The 'Unofficial' iMovie FAQ

Working with Ken Burns and Stills

Last edited: 28 November, 2004
Author: Fred Shippey
Daniel Slagle

Used by permission of the copyright owner Fred Shippey

I wanted to establish the image size requirements to obtain the maximum iMovie image quality using the Ken Burns Effect.

I started with a high resolution scan I had shot on 4x5 film several years ago for sharpness testing. It had been scanned on a high-end professional scanner. The file was 5120x3840. I downsized that file in Photoshop (bicubic interpolation) to: 2560x1920, 1280x960, 640x480 and 320x240. I saved these files as JPEG - Quality level 10.

I created a new iMovie 3.0.1 project bringing the five test images into as still images. The Ken Burns Effect was set to Zoom: 5.00 and Duration: 15.00. The iMovie was exported to iDVD 3 and as a QuickTime Full Quality DV file.

Looking at screen grabs of the full images from the DV file, the 5120x3840, 2560x1920, and 1280x960 images were the same quality. The 1280x960 image was very slightly better than 640x480 image. The 640x480 image was slightly better than 320x240 image.

Looking at screen grabs of the 5x zoomed images from the DV file, the 5120x3840, and 2560x1920 images were the same quality. The 2560x1920 image was better than 1280x960 image. The 1280x960 image was much better than 640x480 image. The 640x480 image was very much better than 320x240 image.

When I viewed the DVD I had created on a TV set, the quality differences were not as apparent.

Conclusion: When using the Ken Burns Effect at maximum zoom (5.00x), using an original image at least 2560x1920 produced the highest quality zoomed-in image. If you don't intend to use the Zoom Effect, a maximum image size of 1280x960 is sufficient.

iPhoto picture

Related:

How come my text and titles are blurry?
How should I scan my Photos?

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