A problem with the sky  

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grzesczwa
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A problem with the sky

by grzesczwa » Mon May 14, 2012 11:14 am

Hello,

I'm Grzegorz from Poland. Recently I made a giga panorama out of 1053 photos in AutoPano. The panorama is available under this link: http://panoramaczestochowy.pl/spacery/czestochowa/Czestochowa_Gora_Ossona.html.

In my panorama the sky is not made properly. The sky consists of something like „squares”.
Thank you very much in advance for any advice how to solve my problem

Cheers
Grzegorz

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mediavets
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by mediavets » Mon May 14, 2012 12:29 pm

grzesczwa wrote:In my panorama the sky is not made properly. The sky consists of something like „squares”.
Thank you very much in advance for any advice how to solve my problem

Welcome to the forum...

I think that is probably due to vignetting.

http://toothwalker.org/optics/vignetting.html

http://en.wikipedia.org/wiki/Vignetting
Last edited by mediavets on Mon May 14, 2012 12:30 pm, edited 1 time in total.
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by klausesser » Mon May 14, 2012 8:04 pm

mediavets wrote:[

I think that is probably due to vignetting.

I agree - but i guess color-correction should easily handle that. I remember it was very effective once . . :cool:

best, Klaus
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by leifs » Mon May 14, 2012 9:21 pm

I don't know what it is, but it does not look like vignetting.
It has some repeating patterns. How is it shot? A rig with several cameras ?

leifs


Last edited by leifs on Mon May 14, 2012 9:41 pm, edited 1 time in total.
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by lumelix » Tue May 15, 2012 8:06 am

Kind of camera(s) and sensor ? Amount of overlaping ? Postprocessing of images ?
It looks like there are two different exposures and very small overlapping.
Regards
Martin

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by AlexandreJ » Tue May 15, 2012 12:21 pm

Yes, strange. I also doubt it is vignetting, but whatelse ...

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by grzesczwa » Tue May 15, 2012 5:04 pm

All images were taken with the parameters

Camera: Canon 600D
ISO: 200
Exposure time: 1/250
Aperture: 11
Lens: Canon EF 70-300mm f/4.0-5.6 IS USM set to 300 mm
GigaPan EPIC Pro
Last edited by grzesczwa on Tue May 15, 2012 5:07 pm, edited 1 time in total.

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by vklaffehn » Tue May 15, 2012 6:21 pm

I have the same effect on my panoramas as seen here :
http://vklaffehn.vk.funpic.de/cms/index.php?option=com_content&view=article&id=52:test&catid=35:meine-panoramabilder&Itemid=53
Shot like most of my panos with a Canon PowerShot 590is, but if I remember correctly, these patterns weren't so strong in earlier versions of APG, maybe I try an older version to see the difference. I played with the multiband level, but its always quite visible.

MfG
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mediavets
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by mediavets » Tue May 15, 2012 6:43 pm

grzesczwa wrote:All images were taken with the parameters

Camera: Canon 600D
ISO: 200
Exposure time: 1/250
Aperture: 11
Lens: Canon EF 70-300mm f/4.0-5.6 IS USM set to 300 mm
GigaPan EPIC Pro

Do you see the same effect when you stitch using the Gigapan Stitcher software?

Gigapan Stitch.efx claims to have a feature that specifically handles vignetting:
http://www.gigapan.com/cms/shop/software/gigapan-stitch-efx
Last edited by mediavets on Tue May 15, 2012 10:02 pm, edited 1 time in total.
Andrew Stephens
Many different Nodal Ninja and Agnos pano heads. Merlin/Panogear mount with Papywizard on Nokia Internet tablets.
Nikon D5100 and D40, Sigma 8mm f3.5 FE, Nikon 10.5mm FE, 35mm, 50mm, 18-55mm, 70-210mm. Promote control.

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grzesczwa
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by grzesczwa » Tue May 15, 2012 6:47 pm

I do not use this software Gigapan Stitcher

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by leifs » Tue May 15, 2012 8:46 pm


This is more like vignetting.
The bands at the short side is more prominent than at the long side and there is a dark area in all the corners.

leifs


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by vklaffehn » Tue May 15, 2012 9:33 pm

Ok, I see the difference. Leifs, could you please tell how you have created those images? Would be helpfull to do that on my own :-) Just increasing contrast and convert to b&w?

MfG
Volker Klaffehn

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leifs
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by leifs » Wed May 16, 2012 9:36 pm

vklaffehn wrote:Ok, I see the difference. Leifs, could you please tell how you have created those images? Would be helpfull to do that on my own :-) Just increasing contrast and convert to b&w?

MfG
Volker Klaffehn

I don't know if this is the ultimate way to explore vignetting, but it works. I do it like this:
- open the image in Photoshop 12 (CS5)
- image -> adjustments -> gradiant map
- choose preset = Black, White
- move the lower slider to the right (e.g. location=40%)

There it is

leifs
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by grzesczwa » Tue May 22, 2012 6:53 am

I sent the photo files to the server problem_with_the_sky.zip
Last edited by grzesczwa on Tue May 22, 2012 10:38 am, edited 1 time in total.


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