Thanks. I basically did as described, clicking in the (old) preview to get 
a rough zero-placement and then finetuning by pasting the image's negated 
y/p/r values to the Numeric Transform boxes in the Preview. This had to be 
done a few times to stabilize it since everything is affected when the 
complete panorama is being moved around.

Perhaps a function "Center this image" could be added?

I need this sometimes to pre-stitch images where there's an ugly seam, to 
get an intermediate image which can be used to retouch one of the 
originals. So, pixel-perfect precision is necessary.

In this case I had a spherical pano which had some parallax error near the 
zenith where the ceiling has a hole to the upper floor. I had found an 
alternative optimization that solved this seam but destroyed the rest of 
the scene. So I stitched this alternative into a temporary rectilinear 
image centered on one of the original images as described above (one of the 
shots tilted 45 degrees up), then cloned the difficult parts from this into 
the original image (which I vertically expanded to include zenith) and gave 
it an alpha channel that shows the retouched stuff. Re-introduced it in the 
pano and masked out the same parts from the other images. Perfect!

Actually, ideally, lens parameters would also have had to be reset in the 
temporary stitch but that would be impossible since it was a spherical pano 
so instead I did a second temporary stitch between this temporary image and 
the original shot and "reversed" the lens distortions there to match the 
original. Then cloned from this into the original.

Here's the pano - a 100 years old derelict paper factory in Sweden. My most 
death-defying panorama yet! (Am I strange to see the beauty in such a 
place?)

http://www.elmuseum.se/panorama/panorama.html?pano=nyhamnstornet_plan3.xml

/John

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