Why does my photo slideshow quality deteriorate when exported to iDVD?

I have a client whose photos look great in iPhoto & iMovie, but look all pixelated when exported to iDVD. I've tried making a slideshow directly with iDVD, but the photos still look worse than they did in the iPhoto slideshow.
The size of the photos is pretty large (as big as 5233 x 3546), which I'm guessing might be part of the problem, so I tried exporting them from iPhoto with a limitation of 720 x 540, but they still look bad. I expect a decrease in quality once I burn the DVD, but these look bad even in the DVD preview.
Any ideas?

All DVD slideshows are defaulted to 640 x 480 pixels. That's the standard. As long as the photos are in the 4:3 dimension ratio you can leave them at their fullest size. You can try using the Pro Quailty encoding to get better quality images. IMO the best image quality is obtained by creating the slideshow in iDVD from still photos. You don't get the Ken Burns effect, but in my opinion it's a bit over used too many time.
If you are creating your slideshow in iMovie then try the following.
1 - when your slideshow is how you want it quit iMovie.
2 - open iDVD, create a slideshow and open the slideshow edit mode.
3 - drag the iMovie project file into the slideshow pane on the left. (NOTE: this lets iDVD scale the movie file to the TV safe area when played on CRT TV sets.)
This also lets iDVD do the encoding for the iMovie assets and avoids two compressions, one by iMovie when you export to iDVD and the iDVD encoding.
TIP: For insurance against the iPhoto database corruption that many users have experienced I recommend making a backup copy of the Library6.iPhoto (iPhoto.Library for iPhoto 5 and earlier) database file and keep it current. If problems crop up where iPhoto suddenly can't see any photos or thinks there are no photos in the library, replacing the working Library6.iPhoto file with the backup will often get the library back. By keeping it current I mean backup after each import and/or any serious editing or work on books, slideshows, calendars, cards, etc. That insures that if a problem pops up and you do need to replace the database file, you'll retain all those efforts. It doesn't take long to make the backup and it's good insurance.
I've created an Automator workflow application (requires Tiger or later), iPhoto dB File Backup, that will copy the selected Library6.iPhoto file from your iPhoto Library folder to the Pictures folder, replacing any previous version of it. It's compatible with iPhoto 6 and 7 libraries and Tiger and Leopard. iPhoto does not have to be closed to run the application, just idle. You can download it at Toad's Cellar. Be sure to read the Read Me pdf file.≤br>
Note: There now an Automator backup application for iPhoto 5 that will work with Tiger or Leopard.

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