Quote Originally Posted by RPMiller View Post
Here is just one of many links that you can find on the subject, but I picked this one specifically because it has print shop links as well. [U]Please understand... (CUT) ...misleading.

http://www.rideau-info.com/photos/mythdpi.html
I really must say that while the most information on the linked page is correct he doesn't get it all correct.

Here's some links to Wikipedia that's relevant:
http://en.wikipedia.org/wiki/Dots_per_inch
http://en.wikipedia.org/wiki/Lines_per_inch
http://en.wikipedia.org/wiki/Halftone

And here's an alternate way to describe dpi, ppi, and lpi. IMHO a more accurate than the photo guide above:
http://desktoppub.about.com/cs/inter...resolution.htm

The thing is that higher resolution does not always increase the quality of the printed image and in order to keep the image size down (in mb) it's better with as low dpi as possible but still high enough (about two times the lpi).