Roger Broadie wrote:
You tell us you don't want to transform the first image at all. Therefore, use
it as the anchor, with all its parameters zero and non-optimisable.
Keep the lens parameters as imported, with, in the example I tried, just an fov
and use a single lens.
Yep; guessed all that (good to have it confirmed).
Optimise the second image for yaw, pitch and roll. That superimposes the
second image on the first as they sit in Hugin.
Agreed.
Now switch to the Stitcher tab and click Calculate optimum size (it may be
possible to do so earlier, but I haven't tried). Having done that I reoptimise
and normally get a bit of a shock at the greater errors announced by the
optimiser now the output size is greater.
Ah - I thought Optimize size did something like a 75% scale down!
But I didn't test my assumption. My bad.
I applied the above to a couple of group photos taken from the same spot and
then got Hugin to output its version of the anchor image. I found it
superimposed pixel-for-pixel on the original, though with a fringe where the
size did not quite match because I cropped within Hugin.
That's it!
In the group photos I then applied masking to select the heads I preferred
(giving the same effect as using the fuse function in Microsoft Photo Gallery,
if I dare mention that). But combining the images in an editor,
as I think you intend, is probably the better approach.
Yes, that was my intention - it clearly introduces no sampling degradation
whatsoever to image 1.
Nonetheless it may be worth outputting both images from Hugin and working with
those because they will already be in register.
Even my lowly skills can register two "perfect" images in Gimp!!
Trivial improvements in optimisation could be achieved by allowing other
parameters to vary for the non-anchor image, but in the example I tried they
had no noticeable effect on the end result.
Thank you!
BugBear
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