[Chimera-users] Map to CCP4 Style Mask

Tom Goddard goddard at sonic.net
Fri Oct 20 09:48:51 PDT 2017

Hi Martin,

  The vop threshold Chimera command can set all the map values below a specified density level to 0, and all the values above that level to 1 creating a mask.  For example,

vop threshold #0 min 6.5 set 0 max 6.5 setmax 1

Then you can save the new map to a file with Volume Viewer menu entry File / Save Map... or command

vol #1 save ~/Desktop/mask.mrc


> On Oct 20, 2017, at 7:30 AM, Martin Lawrence wrote:
> Hi All,
> Is there a quick and easy way in Chimera to impose a density level cutoff and write out a ccp4 style mask file?
> Thanks,
> Martin
> Martin Lawrence
> Department of Chemistry and Biochemistry
> Montana State University
> Bozeman, MT 59717
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