I've SCOURED the web for 2 weeks now, and im probably an idiot, but I genuinely don't think the "solutions" posted adequately describe whats going on....and its driving me insane. I'm hoping you can help me. (I've only recently encountered this issue - the previous year i've used lightroom and never noticed this)
When i import my photos, and view them in the library tab, they still appear as I shot them (flat, log, etc).
When I open them in the Develop Tab, it looks as if my image "darkens" but I believe its just having its contrast "increased" even though the slider is at 100.
Dragging the slider to 0 gives me a similar image as the preview, but its still not the same. Which leads me to believe even more unauthorized changes are occuring behind the scenes.
From what I can see in your video, you use embedded previews, instead of setting LrC to render previews at import.
"Embedded previews are created by cameras and are not color managed, so embedded previews don't match how Lightroom Classic interprets the camera raw files. Previews rendered by Lightroom Classic take longer to generate but are color managed." (from this Adobe article)
I have never experienced it myself, so I'm not certain this is the cause of your issue, but certainly worth a try.
Hope that helps,
Michael Niessen - Photographer, photo-editor, educator
Yes, that is indeed the reason. Lightroom builds a preview with its own raw-engine, and that is different from your camera raw-engine. Apart from that, check your camera default settings. Preferences - Presets. If you choose 'Camera Settings' as default, the Adobe generated preview should be a closer match.