Apple Aperture Getting Started - Manual (Page 84)

84 Chapter 7 Displaying Images in the Viewer
When rating or adjusting images, you can set the Viewer to compare two images at once.
You can select an image to compare against and then display other similar or related
images next to it for inspection. You might use the Aperture comparison feature to select
images from a series or compare versions of adjusted images to see which is the best.
You can also set Viewer options that determine the amount of information that
appears with each image. For example, you can display images in the Viewer with their
keywords, ratings, and other information, such as IPTC or EXIF metadata.
Adjusting the Background of the Viewer
You may want to lighten or darken the background of the Viewer to better view your
images. You can darken the background from shades of gray all the way to black, or
lighten it from shades of gray to white.
To change the background of the Viewer:
1 Choose Aperture > Preferences.
2 In the Preferences window, drag the Viewer Background Brightness slider to lighten or
darken the background, then close the window.
You can use the Viewer
to compare two images.