Denoise make noise...bug

I accidentally noticed a bug that the denoise ADD color chromium noise…
I open a image in PS from ACR in color space - rec2020, and if we apply denoise to such image it will add color noise.
settings do not matter, even the small value like 6-11 add chroma noise…
If you open a photo in the usual sRGB, then there are no problems…
Please fix it


Note to screenshots:
Please open the files on the Fullscreen with the maximum brightness of the screen backlight to see the noise.
file called +AI is use a denoise to rec2020.
AfterAI - is a denoise applyed after conversion to sRGB.

Topaz Photo AI [v3] on [Windows]

Which Photoshop plugin are you using where you are seeing this shift:

  • File > Automate > Topaz Photo AI
  • Filter > Topaz Labs > Topaz Photo AI

@john.topazlabs * Filter > Topaz Labs > Topaz Photo AI

Would you mind sending in some more information to get a better understanding of the problem you are having with this particular type of image? Please send the following information:

  1. The original image file.
  2. The processed image.
  3. A screenshot or description of the settings panel so I can see what adjustments were turned on.

You can securely submit your image(s) to my Dropbox using the link below.

Dropbox File Request

Please be sure to send me a note to let me know you sent something.

@john.topazlabs t’s such a small noise that the only thing I realized is that it’s only visible in deep shadows.

  1. and 2. unfortunately this is a customer photo that cannot be published. Of course, I post this original from the start if i can…
    but I have attached a screenshot of what the original picture looks like. it’s called NOAI.
    you can take this piece and use it for the test… yes, since it is compressed, there will be a little less noise, but it will still appear. Almost not visible, but it still appear there, just zoom in and look at it in the dark with the maximum brightness of the screen. I just checked this right now with this screenshot…
  2. I already described in the first post, because the problem is not in a specific image but in rec2020! the settings do not matter, i wrote it. I used denoise ONLY.

again you are trying to make simple things too complicated, I already said in my post that the problem is in the color space! rec2020, open any 10 photos with deep shadows and good dynamic range, it’s better if it raw files, and zoom in deep shadows to 300+% at maximum monitor brightness, in dark room… maybe not in all photos, but noise will definitely appear, this is not the only one case .
even if the noise in your photos is will be too small, this will be especially noticeable when comparing the same photo, but srgb, then you will definitely understand that where there should not be colored noise, and was not there initially - it appeared.
You can also create a layer in PS with a brightness of 100-150 (not merging, but with the option to turn it off), if the photo is too dark, for a better noticeable. apply denoise and open the history of actions to see before/after. very easy.

I took photos from open sources and repeated what I described above. I repeated this in 3 minutes, on the first photo, without selecting a “special” one. I just took a photo where there are deep shadows… I’m attaching files and screenshots.

I opened the photo without changing any settings, with profile - matrix.


Canon-eos-r5-raw-00003.cr3 (37.0 MB)

Thanks for sharing all this information I will be sure to share this insight with the developers.