Personally, I like either of these two lossless formats/CODEC's:
[Edit] This ARTICLE has the links to those.
Message was edited by: Bill Hunt - Added [Edit]
I understand. I often use the Premiere Elements Tips & Tricks sub-forum, as a repository for articles that apply to both versions of Premiere. It is a convenient location, and similar does not exist in the PrPro forum structure.
Now, some of the articles there, ARE just for PrE, and a few are ONLY for Premiere Pro, but most are universal, and where things differ, for say PrE, or PrPro, I try to show both, and differentiate between the differences, sort of like when one writes an article on how to do things, and those operations differ between a Mac and a PC. One tries to list both, so that the article is platform-agnostic.
Most of all, I am glad that it was helpful to you - that is what is important, at the end of the day.
Lagarith is a great codec, I personally always use Lagarith or avid's DNXHD 220 codec. If I'm purely just archiving something though I usually encode to black-magics motion jpeg codec. Motion jpeg is almost lossless but not quite but it actually gives decent file sizes. But if you want literally no visual quality difference I'd go with either avid's dnxhd 220 codec or Lagarith.
...what's the absolute best format to export these intermediate files as full 1920x1080 to avoid as much recompression as possible?
Others have answered your direct question. The implied question is about workflow and how to maintain maximum quality. One way is to avoid making an intermediate.
You don't have to work on your footage in separate projects. You can work on separate sequences inside one project. If you do this, you avoid having to create an intermediate and maintain highest possible quality.
What I've done before in similar situations is to create subclips and then create another sequence and work on those subclips there. The subclips reference the original file non-destructively as is PPro's way, so maximum quality is maintained. When you're done adding titles, transitions, audio work, etc. then you just export this sequence just like you normally do.
PPro is a huge and complex program, and there are usually many ways to accomplish the same task. I'm only bring this up as an alternative way of accomplishing this task on the off chance you hadn't thought of it. Clearly, YMMV.