Getty Open Content Program
http://www.getty.edu/about/opencontent.html

The Getty makes available, without charge, all available digital images to which the Getty holds the rights or that are in the public domain to be used for any purpose. No permission is required. The Getty adopted the Open Content Program because we recognized the need to share images of works of art in an unrestricted manner, freely, so that all those who create or appreciate art—scholars, artists, art lovers, and entrepreneurs—will have greater access to high-quality digital images for their studies and projects. Art inspires us, and imagination and creativity lead to artistic expressions that expand knowledge and understanding. The Getty sincerely hopes that people will use the open content images for a wide range of activities and that they will share the fruits of their labors with others. Initially, the images available through the Open Content Program are of works in the J. Paul Getty Museum’s collections. Over time, images from the Getty Research Institute and the Getty Conservation Institute will be added. Museum images can be found on the Museum’s Collection webpages or on the Getty Search Gateway. Those available as open content images are identified with a “Download” link. Images provided are JPEG files at a minimum of 300 DPI. See the Guidelines for Successful Printing (PDF) for more information on file format. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog. This will be added to Entrepreneurial Resources Subject Tracer™.