Andem - 7:04 pm on Jun 6, 2012 (gmt 0)
From what I understand in the first part of this thread, the discussion is about whether PageRank flowed to image files. From my experience, it doesn't but the pages linking to the image files can have an effect to how they rank (SERP, not PR).
What we need is some A/B testing to figure out whether linking to images can be a drain on on-site PageRank.
If you had a PR5 (Page A) page linking to 4 JPEG files and 1 other page (Page B), would 100% of the PageRank that is passable flow only to Page B, or would those JPEG files eat up some up the PageRank which would have normally flowed to Page B (without the JPEG links)?