Apple Aperture Late-Breaking News - Manual (Page 12)

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The Preferences window appears, and the Previews preferences are at the bottom of
the window.
 New projects automatically generate previews: Selecting this checkbox tells Aperture
to automatically build and maintain previews for new projects you create in the
current Library (and, by extension, in new Libraries). This checkbox sets the Maintain
Previews for Project setting (discussed below) for each new project as it is created.
 Share previews with iLife and iWork: Selecting this checkbox tells Aperture to create a
file, in XML format, that the iLife and iWork media browser (and Mac OS X screen
saver) use to access the Aperture Library. If this checkbox is deselected, Aperture will
not create this file for any of your Libraries, and the media browser and the screen
saver will not be able to see your Aperture Libraries. The XML file is updated
whenever Aperture quits or is no longer the active application. For very large
Libraries, the XML file can take some time to update. In this case, if you are not
sharing your previews with other applications (other than through drag and drop),
you may decide to deselect this checkbox.
 Preview Quality: Use this slider to determine the compression setting used for the
JPEG previews. The scale ranges from 0 (very high compression and relatively low
quality) to 12 (very low compression and relatively high quality). The lower the
quality setting, the less disk space a preview uses.
 Limit preview size: Choose the size (width and height in pixels) of preview images
from this pop-up menu. The default setting is “Fit within 2560 x 2560”. The “Don’t
limit” setting tells Aperture to make each preview the same size as the version. The
other choices limit the preview to a size no larger than the specified size. A preview is
never wider or taller than the version from which it is made. Aperture places asterisks
(*) next to choices that match the resolution of your currently connected displays.
Not all display resolutions are offered in the pop-up menu, so you may not see any
asterisks here. For more information about how much disk space is used by previews
at a variety of compression quality settings and picture sizes, see “
Comparing the File
Sizes of JPEG Previews and Their Master Files ” on page 22.
Note: Changing the preview quality and size settings does not affect previews that
have already been generated. If you want to regenerate previews using the new
settings, you must use the methods described in the following sections.