[chimerax-users] Re-scaling maps

[JAMES MICHAEL S1JJRUdFUiA=]

It probably depends what options you use for resizing. You can  
interpolate the same size grid with more smaller voxels (or fewer  
larger pixels) or just rescale the sizes of the voxel that are there  
such that the whole grid changes.

I'm not sure what relon_image_handler does but ChimeraX voxelSize  
seems to do the second one, which sounds like the one you probably want.

There are also ways to do various resizing operations in Scipion too  
in case you want to try that.

Best wishes
James

Tom Goddard via ChimeraX-users <chimerax-users at cgl.ucsf.edu> escribió:

> Hi Nebojša,
>
>   When you open a volume file ChimeraX reports the voxel size, for  
> example 2.7 Angstroms in the following example
>
> 	> open 1080 from emdb
> 	Opened emdb 1080 as #1, grid size 100,100,100, pixel 2.7, shown at  
> level 1.68, step 1, values float32
>
> Then if you wanted to change it use
>
> 	volume #1 voxelSize 2.5
>
> or you can use menu Tools / Volume Data / Map Coordinates and change  
> the voxel size entry in the panel that appears.
>
> 	Tom
>
>
>> On Jul 28, 2022, at 6:38 AM, Nebojsa Bogdanovic via ChimeraX-users  
>> <chimerax-users at cgl.ucsf.edu> wrote:
>>
>> Hello,
>>
>> I have two maps. One from cryosparc @ 1.06 A/pix and another EM-gan  
>> sharpened map @ 1.0 A/pix. They are different in size upon visual  
>> inspection in chimeraX so I tried relion_image_handler --i  
>> cryosparc.mrc --angpix 1.0 --rescale_angpix 1.06 --o  
>> cryosparc-rescaled.mrc however, the resulting map is still smaller  
>> than the original input. I also tried to rescale in this way to  
>> several different angpix values but maps are still not the same.
>>
>> Is there any command in chimeraX or chimera to play with pix sizes  
>> to find the right one?
>>
>> Thank You and regards,
>>
>> Nebojša Bogdanović, Ph.D
>> Department of Physiology and Biophysics,
>> School of Medicine,
>> Case Western Reserve University
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>
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