PC-CS Panorames with tilted cameras bend upwards

HR
Posted By
harald_rupp
Jan 7, 2004
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422
Replies
5
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Closed
Hi,
am I taking the panorame funtion of PS-CS too far?
I took a series of about 40 overlapping wide-angle shots, looking down from a TV tower. When I tried to stich them together, the pictures fell more and more out of alignment. I had to rotate the pictures slightly at increasing angles to get them matching.
Now the horizon is bending into a circle. Am I doing something wrong?
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JR
John_R_Nielsen
Jan 7, 2004
That will happen when the camera is tilted, Ideally, you’d want to take the pictures with a’perspective correction’ lens, one which can shift up and down. This moves the image up and down, but keeps the veticals from converging.

These lenses are not available for every camera, so you may not be able to get one for yours. What I would do is to use the crop tool with the ‘Perspective’ option to make sure the verticals are parallel.
MV
Mathias_Vejerslev
Jan 7, 2004
The Panorama tool in Photoshop and Elements is rather ‘dumb’. If you are serious about this kind of thing, IĀ“d recommend better software, such as PTAssembler / PanoTools.
HR
harald_rupp
Jan 7, 2004
Yep, just started using Panotools. Not easy to handle but *very* powerful. But Adobe is close with the panorama function, a few improvements and might actually be usable…
S
SimRacer
Jan 7, 2004
wrote in message
Hi,
am I taking the panorame funtion of PS-CS too far?
I took a series of about 40 overlapping wide-angle shots, looking down
from a TV tower. When I tried to stich them together, the pictures fell more and more out of alignment. I had to rotate the pictures slightly at increasing angles to get them matching.
Now the horizon is bending into a circle. Am I doing something wrong?

Yes, you can’t really do decent panoramas like this unless 1) You use a tripod, level that tripod, then mount the camera, and level that camera as well or 2) Use a PC lens (perspective correcting) lens, also known as a tilt lens or what have you.

To get good panos, one pretty much has to keep the ‘film plane’ level or else you will get funky curved lines at the overlaps or in the horizon (as you have found here). You also need to shoot them from the exact same point, which a tripod will allow you to do while just rotating your head or body, will not.

Honestly though, a high viewpoint pano like you are trying to create, especially if you used a wide angle lens (say 28mm or wider (smaller mm number) in 35mm equivalent) then the horizon *should* bend slightly.
CC
Chris_Cox
Jan 16, 2004
harald — we’d love to get a sample of those pictures so we can improve PhotoMerge in the future.

If they’re small, email them to
If you need to send a CD or DVD, email and ask him for shipping information.

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