Is it possible to improve the poor quality of DVD's?

I started my presentation in Keynote and exported the file as a quicktime movie (high quality). I then moved the quicktime movie into iDVD and when I previewed the project, the quality looked crisp...so far so good. I then proceeded to burn directly to DVD and the quality was, for lack of a better word, crap. I tried creating a disc image and using Toast but unfortunately it's not rearly as sharp as it was within iDVD.
This has been bugging me for about weeks now. I've been reading the discussion boards for a while and haven't found a solution to my problem. Any help would be greatly appreciated.

Hi,
I'm also a very frustrated user experiencing the same problem with iDVD 6. This was not seen when I was using iDVD 5.
I've made a .dv file with imovie 6.0.1, and upon "Sharing" to idvd, I didn't see any drop in quality during preview. Its only when I've the DVD disc image file where iDVD compresses the .dv format to mpeg2 that a significant loss in video quality can be seen.
I've also tried out different methods of encoding the .dv file using other software:
1. Toast 7.0.1 : Same poor quality mpeg2
2. ffmpegX : I tried tweaking different settings, (video bitrate, etc), but only very insignificant improvements were seen. ( Anyone out there with success in finding the right combinations of options, please post reply!)
3. JES Deinterlacer : I don't think the problem lies with interlacing, as I don't see much improvements here either.
Anyway, has anyone checked out this website:
http://www.kenstone.net/fcphomepage/idvd_6stone.html
I've actually contacted the website owner Ken Stone via email, asking him if he has seen this problem. He replied to me that he did not experience quality loss since he did not work with imovie.
I'm pretty baffled here, as I thought the problem clearly lies with the process of dv to mpeg2 encoding, and not the software that was used to create the movie or .dv file?
Anybody out there has a workaround or a definate solution?

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Thank for a compresensive post too, one with a lot of useful detail. There might be a few more questions that get asked, but we could use your post as an example of how to ask a question.
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[Moved to Premiere Elements Forum]

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