Digital noise on Fujifilm X-Trans II sensor

[Eloren1]

Yeah, the problem is definitely there. I tried different denoising algorithms and it didn't help. Digital and color noise even at base ISO 200.

↑ FSC / ↓ NLP

SAMPLE FILE: https://github.com/Eloren1/Film-Scan-Converter/raw/refs/heads/drive/XE2S7119.RAF

[kaimonmok]

I don't have NLP, so would you be able to try something for me?
Could you export the image using the "Crop Only" mode, and export as a 16-bit tiff, then use NLP to invert the TIFF? I'm trying to isolate where along the pipeline the noise is being introduced. Thanks.

[kaimonmok]

I have a suspicion that this has to do with the raw converter Rawpy/LibRAW, as it appears that noise is introduced right at the demosaicing step. If anybody else wants to dig through the Rawpy or LibRAW docs for possible parameters that might affect the noise, you can try, but I feel like I've tried just about every parameter to no avail.

My only guess is that other image processors are using more sophisticated RAW converters that don't introduce the same level of noise. But this is at the edge of my own understanding of image processing and demosaicing, so if anybody else has ideas, then I'd love to hear them.

[Eloren1]

Could you export the image using the "Crop Only" mode, and export as a 16-bit tiff, then use NLP to invert the TIFF? I'm trying to isolate where along the pipeline the noise is being introduced.

Forgot to mention, I already tried that. The noise still was there.

[Eloren1]

Do you use bad_pixels_path btw? I have some hot pixels in my camera

UPD: nvm it requires a custom file with coordinates for each hot pixel

[kaimonmok]

Do you use bad_pixels_path btw? I have some hot pixels in my camera

I don't. You can try it, but at most, that would only correct individual pixels and not noise patterns on the whole.

[WhyFenceCode]

what sort of light are you using to back light? i had similar noise and i switched the light and its better now, albeit this only works if the noise is present in the picture taken, not if it is introduced in software.