Remove long exposure sensor noise

i have to work with very low light(invisible to the eye) very long time exposures of bioluminescence events. the images are mostly black. even with 15 min. exposure. obviously the sensor gets hot pixels and mostly white noise. Topaz AI perfectly removes iso-noise but it removes only some of the bright pixels and leaves a lot behind. See attached screenshot. Is there a way to get rid of these “snow-flakes”? It should be possible to tell the program, that there is no white or no pixel with more than 90% brightness(of any color) in the whole picture to remove?

Thanks for reaching out. Please send the original image so I can try to reproduce this.

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We are working on hot pixel removal right now, but that is only for Raw files as we know it’s a significant issue in Raw.

Do you always process JPG files instead of the Raw? Raw is better for hot pixel removal so it’s best to remove hot pixels in the Raw before converting to non-Raw.

Hi Lingyu,

I did now send you 1file from Fuji x-t2 and 1 from x-t3. Both times the raf out of the cam and the jpg that the camera generated. You see 2 different sensors with their respective problems.

I do not always do that with jpg, but opening the raf takes much longer, and ACDSee2023 had problem with these raf(and I don’t know why yet,but that problem is not topaz related)

Thank you in advance for your help,

Best regards,


Thanks for sending the files. The Raw files should be handled better once we release the hot pixel fix.

That will come soon. I added your thread to the task so I can follow up once it’s fixed.

hi, any news about tis update?

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