IMOVIE HD resolution and still pictures

[Heidi?]

Hi,
i'm for the first time using imovie HD to make at small advertising movie for a custumor. I'm making this movie from movie clips that i buy on the internet, logos and still pictures combined. The movie is going to be used on large screens in a big hall:
My questions are:
I've bought film clips in 720 is that enough?
what size do i make the still pictures before i import them?
when i import some of the jpg still picture i get af message telling med that i can't make ken burns effects on them - why?
How do i test the output of the overall movie?
How do i make the movie loop?

That's a lot of questions, hope that you can help me
http://images.macrumors.com/vb/images/smilies/confused.gif

 

[spinnerlys]

Do those big monitors support 720p?
How will they be fed with the material (hard disk, HD-DVD, Blu-Ray)?

720p should be enough.
What codec are they compressed with? Maybe you have to recode them if they are .H263/4, as this is only a distribution codec and not an editing codec.

If you don't pan and zoom the images (flying over them), you should crop/resize them to the appropriate dimensions (1280x720) to avoid strange resizing by iMovie (but I don't know how good iMovie handles pictures with different dimensions - Final Cut seems to do well).

Ken Burns effect - I can't answer that.
What size are those JPGs? And why do you use such compressed format?

On a TV screen supporting that resolution, or as an exported .mov or .mpg on your computer screen. What do you want to control?

Loop - depends on the player that feeds the monitors.