4
edits
Finding out ORGX ORGY: Difference between revisions
Jump to navigation
Jump to search
multiply, not divide
No edit summary |
Simoncaulton (talk | contribs) (multiply, not divide) |
||
| Line 6: | Line 6: | ||
# visualize BKGINIT.cbf (from [[INIT]]), or FRAME.cbf (from [[COLSPOT]]) with [[XDS-Viewer]], and click (left-mouse) into the middle of the beamstop shadow (or the attenuated direct beam itself, if it is recorded). Use the pixel coordinates displayed by [[XDS-Viewer]] as ORGX ORGY (in principle you should add 1 to both numbers, because for XDS-Viewer the pixels go from 0 to NX-1 whereas for XDS they go from 1 to NX).<br />Instead of these files written by XDS, one could directly use a measured frame. (If XDS-Viewer does not know the format, it will ask for NX, NY, and the size of the header. The latter is usually <size of frame in bytes>, minus 2*NX*NY .) | # visualize BKGINIT.cbf (from [[INIT]]), or FRAME.cbf (from [[COLSPOT]]) with [[XDS-Viewer]], and click (left-mouse) into the middle of the beamstop shadow (or the attenuated direct beam itself, if it is recorded). Use the pixel coordinates displayed by [[XDS-Viewer]] as ORGX ORGY (in principle you should add 1 to both numbers, because for XDS-Viewer the pixels go from 0 to NX-1 whereas for XDS they go from 1 to NX).<br />Instead of these files written by XDS, one could directly use a measured frame. (If XDS-Viewer does not know the format, it will ask for NX, NY, and the size of the header. The latter is usually <size of frame in bytes>, minus 2*NX*NY .) | ||
# use [[adxv]] for visualization. Otherwise the same as with XDS-Viewer. (1.9.7beta version works for the PILATUS detector at SLS) | # use [[adxv]] for visualization. Otherwise the same as with XDS-Viewer. (1.9.7beta version works for the PILATUS detector at SLS) | ||
# use MOSFLM for visualization. It prints out X BEAM and Y BEAM from the frame header, and you may click on the hypothetical direct beam position. However, ''x and y are swapped in MOSFLM when compared to XDS'', and the coordinates are in mm, not in pixels (so one has to | # use MOSFLM for visualization. It prints out X BEAM and Y BEAM from the frame header, and you may click on the hypothetical direct beam position. However, ''x and y are swapped in MOSFLM when compared to XDS'', and the coordinates are in mm, not in pixels (so one has to multiply by QX). Sometimes the X BEAM and Y BEAM from the header are not reliable. | ||
# use ice rings to find out (in [[XDS-Viewer]], and with paper and pencil) where the direct beam would be. This should be rather accurate but may be tedious. | # use ice rings to find out (in [[XDS-Viewer]], and with paper and pencil) where the direct beam would be. This should be rather accurate but may be tedious. | ||
# use the Unix command line tools to look at the header of the frame. E.g. "strings <frame-name>|more" would should you the (hopefully correct) information stored in the header, like wavelength, delta-phi, X and Y beamcentre and so on. | # use the Unix command line tools to look at the header of the frame. E.g. "strings <frame-name>|more" would should you the (hopefully correct) information stored in the header, like wavelength, delta-phi, X and Y beamcentre and so on. | ||