Why are slide show images less sharp than preview images?

Dear Aperture users,
as documented in the manual and on Apple's support pages, Aperture 3 uses the preview images for its slide show. However, when I compare the quality of my preview images in full-screen mode with the quality of the slide show images, the preview images clearly look sharper.
Apparently, Aperture's slide show does not simply use the preview images as documented, but applies some sort of "adjustment", resulting in less crisp looking images. Since I haven't found any satisfying answer yet, my questions are:
1). What exactly is the adjustment that slide show applies to the preview images?
2). Can I somehow tweak this adjustment, say, with a terminal command?
Best regards,
Dirk61.

iPhoto can make two different types of slide show movies. It would help to know which you're making.
One is made via the File/Export to QuickTime movie and makes a 4 track file with a simple fade effect. These use the Photo-JPEG codec.
The other is a 30 fps "video" using H.264 video codec via the "Share" menu.
A third method (rarely used) is to Export to iDVD. This makes an absurdly high data rate MPEG-4 video. This is also found under the Share menu.
The MPEG-4 video codec also includes an "automatic" gamma correction feature which compensates for the gammas difference between Mac's and PC's.
Try one export to iDVD. Include your audio track prior but use a high quality (.aiff) sound file. No need to actually "burn" the DVD. You can even close iDVD after it opens. You'll find the new movie in your Users Movie folder.
Open it with QT Pro and export to a new .mov file. Adjust the data rate to something more reasonable and add some audio compression.
If the colors still look too dark you can use the built in Filters in the Export dialog. You can adjust B&C or HSL or even use ColorSync Profiles that can help correct the image quality (if needed).

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Why are slide show images less sharp than preview images?

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