Scanning white-light interferometry is widely used for the microstructure a
nalysis of technical and biological specimens. For each pixel in the focal
plane of the apparatus a white-light interferogram is acquired and evaluate
d by means of an algorithm. We discuss some properties of mathematically op
timal evaluation methods and the best possible achievable resolution derive
d therefrom depending on the setup parameters. A comparison of the results
to one of the algorithms described in the literature is given. (C) 2001 Opt
ical Society of America.