Reducing program sluggishness when Aperture is generating JPEG previews in the background headlines the list of changes in Aperture 1.5.1, released today by Apple as a maintenance update that implements more than 100 minor performance or stability tweaks. Apple is also making available a downloadable, fully-functioning 30-day trial version of the Mac-only application. In addition, the company has posted the Digital Camera Raw Support Update, an updater for the RAW processing code built into the operating system that adds support for the Canon EOS Digital Rebel XTi/400D, Nikon D80 and Pentax *ist DS.

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