Hi Abhik,

Assuming you're talking about a ramp-colored surface. You can update the ramp 
from the "C" color menu (e.g.: C > grayscale), or from the command line:

PyMOL> ramp_update yourramp, color=grayscale

See also:
https://pymolwiki.org/index.php/Ramp_New

Cheers,
  Thomas

> On Oct 13, 2018, at 1:58 PM, Abhik Ghosh Moulick <abhik.gh...@bose.res.in> 
> wrote:
> 
> I have generated protein contact potential image using pymol. Where red
> color is showing color of negative charge and blue is showing color for
> positive charge. But want to change both color to black and grey. How it
> can be done. Please help.
> Thanking you
> Regards
> Abhik

--
Thomas Holder
PyMOL Principal Developer
Schrödinger, Inc.



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