[PyMOL] Coloring atoms by charge

Hi, Is there a way to color atoms by charge in PyMOL? Can PyMOL read the charges in a PDB file use those charges to color the atoms? Thanks, Kaushik.

[PyMOL] png error

I am attempting to have a script output a png image of a set of pdb files that I have in a directory. I can get the images out of pymol when using it in gui mode, but when I attempt to run in command line mode I get the following error: ScenePNG-WARNING: writing a blank image buffer. libpng e