Commercial image providers like Art Resource, Corbis, etc. license images for a negotiated fee based on the type of use (educational, commercial, petc.) The search capabilities of these providers allow for easy location of images by subject content, and often lead the researcher to the identification of the original artwork, and/or its location in a museum.
Art Resource. Extensive fine art stock photo archive. Images are watermarked unless licensed from Art Resource. The size and usability of the image database makes it an excellent research tool for locating and identifying images.
Daily News Photo Archive. A comprehensive visual history of New York and world events captured in unique Daily News style, with photographs dating back to 1880.
Getty Images. Creative and Editorial photo service. Register and create your own lightbox.
Scholars Resource (Saskia). Provides high quality images, (often in several views of the same artwork), with comprehensive coverage of artworks for teaching. Image collections from Saskia Ltd., Davis Art Images, Hartill Art Associates, Archivision and Bridgeman Art Library are represented. Scholars Resource licenses high quality images and metadata in consistent formats from multiple vendors at one online source. Database images in thumbnails only.