What is the color profile of the exported jpg?
What is the application you are viewing it in. (the second screenshot) Does it understand profiles (color managed)
How does the file look in a web browser? If dull as above then I suspect you are not using sRGB as the profile in the export dialog.
Also can you please share which version of Lightroom are you using and on which OS are you seeing this issue.It will help us to track down the issue.
Windows version 10 family
Lightroom version 6.7
Camera raw 9.7
In the LR, if I switch between develop and library windows, I get the same problem. After developpement in develop window, if I look the photo in library window I get the same result as jpg file
Thanks for the information Denis, we will look into this.
In the LR, if I switch between develop and library windows, I get the same problem.
This means that you have a defective monitor profile. Most likely, a Windows update has installed a bad profile.
Try setting the monitor profile to sRGB. If this fixes the issue you should ideally calibrate your monitor with a hardware calibrator.
Press the Windows key+R, type colorcpl, and press Enter.
Add the sRGB profile, then set it as Default profile. See screenshot (from Windows 7) below.
Did you restart Lightroom after setting the profile to sRGB?
Yes! And I restarted my Pc too.
I tried to develop the photo in a new LR install on my Surface pro 4 tablet, and I got the same result. I Tried too with Photoshop 6 using same developpement paramters, on the same PC, and I got same problem too
This is very strange indeed - the different display between Develop and Library is usually fixed by setting the monitor profile to sRGB.
I notice that you have arrows on all the thumbnails in the filmstrip. They are pointing down, which means that the metadata in the catalog is newer than in the file. This means that the images have sidecar (xmp) files, which would not normally happen unless you have set Lightroom to Automatically write changes into XMP in the catalog settings (Ctrl+Alt+Comma).
I don' know if this has anything to do with your problem, but ...
What happens when you click on the arrow - what options are you given?
And have you used any other editor than Lightroom to edit these files?
View at 100% in both apps (and both Lr modules). Still different?
This type of image is very susceptible to scaling/resampling artifacts. At other zoom ratios than 100%, adjustment previews are based on the scaled version. This softens the sharp edges and this can affect the preview.
I press the arrow and now I have a XMP file, but the problem still again.
The first time as I developed this file is in 2014 with Photoshop 25, but I didin't eaxctly what I did, but only did a copy with "Alt" control and open a copy, aferet has ajusted Contratst a little bit.
In LR, in full view in both windows, Developpement and library, the photo seem be the same, no differences are visible, same in Photoshop.
I think you're right, this is probably artifact caused by the fact of not being at 100% scale