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EZEIZA
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Post Screening; Noise

Thu Jun 06, 2013 2:17 pm

Hi, this shot was rejected for noise/grain, wih a message saying "blotchy sky". What exactly does that mean, how to avoid it and how can I correct it? Yes, I know, a lot of questions lol. Thanks in advance!

https://www.airliners.net/addphotos/r...6_w1369489413.8792eclab_1edit2.jpg
 
dlowwa
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RE: Post Screening; Noise

Thu Jun 06, 2013 3:28 pm

Quoting EZEIZA (Thread starter):
Hi, this shot was rejected for noise/grain, wih a message saying "blotchy sky".

Yes, quite noticeable above the aircraft.

Quoting EZEIZA (Thread starter):
how to avoid it and how can I correct it?

If you're not shooting hi-ISO, then you're likely doing something in post-processing that is causing it. Surprisingly, some kinds of noise reduction can cause that kind of blotchy sky. Without knowing the exact details of your image and how you processed it, can't say much more.
 
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EZEIZA
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RE: Post Screening; Noise

Thu Jun 06, 2013 3:35 pm

Quoting dlowwa (Reply 1):
If you're not shooting hi-ISO, then you're likely doing something in post-processing that is causing it. Surprisingly, some kinds of noise reduction can cause that kind of blotchy sky. Without knowing the exact details of your image and how you processed it, can't say much more.

Thanks! it was a low ISO shot, 100, so that should not have caused it. I use neat image for noise reduction, could tha be it? if so, how come it can show up in some pictures and others not?
The rest of the processing is fairly standard for a normal sunny shot, slight level correction and some sharpening.

what does "blotchy" mean exactly?

rgds
 
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kulverstukas
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RE: Post Screening; Noise

Thu Jun 06, 2013 4:10 pm

Spotty. Like dalmatine dog  
 
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EZEIZA
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RE: Post Screening; Noise

Thu Jun 06, 2013 4:20 pm

Quoting Kulverstukas (Reply 3):
Spotty. Like dalmatine dog

great example lol 
 
vikkyvik
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RE: Post Screening; Noise

Thu Jun 06, 2013 4:21 pm

Quoting EZEIZA (Reply 2):
what does "blotchy" mean exactly?

Typically, larger adjoining areas of different brightness/color. Usually larger areas than typical luminance noise (grain).

Can also be caused by compression, or having strong brightness gradients (typically manifested as banding).

Quoting EZEIZA (Reply 2):
if so, how come it can show up in some pictures and others not?

That's a tough question to answer. Every shot simply isn't exactly the same.
 
dlowwa
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RE: Post Screening; Noise

Thu Jun 06, 2013 4:39 pm

Quoting EZEIZA (Reply 2):
I use neat image for noise reduction, could tha be it?

It could be. Try processing without Neat Image, and see how it turns out. I don't use any seperate noise-reduction plugins, but the only time I see banding/blotchiness in my own images is when I've set the noise reduction too high in ACR.
 
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EZEIZA
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RE: Post Screening; Noise

Thu Jun 06, 2013 7:53 pm

Quoting vikkyvik (Reply 5):
Typically, larger adjoining areas of different brightness/color. Usually larger areas than typical luminance noise (grain).

Can also be caused by compression, or having strong brightness gradients (typically manifested as banding).

thanks!

Quoting dlowwa (Reply 6):
It could be. Try processing without Neat Image, and see how it turns out. I don't use any seperate noise-reduction plugins, but the only time I see banding/blotchiness in my own images is when I've set the noise reduction too high in ACR.

the thing is I basically use NI for every single picture, and I very rarely get noise rejections. I'll try re editing without any noise reduction and see how it works out.

thanks all of you for all your help!  
 
vikkyvik
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RE: Post Screening; Noise

Thu Jun 06, 2013 8:30 pm

Quoting EZEIZA (Reply 7):
the thing is I basically use NI for every single picture, and I very rarely get noise rejections. I'll try re editing without any noise reduction and see how it works out.

If you're shooting at low ISO in decent light and not underexposing, you shouldn't need to use NR for every photo. I used to do that too, until I got better at exposing correctly, and realized I didn't really need to add much NR, if any.
 
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EZEIZA
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RE: Post Screening; Noise

Sat Jun 08, 2013 8:09 pm

Quoting vikkyvik (Reply 8):
If you're shooting at low ISO in decent light and not underexposing, you shouldn't need to use NR for every photo. I used to do that too, until I got better at exposing correctly, and realized I didn't really need to add much NR, if any.

great, thanks for the tip! it will save some time too lol

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