I would like to know how to make the background of Chimera-generated images transparent . I used to be able to do this with an older version of Chimera. But with Chimera 1.8, I could not figure out how to do this. There are options in the 'Color/Background' to adjust 'Opacity', which to me means that I could make the background transparent by using 'zero'. But this did not happen. Could you please advise?