Images that have been archived appear the same as all non-archived images. There is the capability to display an indicator with the thumbnail that indicates the image has been archived. The default behaviour of FotoAlbum is to not show the "Archive existing" indicator. As long as the image has been archived but not removed, the ability to view, print, e-mail is not affected.
Archived images that have been removed from your system will display the same thumbnail with an indicator showing the image is archived but removed. In addition, if you attempt to view the image (either full screen or preview), FotoAlbum will indicate it has been archived and will prompt you to insert one of the archives that contains that image. You will not be able to view, print, e-mail or share that image until you restore it from an archive.
The display of these extra thumbnail indicators is configurable using the Customizing thumbnails option.