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andy84
Topic Author
Posts: 36
Joined: Wed Feb 19, 2014 8:02 pm

Compression rejection

Sun Apr 18, 2021 7:14 pm

Good morning all, I had a bunch of rejection due to the compression but the workflow it's always the same once I have done with the editing, I save the file as .jpeg with the highest level of quality as stated and described in all the guide but sometime I get the "compression rejection" and I still not understand how to avoid it even after some reading of other thread and article.
Do you have any advices?
Thx
 
dutchspotter1
Posts: 461
Joined: Tue Jul 26, 2005 9:24 pm

Re: Compression rejection

Sun Apr 18, 2021 7:59 pm

Do you shoot in RAW? Can you post some examples of the rejected photos?
 
andy84
Topic Author
Posts: 36
Joined: Wed Feb 19, 2014 8:02 pm

Re: Compression rejection

Sun Apr 18, 2021 8:53 pm

Yes always in RAW.
This one was rejected due to compression for example

Image
Last edited by andy84 on Sun Apr 18, 2021 9:00 pm, edited 1 time in total.
 
JakTrax
Posts: 5267
Joined: Thu Jun 30, 2005 3:30 am

Re: Compression rejection

Sun Apr 18, 2021 9:00 pm

I can see compression/banding in the sky, top left/right of frame. I'm more surprised it didn't get the boot for overexposure as a few areas are blown out.
 
andy84
Topic Author
Posts: 36
Joined: Wed Feb 19, 2014 8:02 pm

Re: Compression rejection

Sun Apr 18, 2021 9:14 pm

in effect in the personal message from the screener, it was stated that there are compression in the upper left and right corner but what I don't understand is how to recognize it when I look the image. is that light black strip similar to a cloud?
I read the acceptance guide with all the examples of the rejection due to the compression but sincerely I don't see the difference between the images with high, low and medium compression
 
User avatar
HarryLi
Screener
Posts: 1055
Joined: Sun Jan 11, 2015 9:51 am

Re: Compression rejection

Fri Apr 30, 2021 1:09 pm

Hi Andy,
I can't access to the photo you posted above. One of the ways to recognize the compression is to check if there's "Pixel" feeling or effect on the photos. Typically can be observed in the sky and some colorful areas. You can experiment this by saving an identical photo with different saving standard to check.
Hope this helps.

Regards,
Harry
 
andy84
Topic Author
Posts: 36
Joined: Wed Feb 19, 2014 8:02 pm

Re: Compression rejection

Fri May 14, 2021 2:49 pm

Thx all. But what is cause the compression?

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