Why do Lightroom photos sometimes look noisy after export, then look clean again later?
Asked 5/17/2020
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2 answers
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In Lightroom, my processed photos can look much grainier/noisier than the original RAW file. What’s odd is that the same exported image may look fine right after export, but days later it appears grainy in the same software, and sometimes switches back again. The original files don’t show this behavior.
Applying noise reduction in Lightroom helps a little, but the exported/previewed result can still look much noisier than expected. However, when I upload the same image to Flickr, it looks cleaner.
Could this be caused by Lightroom previews rather than the file itself? Why would the appearance change over time, and how can I verify whether the exported JPEG is actually noisy or if it’s just the viewer/preview rendering?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
6y ago
2 Answers
3
There is no way I can imagine that the same jpg can one day be 'clean' & another day be 'grainy', then the next back to 'clean', unless it is being viewed by an app that is failing to correctly load it, or is re-interpreting at load.
The file itself is either good or it is broken. Broken files don't demonstrate 'grain' they either show large blocks of unmistakable error, or they will not open at all.
Test the files in another app or on another computer.
Originally by user57929. Source · Licensed CC BY-SA 4.0
user57929
6y ago
0
Generated from our catalog & community — verify before relying on it.
This is most likely a preview/viewer issue, not Lightroom randomly changing the actual JPEG.
A JPEG file will not alternate between “clean” and “grainy” on different days unless the app viewing it is rendering or loading it differently. In Lightroom, noise reduction is processor-intensive, so low-resolution previews may not reflect full noise reduction. A full-resolution preview can be generated, then later discarded or invalidated after edits or preview-cache cleanup. That can make the same photo appear cleaner at one time and grainier at another.
Exports are rendered at full resolution, but Lightroom doesn’t necessarily keep that full-res render as an ongoing preview. That explains why it may look good right after export, then different later.
What to do:
- Check the exported file in another image viewer or on another computer.
- Compare the actual exported JPEG, not just Lightroom’s preview.
- Rebuild 1:1/full-resolution previews if needed.
- Remember that websites like Flickr may display resized versions, which can make noise less visible.
So yes: the changing appearance is very likely due to preview generation/caching, not the image file itself gaining grain over time.
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