How does screen saver smooth pixelated photos?

When selecting an album of photos in Screen Saver preferences, I noticed that a small sized photo within the album appeared quite smooth when displayed via the Screen Saver, but the same photo viewed via Preview at the same magnification appeared highly pixelated.  I would like to know how this is done to make other photos look smooth at high magnification, outside of Screen Saver.

Hello, I believe it's Quartz Composer...
/System/Library/Frameworks/ScreenSaver.framework/Versions/A/Resources/.Quartz%20 Composer.saver/Contents/MacOS/.Quartz%20Composer
See also...
http://vidvox.net/wiki/index.php/Quartz_Composer

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