[Chimera-users] How to invert a map values in UCSF Chimera

[Elaine Meng]

Dear Junha Song,
You can use "vop scale" with a negative factor value:
<https://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/midas/vop.html#scale>

For example:  vop scale #2 factor -1

Also, if you're interested in switching to ChimeraX, it has the same function as "volume scale":
<https://rbvi.ucsf.edu/chimerax/docs/user/commands/volume.html#scale>

I hope this helps,
Elaine
-----
Elaine C. Meng, Ph.D.                       
UCSF Chimera(X) team
Department of Pharmaceutical Chemistry
University of California, San Francisco

> On Oct 31, 2022, at 10:42 AM, Junha Song BA via Chimera-users <chimera-users at cgl.ucsf.edu> wrote:
> 
> Dear RBVI,
> 
> I am currently looking into the ways to invert a map in UCSF Chimera so that I can flip the histogram of a map, but I cannot find a volume operation command that does the job. What command in UCSF Chimera allows creating a map with inverted map values? I thought it was vop but I cannot find a parameter that allows assigning negative value operation that would invert the map in UCSF Chimera command line documentation. 
> 
> Best,
> Junha Song.