vertical brightness alterations in blue sky  

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MartinFranz
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vertical brightness alterations in blue sky

by MartinFranz » Tue Jan 20, 2009 9:39 am

There are alterations of brightness in the blue sky, probably at the overlapping borders of the photographs.

These example pictures are stitched together from about 25 exposures. Nikon D70, 55 mm Micro-Nikkor at F 16 or 22. Exposure M
Overlapping between the shots is approximately 1/3. The time for exposing the pano was approx. 1 min.

Rendering is with smartblend with default setting (Minimal Pyramidal 4, Transition smooth 0)

APP V 1.4.2

How can I prevent or minimize these problems?

Martin





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fma38
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by fma38 » Tue Jan 20, 2009 10:09 am

Try multiband. It may give bad results in the trees, so you may have to use PS to combine both images...
Frédéric

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GURL
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by GURL » Tue Jan 20, 2009 1:35 pm

MartinFranz wrote:F 16 or 22. Exposure M.
The time for exposing the pano was approx. 1 min.

If exposure values were identical for every shot in the series then using "NONE" as color mode is OK.

If exposure variations occurred and EXIF are available then be sure to use "LDR" color mode and have a look at the yellow anchor placement APP selects (if, for some reason, EXIF data are not available you should adjust brightness until the different shots are matched.)

Multiband is not as good as Smartblend is to hide vignetting but at F/16 or F/22 vignetting should not be visible.
Last edited by GURL on Tue Jan 20, 2009 1:42 pm, edited 1 time in total.
Georges

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MartinFranz
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by MartinFranz » Thu Jan 22, 2009 3:12 pm

the problem is solved. It was a selfmade problem:
As I shot in manual mode, I set "none" as color correcion mode. Ithought it was a good idea, because I did not want to change the carefully adjused colors of the original shots. However slight brightnes variation became visible in this mode.

When I tried "LDR" the blue sky became smooth and the problem was solved.

As I worked in 16 bit mode, the finetuning of the colors of the final panorama was no problem.

Thanks for help!

Martin

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gcarr
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by gcarr » Mon Jan 26, 2009 7:20 pm

Martin - what is LDR? I familiar with HDR. Is it part of photoshop or did you set it in your camera?
Gary
Last edited by gcarr on Mon Jan 26, 2009 7:46 pm, edited 1 time in total.

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by DrSlony » Mon Jan 26, 2009 7:40 pm

Low Dynamic Range, also one of the color correction methods in APP.

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by jmardy » Tue Jan 27, 2009 5:18 pm

There is some very good information on this subject here:
http://www.autopano.net/wiki/action/view/Color_and_Brightness

:-)


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