O.k., here is a test:
I rendered a slideshow (classic theme) from jpeg without previews.
Export format HD 1080p, codec: H.264, pixels: 1728x1080, the highest resolution Aperture offers.
The video looks o.k., but not as crisp as the original images.
I really cannot tell, if the images actually have the full resolution.
I put three testimages on my MobileMe Gallery: http://gallery.me.com/dreschler#101100
1. The original image:
2. A section of the original image (above) and 3. a section of the same image in the rendered slideshow:
This images will be gone in June - Bye Bye Mobile Me.
Cheers
Léonie
P.S. The still frame fom the rendered slideshow was extracted with the video tool in Aperture. There are no options to set the quality of the resultinng still. But the quality is very similar to the actual video.
Extracting a still frame in iMovie does not longer work how it used to be - the stills seem to be videos now.😕