CAFE face database
A subset of the CAlifornia Facial Expressions (CAFE) dataset, copyright 2001 by Matthew Dailey, Garrison W. Cottrell, and Judith Reilly. The database includes lots of different expressions and two normalized versions of each faces, one Gamma corrected and the other Histogram Equalized.
The link address is: http://www.cse.ucsd.edu/users/gary/CAFE/