solved. Matthew Dougherty National Center for Macromolecular Imaging Baylor College of Medicine ________________________________________ From: Dougherty, Matthew T Sent: Saturday, December 21, 2013 7:41 AM To: chimera-dev@cgl.ucsf.edu Subject: volume rendering & histogram Hi, I was trying to develop an HID for volume rendering. How do I get access using python to the color and density values. I would like to read them and modify their values for color and threshold. I also would like to read the values for the histogram. Matthew Dougherty National Center for Macromolecular Imaging Baylor College of Medicine