Hi Gubosca ,
Most likely, this is caused by a defective monitor profile.
Set your monitor profile to sRGB, and see if that fixes the problem. How do I change my monitor profile to check whether it’s corrupted? - The Lightroom Queen
Can you show us a screen capture of the Library view and another screen capture of the Develop Module view. Both need to be zoomed to 1:1. Thanks.
If the only difference is noise, and maybe contrast, it's probably not the monitor profile.
I think dj_paige is on the right track.
Sharpening and noise reduction need to be applied and evaluated at 1:1 view, any other view will be inaccurate and misleading because of image scaling. So please post screen captures at 1:1, a screen capture of the Detail panel in Develop will also be useful.
These aren't zoomed 1:1, are they?
The two images are practically identical at 1:1.
The difference in Fit view is caused by your sharpening/noise reduction settings, but Fit view is never reliable.
So always use 1:1 view to apply and evaluate sharpening and noise reduction.
Also, see this thread: Re: Losing my work from Develop to Library
This looks like the Library Fit view preview is not being updated. If it was due to over-sharpening or insufficient NR the Library Fit view preview would have less detail than the the Develop preview. You can see many more small size stars in the Library Fit view than in the Develop module view and the brighter stars are slightly less bright. This indicates to me that both the Sharpening and Noise Reduction settings are not being applied to the Library preview and apparently the Export file as well. Is that correct, the Export file looks the same as the Library module?
I suggest Exporting this image file to DNG file format and post to Dropbox or other file sharing site. The DNG file will contain your LR Develop settings so that we can see how it behaves on our systems (with your settings). Thank you.
I also have the same question. I recently updated to Lightroom 2015.6 and was just going through some images of a painting and after making minimal corrections to a Canon CR2 images in order to begin weeding out images I noticed that jumping back from the Develop Module to the Library Module resulted in different views. Interestingly enough, in the fraction of a second of jumping back to the Library Module the image did retain the sharpeness from the Develop Module but then quickly became slightly blurry.
I'm also curious why this difference in appearance is happening and making using Lightroom a little less joyful. I've relaunched Lightroom and rebooted my computer but this behavior is still happening. Please check out the 1:1 images for reference.
Adobe rep ... what's going on here? Is this a known bug at the moment? Or am I possibly overlooking a preference setting that I can't seem to find to control this change?
Thanks for any assistance,
APPEARANCE FROM LIBRARY MODULE
APPEARANCE FROM DEVELOP MODULE
I’d guess that something is wrong with your preview cache and LR cannot retrieve the full-size preview.
What happens if you discard then recompute 1:1 previews?
Thank you for the suggestion of clearing the preview cache, however, I didn't need to, as I exported an image (closed Lightroom) and started retouching in Photoshop. Upon opening Lightroom again (the third time) the previews in both the Library and Develop module matched. Not sure what caused the blurry previews when I was trouble-shooting but as we all encounter more frequently than we'd like to admit, sometimes computers have a mind of their own.
In hopes of preventing this for other images, I did end up clearing the preview cache out.
Thanks again for the suggestion,