Poor quality images on Slideshow

Hello all,
I recently downloaded Aperture from the Mac App store - seemed to good a bargain not to and I was already considering upgrading from iPhoto 08.
I imported all my pictures (along with the captions) into Aperture and created a slideshow from an album. I was quite disappointed to see that the image quality was really poor and very grainy. The photos themselves were fine in the album - but not so in the slideshow.
I thought this may have been down to importing from iPhoto, so I experimented by adding other images directly into Aperture. The same slideshow quality issue arose. I also possess a MacBook Pro and decided to re-perform the steps described above. The images and slideshow are absolutely fine on my MacBook pro.
I wish to maintain my photo library on my main iMac and will be very downhearted if Aperture cannot give me the same picture quality on slideshows that I achieved in iPhoto. Can anyone help me figure out why I'm suffering from poor quality images in slideshows on my iMac?
Thanks in advance,
Simon.

Hi Simon,
Aperture uses the image Preview in Slideshows:
_About Displaying Sharp Images in Slideshows_
To display slideshows at the best quality, you should set Aperture to create high-resolution previews. In addition to setting previews to their highest resolution, you should also use full-size previews to prevent upscaling with large displays. If previews are not available, images in the slideshow may not be as sharp as they would be otherwise. For more information about creating high-resolution previews, see Working with Preview Images.
From the [User Manual|http://documentation.apple.com/en/aperture/usermanual/index.html#chapter=21%26se ction=2]
What size Previews do you have?

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Poor quality images on Slideshow

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