Stripes/artefacts during sunrise

[herkots]

Hi,all!

 

I recently have discovered that my sunrise/sunset have strange color artefacts, kind of parallel stripes in the sky. They form the same angle round angle as the sun. Using different raw converters get the same results (but I must say that Iridient handles them better). When decreasing the exposure, the artefacts come out more and start to "move" across the sky when I add or decrese exposure.

 

Is this normal and how to avoid these during photographing sunrise/sunset?

 

Example is done using Xpro2 and 18-55mm, I decresed the exposure quite a lot to get the artefacts out more. Also have tried 14mm and with or without nd-filters. But the result is similar.

 

Thanks,

Herkko

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[mdm]

Honestly I see nothing.

[herkots]

Ok, here is a better example. As I now only see the stripes, I also notice them when they are really lightly seen;)

 

 

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[milandro]

that is nothing but normal in digital photography and hardly a feature of Fuji cameras.

 

It's called color banding.

 

There are many resources on line which talk about it and offer workarounds but some of it is built in the digital technique itself. 

 

https://en.wikipedia.org/wiki/Colour_banding

 

https://fstoppers.com/post-production/learn-how-fix-color-banding-using-just-one-simple-tool-7946

 

more on it...

 

http://www.hdrshooter.com/2015/01/09/dealing-with-color-banding/

Edited January 23, 2017 by milandro

[herkots]

Thank you for your help:) Didn't know anything about banding yet..

 

Herkko

Edited January 23, 2017 by herkots

[mdm]

What color space did you set Adobe RGB or sRGB? Such artefacts might be seen on computer monitor screen if you use Adobe RGB.

[Rand47]

Do you see the banding (color compression) on screen "before" your raw file is exported as a jpeg?

 

If so, it may be a function of your monitors lack of color gamut. The broad (and relatively even) tonality shift from light to dark in a sky is especially prone to showing "compression" on a narrow gamut monitor - AND in being cooked into a jpeg as the broad gamut of the sky is compressed on conversion.

 

What is happening is that the "very many" shades of color (for simplification) in the file don't fit into srgb and get moved (piled up together) to fit. This is what creates the visual bands. A demosaiced raw file viewed on a wide gamut monitor will show none or very little of this effect (most wide gamut monitors approach full AdobeRGB 1998 gamut capability).

 

Unfortunately, if we only display our images on the web, they get "jpeg-ed" and the compression is obvious a lot of the time. One way to minimize this is to make sure that when you apply sharpening that the sky is appropriately masked. If this isn't sufficient, you may actually want to apply some negative clarity to the sky to smooth the blend a bit.

 

As mentioned in the previous post, bit depth also has a significant impact on this.

 

Rand

Edited January 25, 2017 by Rand47