[ccp4bb] imosflm background definition

2012-09-17 Thread Andreas Förster

Hi all,

I'm integrating data from a crystal with a fairly long axis.  In iMosflm 
(1.0.7), the background definition is so generous that plenty of pixels 
from adjacent peaks are included (see attached).  Can someone tell me 
how I redefine the background to be tighter around the spots?


Thanks.


Andreas


--
Andreas Förster, Research Associate
Paul Freemont  Xiaodong Zhang Labs
Department of Biochemistry, Imperial College London
http://www.msf.bio.ic.ac.uk
attachment: backgroundSpots.png

Re: [ccp4bb] imosflm background definition

2012-09-17 Thread A Leslie

Hi Andreas,

  The simple answer to this is that you do NOT  
attempt to redefine the background. Providing the additional spots  
shown in your image belong to the same lattice, mosflm will  
automatically exclude pixels from adjacent spots when doing the  
background plane fitting, so you need do nothing. It helps to have a  
larger box size because the background plane is better defined.



To answer your question, you need to go to Settings - Processing  
Options - Advanced integration  in imosflm, then the top 5 lines  
define the measurement box parameters, changing the box width and  
height should do what you want, although you may need to uncheck the  
box Optimise overall box size to stop the box being made bigger again.


Best wishes,

Andrew





On 17 Sep 2012, at 15:03, Andreas Förster wrote:


Hi all,

I'm integrating data from a crystal with a fairly long axis.  In  
iMosflm (1.0.7), the background definition is so generous that  
plenty of pixels from adjacent peaks are included (see attached).   
Can someone tell me how I redefine the background to be tighter  
around the spots?


Thanks.


Andreas


--
   Andreas Förster, Research Associate
   Paul Freemont  Xiaodong Zhang Labs
Department of Biochemistry, Imperial College London
   http://www.msf.bio.ic.ac.uk
backgroundSpots.png