strong banding in cloudy sky regions

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strong banding in cloudy sky regions

Postby Erik Krause » Mon Aug 27, 2012 5:40 pm

I'm just experimenting with SNS-HDR lite 1.4.22 as a preplacement for enfuse. I found strong vertical banding at an 8 pixel interval in cloudy sky regions. Since it is very severe in slightly misaligned images I suspect this is simply due to misalignment. Source images are 16 bit TIFFs converted from EOS 5DII raw files. No banding is visible in these files not even at strong contrast. Parameters are -da -natural -tiff16. Using -dd sometimes improves the situation but only gradually. I also tried feeding raw images directly to SNS-HDR using raw noise reduction with same result.

Is this a known problem? If needed I can probably prepare a test case...

If this could be improved SNS-HDR would be the very first choice for all kind of bracketed shots.

(sorry for posting to the wrong forum previously)
best regards
Erik
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Re: strong banding in cloudy sky regions

Postby Sebastian Nibisz » Mon Aug 27, 2012 9:06 pm

Please show me the sample images.
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Re: strong banding in cloudy sky regions

Postby Erik Krause » Mon Sep 10, 2012 8:27 pm

Sorry for being late...

Here is a 100% crop of the (otherwise unmodified) result. Source images are in 16 bit TIFF format.
Attachments
_MG_1271_SNS.jpg
Banding in cloudy sky.
_MG_1271_SNS.jpg (140.43 KiB) Viewed 4904 times
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Re: strong banding in cloudy sky regions

Postby Sebastian Nibisz » Mon Sep 10, 2012 9:18 pm

Show me also 100% crop of the original image.
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Re: strong banding in cloudy sky regions

Postby Erik Krause » Thu Sep 20, 2012 6:59 pm

These are 100% crops of the three source images
Attachments
_MG_1273.jpg
_MG_1273.jpg (1.67 KiB) Viewed 4882 times
_MG_1272.jpg
_MG_1272.jpg (59.55 KiB) Viewed 4882 times
_MG_1271.jpg
_MG_1271.jpg (62.55 KiB) Viewed 4882 times
Erik Krause
 
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Re: strong banding in cloudy sky regions

Postby Raiko » Thu Sep 20, 2012 7:45 pm

Hi Erik,

i take this Source Pictures and change the exposure.
For example i take the Image _MG_1272.jpg and use with FSViewer the Autocolor.

And also there i see this vertical Banding, SNS-HDR reinforced therefore they are not visible failure of the source images.

Raiko
Attachments
_MG_1272_autocolor FSViewer.jpg
_MG_1272_autocolor FSViewer.jpg (181.66 KiB) Viewed 4880 times
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