Crystallography Online: the website of the International Union of Crystallography

Dear Miro,

    The problem is not what I like, but what processing programs can
deal with.  In the last round of proposed dictionary changes, we
suggested:

# _diffrn_data_frame.center_fast
# _diffrn_data_frame.center_slow
# _diffrn_data_frame.center_units

which would allow you to specify the center in mm, pixels or bins.
What we need now is general agreement on this approach.

    I am forwarding this message to the imgcif list to see if anyone
objects.

    Regards,
      Herbert



At 6:54 PM +0200 10/15/07, Miroslav Kobas wrote:
>Dear Herbert,
>
>I think that Andy Arvai has already contacted you concerning this 
>topic. It is about the fullCBF header. I have made a recent dataset 
>available on our webpage (<http://pilatus.web.psi.ch/datasets.htm> 
>http://pilatus.web.psi.ch/datasets.htm) with the miniCBF and the 
>fullCBF header (conversion done with convert_minicbf). After 
>experiencing some problems with adxv, I asked Andy, Harry Powell, 
>Jim Pflugrath to adapt their programs such that they take all the 
>necessary information from the CBFheader.
>
>Andy had problems with the definition of coordinate systems and how 
>to get the beam center (units of mm) into a know coordinate system 
>(in units of pixels).
>
>These are the 3 lines defining the beam center in units of mm in the 
>full CBF header:
>_diffrn_data_frame.center_slow 225.406000
>_diffrn_data_frame.center_fast -211.577200
>_diffrn_data_frame.center_units mm
>
>For our detector, they correspond to the following beam center in 
>units of pixels:
>slow 225.406000 corresponds to y at 1310.50
>fast -211.577200 corresponds to x at 1230.10
>
>This conversion can only be done, if one understands the definition 
>of coordinate systems properly. I have asked several people who have 
>experience with CBF if they understand how the coordinate systems 
>are defined, but they could no give me a unified solution.
>
>Andy has asked me to include the following lines in our header:
>_diffrn_data_frame.adxv_beam_center_x 2463
>_diffrn_data_frame.adxv_beam_center_y 2527
>
>But since we really head now for the standard, full CBF-header (Eric 
>is implementing the full CBF-header into our dataformat), we only 
>want to use items, which are defined therein. Therefor I have 
>suggested Andy to ask you, if it would be possible to add 2 more 
>items in the CBF header giving the beam center in x and y. Something 
>like:
>_diffrn_data_frame.beam_center_x 2463
>_diffrn_data_frame.beam_center_y 2527
>
>What do you think about that? The consequence would be that there 
>would also be changes in convert_minicbf and and in our header 
>structure. Eric has told me that it is not a problem for him to 
>include additional items in our header. But I would easily 
>understand that you would not like to include these items in the 
>full CBF header, since this information is already there in a 
>slightly different form.
>
>If you want to check the above values, I have attached you one of 
>our recent images with the full CBF-header.
>
>Thanks for everything and have a nice day.
>kind regards
>miro
>
>--
>________________________________________
>Dr. Miroslav Kobas
>DECTRIS Ltd.
>OSRA 007
>5232 Villigen PSI
>Switzerland
>
><mailto:miroslav.kobas at dectris.com>miroslav.kobas at dectris.com
><http://www.dectris.com>http://www.dectris.com
><http://pilatus.web.psi.ch>http://pilatus.web.psi.ch
>+41 56 310 3269 phone
>+41 56 310 5454 fax
>________________________________________
>
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-- 
=====================================================
  Herbert J. Bernstein, Professor of Computer Science
    Dowling College, Kramer Science Center, KSC 121
         Idle Hour Blvd, Oakdale, NY, 11769

                  +1-631-244-3035
                  yaya at dowling.edu
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