[chimerax-users] Interactive map sharpening and filtering?

[Tom Goddard]

This is just like ChimeraX Gaussian filtering which does a convolution with a Gaussian in Fourier space.  That is relatively fast — a few seconds for a 256**3 map.  You can already do sharpening with the “invert” option to the gaussian filtering command (“vol gaussian #1 1.5 invert true”).  Gaussian filtering is one form of low pass filtering — others could be added.  I think it would be nice to allow a very fast (10 updates per second) test filtering on a small region using a mouse drag to figure out the desired parameters.  But I never spent to the time to figure out a user interface (what small region, how do you undo, how do you then apply to full map, …).

	Tom


> On May 6, 2017, at 10:27 AM, Oliver Clarke <olibclarke at gmail.com> wrote:
> 
> Hi,
> 
> Has any consideration been given to adding the capacity for fourier-space map sharpening/low pass filtering to ChimeraX? I’m not sure whether or not it is feasible speed wise, but if it is it would be a very useful addition for EM, allowing one to easily try different sharpening B-factors/low pass cutoffs and save the resulting map(s).
> 
> Cheers
> Oli
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