How do I remove Vignette at the zenith?  

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thomash
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How do I remove Vignette at the zenith?

by thomash » Wed Feb 10, 2010 7:46 pm

Hello, I'm a first time user. I'm using a Nikkon P6000 with the FC-E8 converter lens which is 0.21x. It has a lot of vignetting. with Autopano Giga demo version, zenith gets the vortex effect and the vignette is still up there. LDR doesn't fix that dark spot.

PTgui does a good job of removing the vignetting but clouds don't blend good. If I use smartblend with PTgui, the clouds are better but the vortex appears.

Examples below
http://www.thomashuang.net/test/autopano.html
http://www.thomashuang.net/test/ptgui.html
http://www.thomashuang.net/test/ptguisb.html

http://www.thomashuang.net/test/photos.7z
(uploading, might take a few minutes)

Is there a way fix this in Giga?

Thanks!
Thomas

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gkaefer
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by gkaefer » Thu Feb 11, 2010 12:15 am

Hi Thomas,

welocme to the forum!
if I review your examples and in special to the nadir, I looks to me that something in your setup (cam position on panohead and tripod) does not fit.

here in following example the effect is quit similar to your nadir:
http://www.easypano.com/forum/display_topic_threads.asp?ForumID=1&TopicID=4162

autopano docu:
http://www.autopano.net/wiki-en/action/view/Adjusting_or_verifying_a_panohead

an howto setup panohead to avoid parallax errors describes John (posting #2) in following thread:
http://www.autopano.net/forum/viewtopic.php?pid=57455#p57455

to retuch the nadir - ronalds classical posting in autopano forum:
http://www.autopano.net/forum/t6821-editing-nadir-shots-without-photoshop

about vignette at zenith...
do you shoot one image at zenith or do you shoot 3-5 images at 70degree? I think to remember some postings that later version gets less errors between neigbor pictures and in combination with smartblend vignetting should be solved.

perhaps - Im not sure - the problems with setup causing errors at nadir cause the problems at zenith too?

PS: little bit more info about your setup, like version using, OS using with or without GPU enabled number of pictes and rows etc.

Liebe Gruesse,
Georg

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thomash
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by thomash » Thu Feb 11, 2010 6:17 am

Hello,
I'm using a monopod with a leveler, and a Bo Bracket wooden bracket made for the FC-E8 lens.
http://www.bophoto.com/bracket/
Autopano Giga 2.06, win xp, gpu enabled.

I see that the images are not rotating exactly at the optimal point. They're offset a little, but that's because the bracket is a 3/8" thread, and the monopod is 1/4". I ordered an adapter on the internet but it didn't arrive before my trip, so I made my own, which is tilted to the right by a few degrees, so you see that the images are misaligned. I did not shoot patch shots because I just wanted to take quick photos and didn't think about it at the time. It's alright, I will put a logo or something else on the nadir. The zenith is more important to me though. The vortex is most likely also due to the misalginment. I think the smartblend plugin in both software is set with a sharp blend instead of feathering, so you get those sharp "vortex" effect, while PTgui's own blender uses a smoother blend. I should be able to remove the vortex in photoshop, but I want to get rid of the dark spot that I get with APG because its very large, bigger than the vortex.

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klausesser
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by klausesser » Thu Feb 11, 2010 3:09 pm

thomash wrote:Hello,
I'm using a monopod with a leveler, and a Bo Bracket wooden bracket made for the FC-E8 lens.
http://www.bophoto.com/bracket/
Autopano Giga 2.06, win xp, gpu enabled.

I see that the images are not rotating exactly at the optimal point. They're offset a little, but that's because the bracket is a 3/8" thread, and the monopod is 1/4". I ordered an adapter on the internet but it didn't arrive before my trip, so I made my own, which is tilted to the right by a few degrees, so you see that the images are misaligned. I did not shoot patch shots because I just wanted to take quick photos and didn't think about it at the time. It's alright, I will put a logo or something else on the nadir. The zenith is more important to me though. The vortex is most likely also due to the misalginment. I think the smartblend plugin in both software is set with a sharp blend instead of feathering, so you get those sharp "vortex" effect, while PTgui's own blender uses a smoother blend. I should be able to remove the vortex in photoshop, but I want to get rid of the dark spot that I get with APG because its very large, bigger than the vortex.

Hi Thomas!

I use a workaround for mishappened Nadir- or Zenith shots:

put the rendered equi into CubicConverter which generates cubic-faces. I save the bottom-face as TIFF and open it in Photoshop.
Here i retouch it resp. close the hole and copy it back into CubicConverter. Then i save it as equi again and have a complete picture for use
in APT or else.

Of course there are many ways to make cubic-faces from a rendered equi.

best, Klaus
Simplicity is the keynote of all true elegance. Coco Chanel


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