The icon with which the thumbnail is flagged is selectable by option. A standard set of icons is provided. More can be used by storing them in the user plugin folder in a subfolder named "flag_thumbnail".

States which may be flagged: New--images will be in this state based on their date (or mtime) being within the selected "range" of the current day. Protected--images which are password protected, either themsleves or because they are in a password protected album. Un-published--images that are marked as not visible. Geodata tagged--images which have latitude/longitude information in their EXIF metadata.