Bad image quality of slideshows

I am a new Mac user. I am having difficulty making slideshows from the iLife version 6 software with the features that I want and decent image quality.
I've been trying with iPhoto, iMovieHD and iDVD. I want to be able to put captions or title screens in my slideshows, so I must use either iDVD or iMovieHD. If I do not want my photos to pan and zoom, I can use iDVD. I've done this and burned the result to a DVD. When I play the DVD on my 65" wide screen high definition television, the image quality of the slideshow is not satisfactory. Diagonal lines have visible stepping. Just before a photo transitions to the next photo, there is a noticeable increase in the number of digital artifacts for about one second.
For some slideshows, I wanted to have the pan and zoom effects, and title screens, so I used iMovieHD. When I started the project, I chose the format 1080i because that is what my high definition television can do. I realize, however, that my DVD player cannot do that resolution, so I am not sure that was the correct format to choose. I "shared" the completed slideshow movie to iDVD. When I play that slideshow, I see many digital artifacts in the images as the zoom happens. The images are not as good as looking at the original digital photos on the computer.
Is there a way to make a slideshow on a DVD that has an image quality that matches the original digital photograph? Is it possible to use the pan and zoom effect when I wish to play a DVD slideshow on a television?
Any help is appreciated.
MacBook Pro Mac OS X (10.4.4) 2MB memory, 15"

I realize that I did not ask exactly the right question.
I've made slideshows using U-lead software on my windows XP desktop machine. The image quality of those slideshows on a standard TV is better than what I can do with iDVD and iMovie. So I'm wondering is there something I need to do in iDVD that might be automatically happening in the U-lead software. Obviously, I do not expect people here to know anything about that software, but you might know of something in the iDVD software that will prevent the digital artifacts that I see when I use iDVD to make a slideshow. So far, the slideshows I've made are bordering on not watchable.
MacBook Pro Mac OS X (10.4.4) 2MB memory, 15"

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