Hi Bertrand, It is an option of the “save” command (transparentBackground true), see: <http://rbvi.ucsf.edu/chimerax/docs/user/commands/save.html#image> Best, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco

On Aug 3, 2018, at 9:31 AM, bertrand beckert <bertrand.beckert@gmail.com> wrote:

Dear all, I have now been trying to use ChimeraX as a replacement for Chimera for making really nice images for publication. So far I have to say I really liked the rendering! definitely a really nice work! However I was really wondering how to get the background transparent... In Chimera we were able to set the background transparent as preference which is actually really useful... any idea how we can to do it in ChimeraX? Any help would be highly appreciated! Best Bertrand