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How to remove "vignetting" ?
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PostPosted: Mon Sep 14, 2009 8:46 am    Post subject: How to remove "vignetting" ? Reply with quote
Question to PS specialists:

When I shoot my panoramas I sometimes don't want to miss to use a polarizer filter, bacause of all the clarity and great saturnation etc. it gives. When a polarizer filter is used with wide panoramas it happens often that a "inside vignetting" is present, especially noticeable in the blue sky.

Does anybody know how to easily remove this "inside vigneting" with PS?

The only possibility I could think of was to go with a gradient against it. I played around with the gradient till I tweaked it to the opposite of my orig. sky-gradient.
All this costed me about 30min. time, and that's not the way of workflow which I prefer Wink
Still the result is not perfect, another 30min. I think will be necessary to tweak it ...

I would be greatful if anybody knows a better solution how to do this ... Smile


before




after




Cheers
Tobias


PostPosted: Mon Sep 14, 2009 9:12 am    Post subject: Reply with quote
First, I'm not a fan of filters but I do understand why one would use a polarizing filter. However, polarizing filters are best avoided for panoramas because with extreme panoramas, this means that you'll get shots with a considerable darker sky and also shots with a lighter sky (because you're then positioned to the sun that the polarizer has no effect).

Can't the polarizing effect be recreated in PP? Just an idea.


PostPosted: Mon Sep 14, 2009 9:24 am    Post subject: Reply with quote
Something to add: your PP actually has minimized the polarizing effect in the sky, so you could easily do without the filter I think?


PostPosted: Mon Sep 14, 2009 5:06 pm    Post subject: Reply with quote
Hi Peter, thanks very much for your thoughts !

Quote:
However, polarizing filters are best avoided for panoramas because with extreme panoramas, this means that you'll get shots with a considerable darker sky and also shots with a lighter sky (because you're then positioned to the sun that the polarizer has no effect).


that's out of question, but still as I said I don't want to miss to use a polarizer even with wide panoramas.


Quote:
Can't the polarizing effect be recreated in PP? Just an idea


I definitly think: no. That falls in same category as e.g. some people think they can immitate bokeh in PS.

extreme example for polarizer use (no reflections in water etc., can't be immitated in PS):

(one of my "early" panoramas, sorry sky looks terrible)

Quote:
Something to add: your PP actually has minimized the polarizing effect in the sky, so you could easily do without the filter I think?


Actually I am not so fond of the effect a polarizer does on the sky, because this effect (darkend sky/whiter clouds) is to obviouse for the spectator. One easily can identify a photograph which is done with a polarizer by wathching the sky - it's a bit cheap to say: "I use a polarizer because I want darker sky" Wink
BUT I am very fond of what a polarizer is doing with anything else than the sky, my motive etc.

So, the PP example which I gave shows what I want to achieve, ... and the question is how to achieve this result faster then the PP-technique which I used.

Cheers
Tobias


PostPosted: Mon Sep 14, 2009 5:49 pm    Post subject: Reply with quote
Hi Tobias,

perhaps you try "NIK VIVEZA" form nik software.

Look at www.niksoftware.com

With this PS Plug-in you can select and change every color in a specified area.
Cost approx. 150 €.

Regards


PostPosted: Mon Sep 14, 2009 5:55 pm    Post subject: Reply with quote
How to remove vignetting in Photoshop?

Filter --> Camera Distortion Control --> Vignetting (amount, midpoint adjust)


PostPosted: Mon Sep 14, 2009 6:24 pm    Post subject: Reply with quote
i think that the effect of a polarizer (in the sky) can also look fine on panos if the darkest area is situated at the edge of an image!

so if the darkest area isn't situated right, you just have to move the sun a bit! this should be much easier than postprocessing in ps! Laughing Laughing Laughing


PostPosted: Mon Sep 14, 2009 6:30 pm    Post subject: Reply with quote
by the way...

with a pf you will always produce images that show things, that human eyes would not see naturally. so in my opinion i wouldn't die to show a perfect natural sky in an image that shows colors human wouldn't perceive like that and structures that are normaly covert by reflections.

perhaps you find the happy medium, using the pf!?


PostPosted: Sat Mar 06, 2010 12:16 pm    Post subject: Reply with quote
I've found for landscapes, you can easily shoot of a few frames RAW or JPG and throw them into a High Dynamic Range programs to output a HDR photo. I took this back in 2007 in Istanbul. It's a bit small, but my Hard Disk crashed last year taking most of my photos with it.





I forgot which HDR software I used, but there's better ones out there now.


PostPosted: Sat Mar 06, 2010 12:46 pm    Post subject: Reply with quote
Esox lucius wrote:
How to remove vignetting in Photoshop?

Filter --> Camera Distortion Control --> Vignetting (amount, midpoint adjust)


+1

The polarizer is the only filter you can not recreate in PS.
I would process the images for vignetting before stitching, like Vilhelm said. You can also create a photoshop action if the needed vignetting amount is the same.

The only problem is the different intensity of the polarizer, depending from the angle to the sun.


PostPosted: Mon Mar 08, 2010 11:09 pm    Post subject: Reply with quote
+2 but it is the intensity of the polarized light in dependency of the polarizing angle of the filter. Maximum effect usually is 90 degrees to the sun axis.
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