USC-SIPI Image Database  
   A collection of digitised images in TIFF format. Catalogue in PDF. Previews and images free on-line, database on magnetic tape can be purchased.
   http://sipi.usc.edu/services/database/Database.html

CMU Computer Vision Images  
   List of sites (intended for computer vision use) from CMU.
   http://www.cs.cmu.edu:80/afs/cs/project/cil/ftp/html/v-images.html

The Visible Human  
   The Visible Human Project has many medical images.
   http://www.nlm.nih.gov/research/visible/visible_human.html

Image Processing: the Lena Story  
   The history of one of the most well-known test images: Lena Sjooblom.
   http://ndevilla.free.fr/lena/

The Japanese Female Facial Expression Image Database  
   Database of facial expression images freely available for research purposes.
   http://www.mis.atr.co.jp/~mlyons/jaffe.html

The Lenna Story  
   Information about Lena Soderberg (née Sjööblom) and the history of the famous test image.
   http://www-2.cs.cmu.edu/~chuck/lennapg/