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clickhappy
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compression artifacts visible in sky

Thu Dec 20, 2018 1:25 am

Any suggestions on how to overcome a "compression artifacts visible in sky" rejection?

Image was shot at 1/500 f/8 ISO100 on a Nikon D850 - .NEF processed in Camera Raw. Of note is the uploaded file size was 864kb (the file you are seeing here). The rejected file was also the same size, so it does not appear any compression was added during submission.

Thanks

Royal

Image
 
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Runway28L
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Re: compression artifacts visible in sky

Thu Dec 20, 2018 5:17 am

Image

There appears to be some slight banding above the aircraft near the center of the sky from what I can see. The only time I've experienced such a thing is when too much noise reduction is added to the background. Not sure if that's the case here.

Edit: For some reason the link won't work with the full picture in posts.
Greetings from KPIT! Check out my photos here: https://www.airliners.net/search?user=45 ... teAccepted
 
Psych
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Re: compression artifacts visible in sky

Thu Dec 20, 2018 11:14 am

Hello Royal - a very long time, no speak! I hope all is good with you.

I am really struggling to see an issue here worthy of a rejection. If I look extra close, with the express purpose of finding some minor flaw, I can see very slight 'mottling' at top left of the sky, by the frame's border, which could be an editing artefact. But these things are almost unavoidable when editing, I find. I certainly wouldn't describe it as 'compression'.

You know me, I would appeal, as it feels a little harsh to my eye.

Take it easy.

Paul
 
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airkas1
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Re: compression artifacts visible in sky

Thu Dec 20, 2018 2:25 pm

The photo doesn't show for me, so here goes: https://imgproc.airliners.net/photos/ai ... 410f5ef9f5
I see some light banding going on in the sky, but otherwise looks fine. Not sure what the screener meant with 'compression artefacts'.

Psych wrote:
You know me, I would appeal, as it feels a little harsh to my eye.

Except that this was already the appeal result.
 
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clickhappy
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Re: compression artifacts visible in sky

Thu Dec 20, 2018 9:14 pm

All - Thank you for the feedback. As mentioned, the photo was rejected on appeal. I would really like to get this sorted as, in my mind, this sort of photo should be an easy acceptance. I suppose one way would be to upload at a smaller size? Not sure if that helps with compression. I've checked my Photoshop settings and the .jpeg quality settings are set to max. Is there anything else to verify? Color space or something?

Here is a link to the photo: http://www.fearofaflatplanet.com/images ... VH-VLH.jpg
 
Psych
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Re: compression artifacts visible in sky

Fri Dec 21, 2018 2:09 pm

I’m with you Royal - I think you have to work rather hard to find any flaw with this image, and what we’re talking about here appears to me to be minor in the extreme. It really leaves me unsure about whether what I am looking it is exactly the same as that which the screener is seeing, and harks back to my recent thread on monitors and the like ( viewtopic.php?f=7&t=1407007 )

Is it not the case that it is common to get very slight banding (only really noticeable using 'equalise' function) when taking a photo of a blue sky, dependent on the relative angle of the sun?

Cheers.

Paul
 
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clickhappy
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Re: compression artifacts visible in sky

Thu Jan 24, 2019 3:17 pm

Thank you to everyone who took the time to read and/or reply to this post. I decided to rework the photo from scratch (as with any rejection) and picked a slightly more side-on angle. The photo was screened and accepted.

 
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airkas1
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Re: compression artifacts visible in sky

Thu Jan 24, 2019 5:53 pm

Lovely as usual!

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