Questions on preview quality and where Aperture uses them

I have been reading Apple's Aperture articles about preview quality and how Aperture shares images with the outside world. I had always assumed that the full quality image in Aperture was used for printing, exporting and sharing, but it seems that, at least for sharing, it is the preview that Aperture creates that is shared.
I have just increased the quality of the previews that Aperture generates from 5 to 9 and forced Aperture to re-render all previews. It seems to me that the images on screen and in slide shows and other iLife documents, are now much clearer and brighter (the downside of this is that my Aperture library file has grown by 4 gigabytes).
This leads me to ask four questions about Aperture and preview use (if I may?).
Is a jpeg on a high setting (9) visibly better than one on a medium setting (5), or am I being led to see what I expect to see?
Apart from editing, slideshows and iLife and iWork documents, in what situations does Aperture use previews where high or low quality might make a difference?
Does Aperture use previews to compile photo books? If so, does the quality of the preview affect the quality of the final printed book?
Is it possible to set Aperture to produce high quality previews for images above a certain star rating and low quality previews for the rest?
Thanks for any answers you may have.
Alasdair

Previews are used within Aperture to quickly show an image in the main viewer before the master has been fully loaded, they are also used to see the referenced masters even if the external location is not available at that moment (not adjustments can be done then, but at least you can see the image)
Previews are used outside Aperture to share the images with adjustments without exporting every image. It comes in handy that you can drag an image from Aperture's browser to another app or the desktop (what you get there is the preview). iMovie or other iApps use previews, the bigger size and quality the better quality you'll get.
Once you set up the size and quality of the previews in Aperture's Preferences the previews are created with those settings. I guess you could lower the settings, in the browser select the images you don't need big previews, ctrl+click and 'update preview' to force create low res previews for those. After that you can put the settings back. But if you do any change to those images the previews will be updated. Certainly I don't see the point of having different previews, do some test find the settings that work best for you and keep it like that.
Turn automatic previews off and create manually the previews you need, I have a smart album with images rated 3 or more stars and I use it to select and create previews manually to those images.

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Message was edited by:
gusora

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