[Chimera-users] mask

[Tom Goddard]

The mask command only sets values to zero.  Should have an option to specify the fill value.  But lacking that I suggest using “vop scale” to shift the map by 128 and make the new value type unsigned 8-bit assuming it is currently signed 8 bit (vop scale #3 shift 128 valueType uint8 model #4).  Then mask, then shift back if you prefer the signed values.  In ChimeraX I’ll make mask and erase operations capable of specifying a fill value different from 0.

	Tom


> On Jun 2, 2016, at 4:44 PM, Dougherty, Matthew T <matthewd at bcm.edu <mailto:matthewd at bcm.edu>> wrote:
> 
> I have a volume whose density values are -127 thru 127.  Zero is a valid density & approximately the peak of the Guassian distribution.
> 
> I would like to use the command mask.
> It sets the unmasked density values to zero.
> How can I set the unmasked density values to -128 using the mask command?
> Will I need to hack the code?
> 
> Matthew Dougherty
> National Center for Macromolecular Imaging
> Baylor College of Medicine
> =================================================
> =================================================
> _______________________________________________
> Chimera-users mailing list: Chimera-users at cgl.ucsf.edu <mailto:Chimera-users at cgl.ucsf.edu>
> Manage subscription: http://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users <http://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://plato.cgl.ucsf.edu/pipermail/chimera-users/attachments/20160602/4f5475b0/attachment.html>