1. A method for selecting image content for a document, the method comprising: performing image analysis on a collection of image content items to obtain information about each image content item, including one or more of (i) determination of one or more objects in individual image content item, (ii) determination of a signature value for each determined object; storing the information obtained from the image analysis in a database; making the database available for search operations that specify one or more criteria determined from a text or image content provided in connection with the document.