On Wed, 9 May 2007, Vanacore, Roberto M wrote:

What are the system requirements to run -bgopacity option in a windows machine?

I've tried adding to option (--bgopacity) to the startup command but I can not get a transparent background

I'm using Chimera 2.2199

Thanks!

Roberto

So you don't say if you're the integrated graphics of your computer or if you have a graphics card. My guess is the former. If you're not using a notebook computer and can add a graphics card, I expect that any current graphics card from NVidia or ATI will support the --bgopacity option (midrange graphics cards, $100-$200, give the best price/performance). FYI, you can also turn on background opacity using the Tools / Viewing Controls / Effects dialog and changing the transparent background toggle to true -- it works when --bgopacity works and vice-versa. For Windows, to see the capabilities of your graphics setup, download <http://www.cgl.ucsf.edu/home/gregc/wglinfo.exe> and run it inside a Command Prompt window. If there are any non-zero numbers in the a/sz column, then your graphics supports --bgopacity. Linux/Mac X11 users can use the glxinfo program to find out the same about their graphics setup (it's the colorbuffer/a column). Greg Couch UCSF Computer Graphics Lab