Patrick Lavoie , Dec 29, 2005; 12:31 p.m.
According that you are printing in a news paper like, and the printer ask you for the correct word, DPI is Dot Per Inch, PPI is Pixel Per Inch. Theres is no < conversion > to make. It is very important to make sure that when you talk to people you mean, both of you, the same things. Now if you want to know how many PPI you need to get 100 DPI, its pretty simple; take the number the printer give you and multiply it by 2 (if you are a paranoi kind of guy) or 1.5 is way OK. So he need 100 x 2 = 200 PPI. The reverse is simple to, assuming that when people ask you for a 300 PPI file, that should mean they print at around (300 /2) 133 or 150. And yes if they are asking you for a 100 dpi, meaning 100 ppi in there head, yes it will be pretty noisy or maybe they printing on a large format inkjet and they think that 100 is enough. have fun: )