DescriptionARTstor provides over 1.5 million digital images in the arts, architecture, humanities, and sciences, along with a suite of software tools for teaching and research. Collections include image contributions from outstanding international museums, photographers, libraries, scholars, photo archives, and artists and artists' estates. Users can search for images by keyword or browse images by geography, classification or collection. Search results can be sorted or narrowed. Images can be viewed using zoom and pan features. Registered users may print or download images. In addition, images may be organized and saved into groups; and image groups can be shared with other ARTstor users or batch downloaded for use in PowerPoint, KeyNote, or ARTstor's Offline Image Viewer (OIV). NOTE: registered users must be logged in to download images.