The Brandeis CCD detector has a raster size of 100 
m and 1024 by 1024 pixels.
The sensitive area is squared (not circular), and is a bit smaller: circa 95 by 95 mm.
If the spindle axis is coming from the right seen from the direction of the
direct beam), one should use a film rotation 90.0 in DENZO.
Let 
be the coordinates x beam y beam of the direct beam position
in millimeters on the image plate.
If there is no misorientation of the image plate ( cassette rotx roty rotz all equal to zero), the
relations between the pixel coordinates written to the new x-file
and the STRATEGY laboratory axes
are given by:
The display program that is part of the DENZO package, XDISPLAYF, will display the image
in the coordinate system 
with the origin in the upper left corner
of the image and the 
axis vertical. The pixel coordinates 
one gets when one clicks on an arbitrary position of the image are related to
the coordinates 
according to:
STRATEGY can deal with misorientations of the detector, but does not correct for any radial offset or angular offset.