I noticed the same kind of effect when trying to do non panorama HDR 
with vignetting correction enabled.
Did you tried without the vignetting correction?

esby  / Y. Tennevin

icysubdweller wrote:
> I'm wondering if anyone could give me a couple pointers on using
> Enfuse.  I decided to try it for the first time today, and you can see
> what happened by looking at the file "enfuse_fairy_ring.jpg" that I've
> uploaded.
>
> I put my camera on a tripod in my living room and was shooting towards
> the window in natural light.  I metered a proper exposure on the back
> of the couch at 2.5 secs at f5.6.  Up in the top left corner of the
> window (sky with branches) the meter said 1/1600th sec at f5.6.  It's
> a total difference of 10 EV.  I snapped 5 pictures, spaced somewhat
> unevenly through that exposure range.  When I blended them with Hugin,
> I went ahead and used autopano-sift-C to generate a few control points
> between the images (max of 8 points between each pair of images), and
> after that, I added a few other control points myself where I thought
> they might be useful.
>
> Then I stitched the images with the following process:
> 1.  On the Optimizer tab, I just clicked the "Optimize Now" button
> with whatever was the default.  It reported good alignment between all
> the images with average distance of 0.15 pixels.
> 2.  On the Exposure tab, I selected the "High dynamic range, fixed
> exposure" option on the menu and clicked "Optimize Now."  It reported
> what seemed like a large number (in the 25 range), but I didn't know
> what to expect, so I ignored that and went on.
> 3.  On the Stitcher tab, I pressed the Calculate the Field of View and
> Optimal Size buttons.  Then under Exposure Blending, I selected only
> the "Blended panorama (enfuse)" option... it was the only one of the
> boxes selected, nothing under Normal or Merge to HDR... and in File
> Formats area, I set both the Normal and HDR settings to TIFF.  Then I
> clicked "Stitch Now."
>
> And you see the result in the file "enfuse_fairy_ring.jpg".
>
> So... can anybody tell me what likely went wrong that produced that
> mondo bizarre artifact?  Is 10 EV just too wide an exposure range to
> expect good results from enfuse?  Is my method incorrect?  Do I even
> need control points to use enfuse, or does Hugin just ignore them?
> Or, even if Hugin doesn't ignore them, can I skip that step and JUST
> use enfuse and forget about perspective correction?  Do I need to
> select different options for the Optimizer, Exposure, or Stitcher tabs
> to get the best results?
>
> Thanks for any help you can give me!
> Rodney
>
>
>
>
> >
>
>
>   

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