strange problem with stitching  

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Hellkeeper
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strange problem with stitching

by Hellkeeper » Wed Jan 26, 2011 12:00 pm

Hello,

just stitched a new Gigapixel (15 Gigapixels) with the latest 2.5 Beta - and the image looks a bit weird. Like if there is massive vignetting - but at our older shoots such problems never arrised - using the same lens and camera. (and I guess vignetting can't arise just the other day?!?)

Here a crop of actual picture
Image
Image

Here links to older stitchings - without the problem
http://www.gpix.at/Gpix.at-Gigapixel_gpath,kufstein,pid,9112,type,gpix.html
http://www.gpix.at/Gpix.at-Gigapixel_gpath,kitzbuehel,pid,9112,type,gpix.html

Any idea what the problem could be?

Thank you, greetings from Austria
Andreas
Last edited by Hellkeeper on Wed Jan 26, 2011 1:25 pm, edited 1 time in total.
Gigapixel Panos from Austria: gpix.at

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AlexandreJ
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by AlexandreJ » Wed Jan 26, 2011 1:03 pm

The crop doesn't seems to work.

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Hellkeeper
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by Hellkeeper » Wed Jan 26, 2011 1:21 pm

ops - corrected link - should work now
Gigapixel Panos from Austria: gpix.at

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AlexandreJ
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by AlexandreJ » Wed Jan 26, 2011 2:33 pm

So, this is typical of vignetting on the lens. The solution is to use Camera Raw to remove vignetting before using them in autopano.

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GURL
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by GURL » Wed Jan 26, 2011 3:38 pm

Hellkeeper wrote:(and I guess vignetting can't arise just the other day?!?)

Vigneting depends on lens aperture setting, it's often clearly visible when a lens is wide open but disapears at about two stops from this aperture.

In your example vigneting should be visible on source images.
Georges

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Hellkeeper
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by Hellkeeper » Fri Jan 28, 2011 12:46 pm

Hi,

guess you are right with "lens wide open aperture vigneting" - this gpix was shot by a colleague and he forgot to stop down the lens :-(
Removed the vigneting with Lightroom + lens profile - but Autopano won't stitch em again - always crashes with this error message:

Image
(critical error, happens at stage "color matching", 3. try now)

bye
Andreas
Last edited by Hellkeeper on Fri Jan 28, 2011 12:50 pm, edited 1 time in total.
Gigapixel Panos from Austria: gpix.at

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AlexandreJ
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by AlexandreJ » Fri Jan 28, 2011 12:52 pm

This error can arise when having a wrongly optimized panorama and doing color correction on that.
So process in step : uncheck color correction, do detection, see if everything is okay ( geometrically ). Then enable color correction.

My guess in this case is that you lost exif in input file, then you go a bad panorama.


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