Referring to the capacity of an inkjet printer applies to a sheet of paper ,ranging from 720 to 2800 and more. The closer the proximity of the dots to each other, the more they synthesis to create continuous tones for print. All DPI depend on the type of paper is being printed on respectively, to get specs on DPI print click here.
72 DPI converts to 72 Dots Per Inch, and its usually used for web. 72 DPI pictures produce more pix-elated types of photos, which makes them seem blurry. Sometimes its wanted for the picture to be this type of image and presented as so despite the blur. This is due to the fact that there are less dots per inch in a 72 dots per inch picture compared to one with 300 or even 220. The DPI of 72 will always look blurry when printed or even looked at through computer screen. Its not recommended to use the 72 dots per inch format when printing because of the blurriness produced. Which don’t look professional at all, or even the slightest bit pleasant to the human eye when there are better dots per inch resolution options for print.
To start off a standard offset press medium quality screen is 133 LPI, as in lines per inch. There are various quality levels of lines per inch like 150 and 175. Above 175 it take more accuracy and time to print higher resolution lines per inch refers to the number of dots in a CMYK(Cyan, Magenta, Yellow, Key) output. In a LPI of 133 the picture will look medium to more less quality, the most LPI on a cheap paper is 133, usually having ink bleed all over the paper messing up fonts and images. Dots per inch and lines per inch have the correlation of multiplying or dividing numbers having 300 DPI will lead to 150 LPI. In the CMYK process (printing) information is thrown away leading to the LPI. Anything below 266 DPI will show pixels because of the “throwing away process.” Ultimately printing any image will produce reduction of DPI by half, when this is done it will scale down the actual picture. To fix this problem you will need to increase the size of the file by 10 to 15 percent accordingly to the appropriate size to what is needed. To completely avoid this problem its recommended to use larger dots per inch ratios, for example 600 DPI will ultimately half the size of the image but accordingly resize the image. To read mor about the correlation of DPI and LPI click here.