Apple Aperture Late-Breaking News - Manual (Page 9)

9
Uses of Preview Images
Aperture preview images improve the display of images in Aperture and allow you to
easily use your images in other applications.
Displaying Images in Aperture Slideshows
In previous versions, Aperture decoded the master file and applied the adjustments as
the image was displayed during the slideshow. Now it uses the JPEG previews to display
images in slideshows. The result is smoother, more responsive slideshows. However, if
the previews are absent or not up to date, Aperture must render the preview images
before the slideshow begins.
Note: You can control the display quality of images in the slideshow using presets.
“Best” quality uses the JPEG previews, rendering them if necessary before the slideshow
begins. “Good” quality uses the 1024-pixel (longest dimension) thumbnail images, which
are always available and do not need to be rendered. The 1024-pixel thumbnail images
are large enough for many projectors used for slideshows. For more information about
slideshow presets, see the
Aperture User Manual in the Aperture Help menu.
Displaying Images in the Viewer
When a version needs to be displayed in the Viewer, Aperture does the following:
1 Aperture draws the thumbnail image (a JPEG image that is 1024 pixels in the longest
dimension).
2 Aperture draws the JPEG preview, if present.
3 Aperture decodes the master file and applies any adjustments to it.
Once the third step is completed, the adjustment controls become enabled. Because
the JPEG preview is created with all the adjustments for that version, it appears
onscreen faster than the adjusted master file would. The result is a sharp preview
image that appears quickly in the Viewer.
Dragging and Dropping
When a version has a preview built for it, you can drag the image directly from the
Browser to any application that accepts JPEG files, including the Finder, Mail, and most
other applications. If the version doesn’t have a preview, drag and drop is disabled for
that version (except within Aperture). If you are dragging multiple images, but only
some of them have previews, only the versions with previews are dragged out.