Apple Aperture 2 - Manual (Page 170)

170 Part II Photo Editing
Identifying Referenced Images
After you import referenced images, you can identify them in the Browser by turning
on referenced image badge overlays. Referenced images appear with badges that
show whether their masters are currently available (online) or not found (offline).
To turn on referenced image badge overlays:
1 Choose Aperture > Preferences.
2 In the Preferences window, click Appearance, then select the “Badge referenced
images” checkbox.
You can select and work with online referenced images using the same procedures you
use with images whose masters reside in the Aperture library.
Aperture keeps track of referenced images’ masters when you simply move or rename
the files in the Finder, keeping them on the same hard disk or volume.
A referenced image appears as an offline image if the hard disk holding the referenced
image’s master has been disconnected from your computer system. A referenced image
is listed as “not found” when its master has been deleted, moved to the Trash, or moved
from its original hard disk location to another hard disk drive and Aperture can’t find it.
These badge overlays
indicate that the images
are referenced images.
This badge overlay indicates
that the image is an offline
referenced image.