Lightroom and Noise

matt666

matt666

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Matt
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Noob question on Lightroom 5 - I've shot an image in Raw and done quite a bit of sharpening and noise reduction in the develop module. When I flick over to Library to export the image it adds back in some of the noise. The picture looks better quality in Develop than it does in Library.

Anyone know why this is?
 
Doesn't the library mode only show the original Raw file without the Develop applied?

I only ever export from the Develop module
 
Library mode is showing you a jpg preview.

You can set the quality of the preview in the settings somewhere, but that will take up more space and is not really required.
 
Last edited:
haggis said:
Doesn't the library mode only show the original Raw file without the Develop applied?

I only ever export from the Develop module
Click to expand...

No, that's not right. At least, it isn't with LR3.6 which I use, and I would be amazed if LR5 was any less capable.

All edits made in the Develop module are visible in the Library module. You can easily prove this by making a drastic change - eg a big crop, or convert to monochrome - and see that change in Library.
 
ecoleman said:
Library mode is showing you a jpg preview.

You can set the quality of the preview in the settings somewhere, but that will take up more space and is not really required.
Click to expand...

I don't think that's quite right.

LR isn't showing you a JPG as such, because that's a compressed file format. If you started with a RAW image and haven't exported it, then there is no JPG to show.

But in the Library module, LR does create and cache various previews (constructed from the RAW data plus the 'recipe' for the edits applied) to make loading quicker. They may or may not be compressed using JPEG-style algorithms, but that's not important. What is important is that they exist at various sizes (eg your chosen thumbnail size, plus probably 1:10, 1:5, 1:4, 1:2 etc) so that LR doesn't always have to construct a small image on-the-fly from the RAW data.

When you edit an image in Develop, LR ought to create a new set of previews. It looks to me like that hasn't happened in this case, and you're seeing a preview which was created and cached before the most recent edits.

I don't know how to configure / control the caching behaviour in LR, but hopefully someone who does will be along soon.
 
matt666 said:
Noob question on Lightroom 5 - I've shot an image in Raw and done quite a bit of sharpening and noise reduction in the develop module. When I flick over to Library to export the image it adds back in some of the noise. The picture looks better quality in Develop than it does in Library.

Anyone know why this is?
Click to expand...

There is a known bug in lr5 that affects output sharpening on resized images. Is that catching this.
 
boyfalldown said:
There is a known bug in lr5 that affects output sharpening on resized images. Is that catching this.
Click to expand...

If he's seeing the noise in LR, without exporting it, then that particular known bug would presumably not be the cause.
 
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