Help with vignetation :(  

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Mehlsack
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Help with vignetation :(

by Mehlsack » Sat Apr 06, 2013 9:22 am

Hello Guys

I made a Gigapixel Panorama and wanted to print it for my living room. Sadly i do have a problem with dark areas in the sky, which in my opinion are from vignetation. In Addition to that i have some areas, where it whitebalance seems a bit of. But i locked it when taking the pictures.

This Link will lead you to the panorama.

http://www.gigapan.com/gigapans/5fc715a4311ad58c65e6c9740ba722f9

Any help would be greatly appreciated.

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klausesser
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by klausesser » Sat Apr 06, 2013 11:16 am

Hey Max!
Which lens did you use? Which aperture did you use? Did you use a sunshade?
What were your optimizer-settings for stitching - which lens-correction model did you use?
Did you pre-process the images in another application?

You´re welcome - but some more informations would be needed for answering in a helpful way . . . ;-)

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

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gkaefer
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by gkaefer » Sat Apr 06, 2013 12:47 pm

try the method Alexandre suggested for the sky part here:
http://www.kolor.com/forum/p114417-2013-04-04-17-18-27#p114417

Georg

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Mehlsack
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by Mehlsack » Sat Apr 06, 2013 3:28 pm

Hello Thanks for all your answers so far.

1.Pentax K5
2. 18-135 DC
3.f11
4. Sunshade = yes
5.havent been processed before APG

I will now try to remove the vignetation with a pentax tool, which is supposed to know alle the right values for correction with this lens/camera combination

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klausesser
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by klausesser » Sat Apr 06, 2013 3:40 pm

gkaefer wrote:try the method Alexandre suggested for the sky part here:
http://www.kolor.com/forum/p114417-2013-04-04-17-18-27#p114417

Georg

Georg - i appreciate Alexandre´s effort . . . but i guess it´s up to APG to produce an evenly "nice" sky - as long as the lens doesn´t vignette too heavy. Does it?

Shooting @f11 usually doesn´t provide any vignetting of a kind that could NOT get compensated in a stitcher (but i don´t know Mehlsack´s lens. I had images in APG which produced comparable results as for Mehlsack. I stitched them successfully in PTGui - WITHOUT ANY vignetting.

I very well remember earlier days with AutoPano Pro when vignetting wasn´t an issue at all - using the VERY SAME 85mm lens as i use today.
I remember also to having been very excited about clear blue skies rendered absolutely free from darker and brighter areas.

best, Klaus
Last edited by klausesser on Sat Apr 06, 2013 3:42 pm, edited 1 time in total.
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klausesser
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by klausesser » Sat Apr 06, 2013 3:41 pm

Mehlsack wrote:Hello Thanks for all your answers so far.

1.Pentax K5
2. 18-135 DC
3.f11
4. Sunshade = yes
5.havent been processed before APG

I will now try to remove the vignetation with a pentax tool, which is supposed to know alle the right values for correction with this lens/camera combination

Max- is that a lens for DX or for FX?

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

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Mehlsack
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by Mehlsack » Sat Apr 06, 2013 4:41 pm

its an APS-C Lens ( coverted to Nikon Commercial Language DX), but i do had to same thought at F11 there SHOULDN'T be any vignetation :S

Did anybody looked at the link to gigapan.com? maybe it isn't due to vignetation?

I just dont get it right now :S

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mediavets
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by mediavets » Sat Apr 06, 2013 7:24 pm

klausesser wrote:I very well remember earlier days with AutoPano Pro when vignetting wasn´t an issue at all - using the VERY SAME 85mm lens as i use today.
I remember also to having been very excited about clear blue skies rendered absolutely free from darker and brighter areas.

best, Klaus

That was before Kolor introduced the all-new V3.x blender, I think?
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klausesser
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by klausesser » Sat Apr 06, 2013 8:09 pm

mediavets wrote:
klausesser wrote:I very well remember earlier days with AutoPano Pro when vignetting wasn´t an issue at all - using the VERY SAME 85mm lens as i use today.
I remember also to having been very excited about clear blue skies rendered absolutely free from darker and brighter areas.

best, Klaus

That was before Kolor introduced the all-new V3.x blender, I think?

Yeah - was Smartblend then . . . interesting thought, Andrew!

best, Klaus
Last edited by klausesser on Sat Apr 06, 2013 8:09 pm, edited 1 time in total.
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by lumelix » Sat Apr 06, 2013 8:53 pm

Mehlsack wrote:Did anybody looked at the link to gigapan.com? maybe it isn't due to vignetation?

Hi
Nice panorama.
The banding on the left side looks clearly like vignetting.
With most lenses you have visible vignetting up to f16.
And APG don't correct vignetting at the moment.
Depending on how the blender settings are, the vignetting is suppressed better or worse.
But in a clear sky it is always slightly visible.

The white balance spot (yellow shift) near the middle can be a flare from the sun.
You can see it also in the lower images, not only in the sky.
If you are using color correction in APG, then may be the anchors are the cause.

I would try to correct only the vignetting with the pentax tool.
Then stitch it in APG and use the default blender settings, LDR color correction (gamma, color) and one anchor in the middle.
Regards
Martin

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con
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by con » Mon Apr 08, 2013 6:41 pm

remove the vignetting from the source jpgs by using a lens profile correction, most adobe products have very sophiticated lens distortion reversals


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