Hi Tom, Elaine Thanks for your replies - very helpful! I followed one of the links from Elaine's email: http://ami.scripps.edu/prtl_data/mrc_specification.htm Does this actually mean that pixel size is not provided in MRC file? Could you also perhaps comment on how chimera recognizes the density files with inverted order of bytes? Thanks in advance Alex Quoting "Tom Goddard" <goddard@sonic.net>:
Hi Alex,
Chimera reads the voxel size and map grid size from the headers of each of the volume file formats it reads. Often the correct voxel size is not given in the files and is set to 1.0. If it the file has zero (or negative) for the voxel size than Chimera uses of size of 1. You can change the voxel size within Chimera using the volume dialog Coordinates panel. Then you can save a new file with the volume dialog File / Save Map As... menu entry.
Tom
Hallo
Perhaps, this has been on the forum before, but I could not find the answers to my questions: 1. Some EM density maps have a header. I wonder how Chimera recognizes it and calculates map dimensions? 2. Does chimera take default voxel size from header of EM file?
Thanks in advance Alex
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---------------------------------------------------------------------- Alexander Shkumatov, predoc -- Biological Small Angle Scattering Group EMBL Hamburg Outstation c/o DESY -- Building 25A Notkestraße 85 -- 22603 Hamburg -- Germany tel: +49 40 89902 178 fax: +49 40 89902 149 Email: shkumatau@embl-hamburg.de ----------------------------------------------------------------------