You can search for and locate images using any IPTC information that you’ve assigned to your images. To search for images by IPTC information, you use the IPTC search options. For example, you can search for any image that doesn’t have a copyright notice applied to it by specifying a search that uses the Copyright Notice field and an “is empty” search qualifier.
In the Projects & Albums section of the Library inspector, select the item you want to search.
Click the Filter HUD button (with a magnifying glass icon) beside the search field in the Browser (or press Command-F).
In the Filter HUD, choose IPTC from the Add Rule pop-up menu.
Select the IPTC checkbox, then choose the IPTC field you want to search by from the IPTC pop-up menu.

Choose an option from the middle pop-up menu to qualify your search.
Enter the IPTC value you want to search by in the IPTC text field.
Choose Any from the Any/All pop-up menu in the top-left corner of the Filter HUD, if it’s not already chosen.
The images that match the search criteria are immediately displayed in the Browser. To save your search results, see Saving Your Search Results.