Unwanted Side Effect Of Noise Reduction
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?
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?
It would help to know what software are you using...
Photoshop CC
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.
In the first picture of Hereford Cathedral
I selected a small part of the left hand tower, then inverted it (which selects the surrounding sky) and then removed the noise.
I selected a small part of the left hand tower, then inverted it (which selects the surrounding sky) and then removed the noise.
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.
Thanks guys!
I will try those. I had used the “select sky” option.
I will try those. I had used the “select sky” option.
If you use Topaz Denoise AI there should be no need to select so you should not see this issue.
Dave
Dave
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.
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
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.
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.
Thanks guys!😀
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
