I am afraid that I am doing something wrong with Hugin 2019.3.0 and cannot find what it is… After more than a week of redoing and retrying without success I can do with some help.
The project is a HDR panorama consisting of 9 horizontal about 30% overlapping pictures, each bracketed at 0 EV, -2 EV and +2 EV. All 27 pictures are 16-bit TIFFs (each about 182 MB). Every row has the same settings (aperture, ISO) and vary in shutter speed only. The pictures were taken with a tripod and a remote so each bracketed set is pixel accurate on top of each other.
Loading the 27 pictures in Hugin and creating 9 stacks is easy (the exposure settings calculated using aperture, shutter speed and ISO of each row is the same - as it should be). Running the control points sets about 1200 control points and they look OK. For the top row, the 0 EV row, I set the vertical lines of the major buildings (far away). Setting field of view and one can stitch the panorama.
Now comes the curious bit. The top 0 EV row stitches correctly and cannot find any errors; no ghosting, buildings/towers are straight etc in the TIFF. The result is 23713 x 4294 pixels.
The fused version however is totally unusable: the first/left 30% is OK, then parts are shifted, a small centre area is OK, then more horizontal shifts (eg. a church tower, some distance and the tower appears again, chimneys have ghosts to the left and right) and the last 5% is correct again. The intermediate files (exposure layer) of each stack has the same deformation so the final results should be on top of each other.
So the 0 EV result is correct but the fused version has these heavily shifted bits. Why? And what should I have to do to prevent that from happening?
And can one modify the fusion process (bit more of the +2 EV, and a bit less of the -2 EV layers)?
Any help is appreciated.