In iMovie 11, how do I export at my custom resolution/aspect ratio?

[Doju]

I see a few posts that say it will also export at the aspect ratio you imported at, but how?

I recorded a portion of my screen with Quicktime's screen recorder, and it came to a resolution of 680x812. I imported that into iMovie, as well as a 640x812 image at the end, but when I go to export, I only get this screen, where none of them are the resolution of my video, and it puts black letterboxing on the sides:

How do I do it?

Also, how do I get it to not degrade video quality?

 

[Dave Braine]

Use the Export Using Quicktime option from the Share menu. From the popup box, click on the Options button and then select the Size button. You'll find the Custom option there.