Hi Jean-Paul, Yes, the 2dlabels command has a "visibility" option to do exactly that, fade in or fade out over a specified number of image frames. You would need to use the 2dlabel command to create the label and give it a name, because the name is needed to specify which label you are changing. There is an example in the attached Chimera command file 1gfl.com -- it shows a title at the beginning that later fades out gradually. Just use File... Open in Chimera to execute its contents. It is just a plain text file of a few dozen lines, contents can be viewed here: <http://www.cgl.ucsf.edu/chimera/docs/ContributedSoftware/recorder/1gfl.com> See the 2dlabel command documentation for the full description. <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/2dlabels.html> I hope this helps, Elaine ---------- Elaine C. Meng, Ph.D. UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco