[Chimera-users] Representation of volume data in memory

Thomas Goddard goddard at cgl.ucsf.edu
Tue Jan 30 15:10:38 PST 2007

Hi Jeff,

   Chimera keeps volume data in memory using the same numeric value 
types that are present in the file, for example, 32-bit float, 16-bit 
integer, 8-bit integer.

   Volume data is copied only when necessary -- for instance, using the 
Gaussian Filter tool creates a floating point copy of the data since 
Gaussian convolution of integer data produces a floating point result.


Jeff wrote:
> does chimera store all values as float internally (even if the original 
> map is in 2 byte integers), making the mode of the MRC file irrelevant 
> to chimera's performance?
> -jeff

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