Q Is there a way to control, with which resolution the images show up in the pdf. Is it currently 72dpi?
Yes, if we have low resolution and high resolution versions, we want to use the low resolution version on the web and the high resolution version in print. We achieve that like this: [[http://link.to.hi.res.image | http://link.to.lo.res.image]]
On the web page, this displays the lo res image as a link to the hi res image. In print, it will use the high res image. This also gives authors a way to have different size images for print and web.