Flickery transitions in iDVD slide show

I have burned two disks now using iDVD and had no trouble but I do have a question about transitions in slide shows. On the first disk I used a slide show (8 minutes, 99 images) with the “fit to music” option and the “use safe area” option for the display. The images were a little too small for my taste on my TV so I redid the show and unchecked the “safe” option. At the same time, I cut 9 of the slides but since I kept the “fit to music” option the timing was slightly slower. Fine, but I noticed that the dissolves between the images were “flickery” when compared to the first one on my TV. I had extracted the .dv of the first slideshow and included it on the second DVD so I could compare them directly and it’s true - they are smooth in the first but noticeably less so in the second, full screen, slideshow.
Has anyone else had this happen? Should I try to add nine more images back in? As it takes over an hour to burn this disk on my old, slow machine I'd rather ask first than attempt every possible variation on my own.
I can add that both disks were burned with the 60 minute “faster” rather than the 120 minute “better” quality mode. Since one doesn’t display the flickering I don’t really think the quality mode is relevant but who knows...
iDVD 4.01, G4 400 mhz 896 megs ram
G4 Sawtooth Mac OS X (10.3.9) 896 RAM, 620 gigs HD
G4 Sawtooth Mac OS X (10.3.9) 896 RAM, 620 gigs HD

Hi Rick:
Matti Haveri (one of the top rated iLife members) has done tests on this subject. here are his results:
----quote:
Movie slideshows tend to flicker with high-frequency images while "soft" images are OK.
So I did a quick test to see how the input image's resolution and blurring affects the output quality of those high-frequency images.
Test material: some 2048x1536 digital camera JPG images that had a lot of very sharp edges (buildings, thin wires, construction work scenes etc -- i.e. "high-frequency" images). I converted them to TIF so that there was no lossy JPG degradation involved. I manipulated the images in Photoshop as follows:
1. original 2048x1536
2. original bicubically resampled to 768x576. I guess also iPhoto bicubically resamples; at least the results are very similar. On the other hand, I believe Graphic Converter does not have bicubic resampling so I haven't got as good results with it.
3. original bicubically resampled to 640x480
4. original with 90° (vertical) 3 pixel Motion Blur. The idea is to blur only the horizontal thin lines which flicker on an interlaced TV. The vertical lines are unaffected by this filter.
5. original with 1 pixel Gaussian blur. This blurs horizontally approximately as much as the 3 pixel Motion blur, but it blurs the image also vertically.
In iMovie's 4:3 PAL standard DV project (720x576) I applied to each image a) no Ken Burns and b) 1-5x zoomed 10 second Ken Burns. I did not let iMovie render the non-Ken Burns images while exporting the project to iDVD because that is a well-known source for bad quality.
I burned the project via iDVD's Best Performance to DVD and checked the result via an interlaced 28" CRT TV.
The results:
#1-5 were all sharp with no Ken Burns as well as with 1x zoomed Ken Burns. But the higher resolution non-blurred input images were, in fact, TOO sharp and thus flickered on a TV:
1. 2048x1536 flickered very badly with and without Ken Burns
2. 768x576 flickered slightly less but also very disturbingly
3. 640x480 flickered only little. But both #2-3 tolerated the 3-5x zoom very badly because the input resolution was so small. The zoomed-in image was too blurry and the details were lost.
4. Vertical Motion Blur didn't flicker at all. But during the zoom there was some disturbing "living" in the vertical lines. Obviously the vertical lines must be blurred, too:
5. Gaussian blur didn't flicker and the zooms were beautiful and peaceful. The Gaussian blur lost some fine detail in the zoomed-in image but the quality was very good. And the loss of fine detail is just a trade-off for the flickerless image.
In fact, I have had very similar results to #5 with Photo To Movie's High Quality setting. Also Toast's slideshows are of good quality. A lot of people have also been satisfied with Still Life and PhotoMagico.
Conclusions:
- iMovie should blur the images so they wouldn't flicker on a TV. Applying a small Gaussian blur to the input images seems like a good workaround.
- Using Photo To Movie, Toast, Still Life and PhotoMagico and other 3rd party utilities are good alternatives, too.
----end quote
:)Sue

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