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I'm trying to understand what Autopano Giga is doing here. I took this with a Gigapan Epic Pro, I'm importing the photos with the Gigapan plugin. To simplify things I'm importing a single layer of fused exposures. My detection settings are set to defaults (standard quality, 50 control points / pair, etc.) and my optimization settings are set to the Gigapixel preset. I'm not doing any color correction or anything yet. The top row gets horribly out of alignment. I realize the blank sky has nothing to create control points on, but it seems to me that using row/column shooting with an import plugin should preserve rotation and alignment of the images with the rest of the grid? PTGui Pro's align to grid feature and then optimization handles this top row perfectly, but I don't like the blending as well as AutoPano Giga's. I've tried many different combinations of detection and optimization settings, but I can't get the top row to look any better than this. Any tips or ideas?
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Here is a much more difficult panorama imported with the same settings, and this one with brackets too! The images seem to project along a grid just fine without control points. Odd the previous one would give me so much grief.
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Hi
Try out the first optimization without the "correction of lens distortion".
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aaronpriest wrote:
I've tried many different combinations of detection and optimization settings, but I can't get the top row to look any better than this. Any tips or ideas?
Are any of the links to/between images in the top row valid? If not remove them.
In any case if the images in the top row are truly featurles does it matter how precisely they may or may not be positioned?
What sort of result do you get with the Gigapan Stitcher?
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Martin's suggestion made a big difference, thanks!
Andrew, it was introducing darker and brighter areas along the horizon where the corners of the rotated images were influencing the mountain range.
So this brings up a good question: I do lens distortion and vignetting correction in Lightroom before exporting. What sort of optimizations should be disabled in my group settings? Both first and final lens distortion corrections? What do local approach and first and final optimizations do? I've never quite understood what each of things accomplishes in spite of reading the online documentation.
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Hi
If you correct lens distortion first outside APG then you should deaktivate the "Lens distortion correction" in APG.
Otherwise, APG try to do this again with the EXIF-informations, resulting in a worse RMS.
APG isn't able to correct vignetting at the moment. This should be done first with other software.
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Martin, which lens distortion corrections should I deactivate? First, final, or both?
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Hi
If you deactivate it in the upper part of the setting box, it's automatically deaktivate in the lower part.
But at the end, all "lens distortion correction" checkboxes should be deactivated.
I try it out also with externally corrected images and found, that APG try to do it again.
And then, the reachable RMS get worse and the images are "over-corrected".
An other result are this desorientated images in the upper row without links.
But if you do not correct the images externally, APG can do it really accurate.
In this case, normally you should use "identical influence", because you shoot a long and fixed lens without change the focus distance.
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Thanks for the clarification!
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Hi Aaron,
for difficult-to-stitch panos there is a small tutorial...
http://www.autopano.net/wiki-en/action/ … zard_Cases
I had similar cases like yours, and yes, rtfm helped me 
greetings from germany
Chris
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