So, I've got this pretty big (12 minutes, 3sec/slide) slide show. I may be done with it. I may not.

The show is composed of ten iPhoto-11 slideshows. Each one was set up 4:3, then exported, with the kind advice of Nathan in another question to specify H.264, 2048 bit rate, and the second-highest resolution (my pick on the theory that I was not going to be driving an HDTV, just a relatively ordinary projector).

Imported into iMovie-11 at 30fps, arranged, decorated with music, exported to via the share menu iDVD. Didn't touch anything in iDVD. just pushed the burn button.

Inserted resulting disk into nice new-ish dvd player with 30" LCD TV, 720 resolution. The pictures have a very visible structure of being built of little squares.

I dont' see artifacts in full-screen preview in iPhoto, or in full-screen imovie preview on my macbook pro. (On my mini, it warns me that full resolution will be degradated, so the presence of them there is not a surprise). But the DVD has this problem.


I discovered an option in iDVD to vary the 'encoding quality'. Moving that up to professional looked to me to make a notable improvement.


  • Is this a problem when you play the DVD on your computer? You can do this through the DVD Player app in your Applications folder. – Nathan Greenstein Feb 3 '11 at 1:22
  • I didn't try that. See update in a sec. – bmargulies Feb 3 '11 at 1:48
  • iMovie does compress movies.that may be why you are having problems with it. I have had the same problem with FCE movies and I had to use Compressor to re-encode it. It made a definite difference. – daviesgeek Nov 4 '11 at 22:15
  • If you are looking for a professional feel and image quality for your videos, I would recommend a semi-pro editor such as Premiere Pro, and using Compressor or DVD Studio Pro. – MicroMachine Sep 19 '15 at 10:49

This issue may have been caused by a variety of issues:

  1. The resolution was only at 720p.
  2. iMovie compressed the movies.
  3. The "encoding quality" may not have been up to par.

These programs have been updated significantly now, however. iPhoto has been replaced with Photos, and iDVD isn't supported now.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .