On 29 Jan., 14:07, Doug <[email protected]> wrote:

> Meanwhile I've tried a last resort, chickening out of doing
> everything at once, and settled for fusing each stack as an
> individual hugin session (having removed sky points) -
> obviously not very practical if I'd had a lot of stacks
> instead of only six! -  and then running a separate session
> to blend the fused images together. That finally produced a
> decent result.

This does indicate that you had interstack control points between more
than only one image per stack. Maybe you'll have to doublecheck on
your use of the control point generator parameters in your settings,
as explained in the help (quote from hugin help on Hugin Parameters
for Control Point Detectors dialog):

"Panorama with stacks

This setting is intended for panoramas with stacks. In the first step
it selects the image with the median exposure of every stack. Then it
tries to match these median exposed images. After this step all image
stacks should be connected.

Then it tries to connect the images of every stack by using the
program given under Detector for stacks.

When your panorama does not contain stacks, it's does the same as All
images at once."

Creating a panorama from fused stacks does nothing other than first
fusing the stacks and then stitching the fused stacks together.

> Five of the six stacks fused individually as simple
> panoramas without problems, but the sixth - on the
> right-hand edge of the picture, much to my surprise, as I
> would have expected the problem to lie with the middle
> stack(s) - took quite a bit of effort to bring it into good
> register. I had to unlink the images, set each image a new
> lens, and optimise for y,p,r,X,Y,Z and v (having tried
> optimising fewer parameters first unsatisfactorily).

As you see, the possibilities are endless... hugin is a complex tool
and takes a while to get to know - and it does have odd and annoying
quirks as well. But if you get it to do what you want done, the
results are often very good.

> The three bracketing images would have been taken within a
> fraction of a second of one another, seeing that the camera
> was set to AEB and continuous shooting, so I can't imagine
> what would have been able to go wrong in such a brief interval!

Think of how you can easily spoil an exposure by shaking the camera in
as little as 1/10 of a second.

 Kay

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