How to change jpeg quality when using an external editor in LR 4.1?

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  • Updated 6 years ago
How to change jpeg quality when using an external editor in LR 4.1?

I'm using LR4.1 on Windows 7 64-bit and I'm running into something quite annoying; When I open a jpeg image in an external editor (in my case Nik Software Editors) and I choose to " Edit a copy with Lightroom Adjustments" and JPEG file format I end up with a much smaller size, lower quality file before it's even saved by the external editor. I can't seem to find any settings for the jpeg quality and I'm starting wonder if I'm missing something big here... any help would be appreciated.

I have dug through the forums and google searches with no luck. I do prefer to work with RAW but some of the cameras I use only output JPEG and I don't want to make unecessary conversions to TIFF.

Looks like all the pixels are there but I find the file size to be shocking and the image appears to be slightly different. For example:

Original (as shot): 3648 x 2736 4,316 KB

(image was cropped in LR)

Create by "Edit in...": 3614 x 2711 668 KB

Created by Export at 100 Quality: 3614 x 2711 4,705 KB

At the very least I expected the file size to be the same. Even a completely untouched image appears to be different when created as the result of Edit In:

(Vertical composition)

Original (as shot): 3648 x 2736 4,170 KB

Edit in... (jpeg): 2736 x 3648 753 KB

After some experimentation with exporting files as jpeg and then comparing them to the file created as a result of "Edit in..." it seems that it would take a quality setting of 60 in LR Export to create a file of the same size that's created by Edit In. That's lower than what I thought was the LR default of 75 and definitely produces visible degradation.

So I'm still digging into this a bit and that (approx) .6 quality magic number seems to be in the "Lightroom 4 Preferences.agprefs" file under:

AgExport_jpeg_quality = 0.605,

AgPublish_jpeg_quality = 0.6,

But changing them to 1 does not seem to have an impact.
Photo of Paul


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Posted 6 years ago

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