The advanced filter dialog allows you to have complete control over the filtering of your pictures. The advanced filtering is available by using the "View->Filter" main menu item or by using the "CTRL-F" shortcut.
Ignore Picture Date: This option shows all pictures (with or without picture dates). It does no filtering based upon dates.
Without a picture date: This option only displays pictures that do NOT have a picture date. This is useful when trying to assign dates to all pictures.
Within a date range: The start and end date can be used to specify an exact date range of pictures. Either a start date, end date or both can be specified.
Text Filter: This allows you to only display pictures that have certain words in the caption, keywords or filename. It is not case-sensitive and all keywords entered must exist for the picture to display. Keywords can separated by commas or spaces. The "Caption", "Keywords" and "Filename" checkboxes allow control over what is searched. If checked, then the word(s) must appear in the caption or keywords. If unchecked, then it does not search that component. Note: Filename searches do NOT support wildcards, but you can achieve similar results by leaving off the wildcard character(s).
Web: These checkboxes allow you to specify only pictures that are non-published or published public or published private. You can choose any combination of these.
Only Pictures not assigned to Album(s): This is only available on the All View. If checked it only displays pictures that are not part of any album. This is useful to see what pictures are "unassigned".
Non-Recursive: This is only available on an Album View. When checked, it only shows the pictures in the current group. This is a temporary setting that behaves like the Non-Recursive preference.
Include Pictures: If this is checked, then pictures are displayed. If unchecked, then only videos are shown.
Include Videos: If this is checked, then videos are displayed. If unchecked, then only pictures are shown.