A MacWorld story this morning notes the release sometime later today of Aperture 1.5.1 for Mac, a free update to Apple's pro photo management and RAW conversion application. Performance improvements related to the generation of previews headlines the changes in the new release, says the story. Also to come available today is a fully-functioning downloadable demo version of Aperture, plus a separate update for the program that adds support for RAW files from the Canon EOS Digital Rebel XTi/400D and Nikon D80.

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