - lines per inch does the same for the vertical precision but counting complete lines of text.

As with dpi, cpi and lpi there is a speed measurement. DPS dots per second, CPS characteres per second and LPS lines per second. The last one used for special printers that used multiple printing heads to achieve extra speed (3 heads would take 1/3 of the time to print a single line of text and so forth).

Nowadays in a laser and inkjet world the only measure used is the DPI.

Rakesh Mondal

Posted on Jun 2, 2013 9:24:38 AM Permalink

One of the big differences between a desktop printer's DPI and an offset press's LPI is that the dots (from DPI) are ALWAYS the same round size, while an offset press's LPI relies on varying the size of each impression, as well as using non circular impressions laid down in specific directions (or degrees).