[3dem] diffraction data: negative counts on OneView Cammera

[Tim Gruene]

Dear all,

I received some diffraction data sets collected with a Gatan OneView detector 
in binning mode (512x512 pixels). The images contain many negative counts, at 
least according to Fiji and to Matlab. Would anyone have an explanation for 
this?

I did ask for as raw as possible data. Without flatfield/darkfield correction, 
however, I would still not expect negative counts.

The data are 32-bit. Since there are negative counts along the beam stop, I 
would also rule out misinterpretation of the data as signed instead of 
unsigned.

I would appreciate some ideas, as to how a camera could produce negative 
counts. 

Best regards,
Tim

-- 
--
Tim Gruene
Head of the Centre for X-ray Structure Analysis
Faculty of Chemistry
University of Vienna

Phone: +43-1-4277-70202

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