Not sure what "loggerheads" means, but it sounds kind of cute! http://www.talkgraphics.com/images/smilies/biggrin.gif "Hey, look at that couple out on their first date - they are all "loggerheads" with each other - awww!" http://www.talkgraphics.com/images/smilies/smile.gif

The reason why you see tutorials on the web mentioning 72 dpi and 96 dpi - is because they are normally written for people who re-size images once in a blue moon. And using simple applications that only mention dpi (or ppi). 72/96 or 300 dpi in those applications are normally just a simple approximation (guideline). For most people, exact file sizes don't really matter. Exporting at "web resolutions" is close enough for people sending out an occasional email with some family snapshots attached.

I did a search on Google for 72 dpi / 96 dpi tutorial and found a really LOOOONG one:

http://www.scantips.com/basics1a.html It also explains this obesession with 72 dpi (in the end of it). I think Gary or Klaus has also mentioned it here at TG before?! Yes, at one time 72 dpi was exactly one inch - on a 1984 Macintosh computer... Monitor sizes and resolutions has come a long way since then... So has the ability to display images on-screen.

As for the "difference" between DPI and PPI - Instead of making this post even more long-winded - also look at this article at my favourite camera review site (Steve's) - http://www.steves-digicams.com/techc...uary_2005.html