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Re: [Imgcif-l] question on beam center
- To: "Miroslav Kobas" <miroslav.kobas@dectris.com>
- Subject: Re: [Imgcif-l] question on beam center
- From: "Herbert J. Bernstein" <yaya@bernstein-plus-sons.com>
- Date: Mon, 15 Oct 2007 16:12:16 -0400
- Cc: imgcif-l@iucr.org
- In-Reply-To: <6e899eda0710150954wdd5a11u49a6e11a6df4327e@mail.gmail.com>
- References: <6e899eda0710150954wdd5a11u49a6e11a6df4327e@mail.gmail.com>
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@dectris.com>miroslav.kobas@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 >________________________________________ > >Content-Type: application/octet-stream; name="run2_1_FH_00001.cbf" >Content-Disposition: attachment; filename="run2_1_FH_00001.cbf"; >filename="run2_1_FH_00001.cbf"; filename="run2_1_FH_00001.cbf"; >filename="run2_1_FH_00001.cbf"; filename="run2_1_FH_00001.cbf"; >filename="run2_1_FH_00001.cbf"; filename="run2_1_FH_00001.cbf"; >filename="run2_1_FH_00001.cbf"; filename="run2_1_FH_00001.cbf"; >filename="run2_1_FH_00001.cbf"; filename="run2_1_FH_00001.cbf"; >filename="run2_1_FH_00001.cbf"; filename="run2_1_FH_00001.cbf"; >filename="run2_1_FH_00001.cbf"; filename="run2_1_FH_00001.cbf"; >filename="run2_1_FH_00001.cbf"; filename="run2_1_FH_00001.cbf"; >filename="run2_1_FH_00001.cbf"; > filename="run2_1_FH_00001.cbf" >X-Attachment-Id: f_f7t7fn8h > >Attachment converted: Macintosh HD:run2_1_FH_00001.cbf ( / ) (001C5C25) -- ===================================================== 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@dowling.edu ===================================================== _______________________________________________ imgcif-l mailing list imgcif-l@iucr.org http://scripts.iucr.org/mailman/listinfo/imgcif-l
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