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Unwanted Side Effect Of Noise Reduction


Tallmanirl 6 274 Ireland
18 Feb 2021 5:06PM
Hi guys!
I find when I reduce noise in a selected area, it tends to have an unwanted blending effect with the area not selected. E.g, if I want to reduce the noise in a sky, but not the building in the photo. I enclose a closeup of a steeple here where that has happened It's like there is a slight "glow" off the spire.

How do I fix or avoid this?


257670_1613668001.jpg

saltireblue Plus
10 11.6k 72 Norway
18 Feb 2021 5:15PM
It would help to know what software are you using...
Tallmanirl 6 274 Ireland
18 Feb 2021 5:47PM
Photoshop CC
18 Feb 2021 6:07PM
If you select the steeple and then invert the selection a blur will not be possible. It depends on how you select the area that needs noise reduction.
18 Feb 2021 6:33PM
In the first picture of Hereford Cathedral

273254_1613673040.jpg


I selected a small part of the left hand tower, then inverted it (which selects the surrounding sky) and then removed the noise.




18 Feb 2021 6:34PM
273254_1613673192.jpg


There is not blur on the tower. It depends how you select and and how precise your selection is.

But Personally I do not use PS noise reduction but Topaz Labs noise reduction and I usually find that if part of the picture has noise it all has noise.
Tallmanirl 6 274 Ireland
18 Feb 2021 6:53PM
Thanks guys!
I will try those. I had used the “select sky” option.
Dave_Canon 14 1.9k United Kingdom
18 Feb 2021 7:03PM
If you use Topaz Denoise AI there should be no need to select so you should not see this issue.

Dave
saltireblue Plus
10 11.6k 72 Norway
18 Feb 2021 7:15PM

Quote:If you use Topaz Denoise AI there should be no need to select so you should not see this issue.

Dave


Dave - even if you only want to treat part of the image?

Quote:I want to reduce the noise in a sky, but not the building in the photo.
Mike_Smith Plus
13 723 1 United Kingdom
18 Feb 2021 8:33PM
Topaz de noise, I find to be fantastic. I don’t know why you only want to apply it to part of a picture though
18 Feb 2021 9:21PM
If you use Topaz Denoise - whether it is AI or the original, it is designed to work on the noise it finds and not just do a blanket blur. Personally I much prefer the original Denoise - I found the AI was not as good (strange as that may sound to those that think it is fantastic). There are different modes Luma, Colour, Red and Blue each with their own sliders which can be moved similarly to the sliders in ACR - either way and independently of each other - and you can see when you move the slider whether it is improving the noise or not. There are also sliders for Light areas and Dark areas - quite often a darker area will have more noise than a lighter area. Balancing these sliders is the best way to get noise reduction which works for every picture in all areas. I have used it for very many years and have never found anything better.

I would say to the OP that quite often you will see the noise in a sky as it is less likely to have shapes/patterns/different shades of colour - all of which tends to obscure to the human eyes initial awareness of noise. DeNoise enlarges the image to 200% and then it is easier to see the noise throughout the image which is why I think it is not necessary to remove the noise only from one area i.e. why I never choose one area or select one area. This also to some extent answers Malc's question - DeNoise AI detects the noise in each area of the image and reduces it as necessary. When I use Denoise 'straight' the sliders which are 'dark' and 'light' give me the ability to change the noise reduction in an area according to the lightness/darkness, which AI does automatically.
Tallmanirl 6 274 Ireland
18 Feb 2021 10:08PM
Thanks guys!😀
sherlob Plus
14 3.2k 130 United Kingdom
19 Feb 2021 5:27PM

Quote:Dave - even if you only want to treat part of the image?


Yes Malc - it's impressive from an AI point of view, but if I recall you can apply masks if needed.
Dave_Canon 14 1.9k United Kingdom
19 Feb 2021 7:26PM

Quote:
Quote:Dave - even if you only want to treat part of the image?


Yes Malc - it's impressive from an AI point of view, but if I recall you can apply masks if needed.



Yes you can use a Mask with Topaz Denoise AI but i have not found it necessary. However I do sometimes use a mask with Topaz Sharpen AI.

Dave

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