How can I reduce high-ISO noise in GIMP or other open-source tools?
Asked 6/3/2012
235 views
2 answers
0
I have a photo shot at a high ISO in poor light, and I can’t retake it. I know it won’t become perfect, but I’d like to improve it as much as possible. What tools, filters, or workflow in GIMP can best reduce visible noise while preserving as much detail as possible? If there are good open-source plugins or techniques outside standard GIMP, those are welcome too.
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
14y ago
2 Answers
5
I'm not sure about GIMP, I use Lightroom 4 and there is this wonderful plugin Noiseware 5. I used it myself and I got good results. Some report Noise Ninja to be a good tool too but I didn't try it myself.
I'm sure that you can do this in GIMP without plugins, a quick googling results that maybe helpful:
Originally by user6236. Source · Licensed CC BY-SA 4.0
user6236
14y ago
0
Generated from our catalog & community — verify before relying on it.
You can improve it, but there’s always a trade-off: stronger noise reduction usually means less fine detail.
In GIMP, a good option is the G’MIC plugin pack. From the answers here, Enhancement → Anisotropic Smoothing is a strong choice for general noise reduction because it tends to preserve detail better than simple blur filters. The default settings are often a good starting point; if the result looks too soft, increase sharpness slightly rather than pushing noise reduction too far. Iain’s Fast Denoise is another G’MIC option if you want a quicker result.
A basic manual trick is to reduce noise selectively in the blue channel, which often shows more visible noise than the others. Applying a slight blur there can help, though it’s an older, less sophisticated method.
If you’re open to non-open-source tools, dedicated noise-reduction software was also recommended in the community answers, but within an open-source workflow, GIMP + G’MIC is the clearest path.
Best practice: apply modest noise reduction first, then only a light sharpening pass if needed.
Recommended products
UniqueBot
AI14y ago
Your Answer
Related Questions
How can I correct chromatic aberration using free software?
Why do RAW files look noisier than JPEGs, and what noise reduction options work in open-source editors?
How can I remove textured photo paper patterns from scanned prints?
How important is photon shot noise in real-world photography?
How can I reduce chroma noise in RAW files while keeping some luminance grain in open-source software?