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iPhoto ’11: The Macintosh iLife Guide to using iPhoto with OS X Lion and iCloud by Jim Heid, Michael E. Cohen, Dennis R. Cohen

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Saving as TIFF

Given that you’re obsessed enough with image quality to be shooting in raw mode to begin with, you might lament the fact that iPhoto saves your edited images in the lossy, 8-bit JPEG format. You have a higher-quality alternative: tell iPhoto to use the TIFF format when saving edits to raw images.

To do so, choose Preferences from the iPhoto menu, click Advanced, and check the box labeled Save edits as 16-bit TIFF files. The resulting file will be much larger than a JPEG, but it will have that 16-bit headroom described on page 73, and it won’t have any lossy compression.

Is it worth the extra storage space? Possibly, particularly for images whose brightness or levels you’ve altered dramatically. JPEG versions of these images might ...

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