Can 't really help on the render settings here as i 'm still learning that myself, but i found this great article months ago which explains all about the dpi / ppi mystery, and i for one learned a lot from it :-)

So i give you http://www.dpiphoto.eu/dpi.htm

I encourage you all to read it trough and you will see the light at the end of the tunnel !
Hope this will help you a bit :-)

Wim

 

Society failed to tolerate me...

... and i have failed to tolerate society