hugin is clipping black holes in HDR image (exr) in the shape of masks 
(inclusive).
http://img691.imageshack.us/img691/7232/windowshot2011011009392.png

LDR image looks just fine though.

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https://bugs.launchpad.net/bugs/678694

Title:
  EXR files quietly clipped (black rectangles in output)

Status in Hugin - Panorama Tools GUI:
  Confirmed

Bug description:
  The EXR file format has a maximum encoding value of 65504.   The Hugin data 
flow maintains the absolute exposure through use of the Ev field which 
effectively scales pixel values.   When using Hugin/Nona on an HDR series that 
includes very bright elements (such as a very bright sky with a very short 
exposure), some pixels end up with values above 65504.   When these are written 
out by Nona, those pixels are written as NaN's in the EXR output file. 

If enblend is then used, the problem is further exacerbated.   A single NaN 
pixel results in NaN for entire rectangle of enblend's pyramids.   The end 
result are large black rectangles in the output file.

If output is changed to TIFF, then everything works fine.

Nona should warn when clipping occurs and then output the maximum possible 
value rather than a NaN.   I assume this is the OpenEXR library itself and 
probably affects other applications.   In fact, if a TIFF generated as above is 
opened in PhotoShop, it looks fine, but if it is resaved as EXR, the same NaN 
pixels are created.



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