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Load the images. JPEG, PNG, TIFF, HDR, EXR, etc. are supported formats.
In the 'Images' tab, select align_image_stack as the control point generator. It's spesifically used to treat stacks of images as in this case.
It takes some time to run as align_image_stack generates up to several thousand control points in the images we use.
Back in the 'Assistant' tab hit 'Align', and Hugin starts to determine the image positions. It also does compulsory vignetting correction which we DO NOT want.
Hit 'Preview'. As you can see Hugin corrected the barrel distortion. Let's crop the black borders out.
Now we head to 'Camera and lens' tab to undo the vignetting correction. In 'Photometric' tab put zeroes in the vignetting fields.
Done.
Tick the upmost boxes in 'Exposure fusion' and 'HDR' categories and save your image.
First, Hugin runs the 'nona' app. It simply warps the images from one projection to another.
Then runs 'enfuse'. It merges the exposures to one image with extended dynamic range. Additionally it can do noise reduction...
... by averaging images together and/or depth of field expansion by edge masking.
Then Hugin executes app called 'hdr_merge' which creates 32 bit HDR image(s) for further processing in QtPFSgui or Photomatix.
Enfuse result, looks quite dull now but is very good billet for further processing.