On the subject of larger image sizes, I had a question a while back; I'd like to know if it's been addressed or anyone has a quick(er) workaround-
Basically, is there in inverse to the viewport command?  i.e., if I manually resize the Pymol window to fit around the molecule I'm displaying, how can I get the relative dimensions of the new window?  These dimensions are needed for the Ray command to keep proper perspective.  What I've done in the past is save a small image of what's displayed in the window, used a graphics program to determine the x & y dimensions, and then used these to generate a high-resolution ray traced image with the same x/y ratio.
I figure I'm missing something.
David A. Horita, Ph.D.
Department of Biochemistry
Wake Forest University School of Medicine
Winston-Salem, NC 27157-1016
Tel: 336 713-4194
Fax: 336 716-7671
email:  dhorita@wfubmc.edu
web:  http://www1.wfubmc.edu/biochem/faculty/Horita.htm