Please remember that the image you see on your cameras LCD or in its Electronic Viewfinder (if mirrorless) is a JPEG. Even if you are shooting in RAW only. Incidentally, if shooting in RAW only, that JPEG you see, is a very small one that is embedded into the RAW data file. (newer cameras are starting to enlarge that small file, so I will not say itty bitty small JPEG). Now, when you import into Lightroom, the first images you see in the filmstrip are of those embedded JPEG's (if importing RAW). At some point, usually within seconds, they turn into little ugly images, as Lightroom creates the previews of the RAW data. Remember you never ever actually see the RAW image, you see a preview, an interpretation. And when you first bring up that image in a loup view, it can look flat, muddy, not vibrant. Bring it up in the Develop module, same thing, perhaps worse (Library and Develop display differently) Oh, also, the JPEG vs RAW exposure may not match perfectly, for one thing you may be doing lots of setting changes, color, sharpness, etc, and the film simulation )or what ever your camera calls it) will be doing some majic as well. No suprises RAW and JPEG are different in all respects. SO, HOW TO FIX. Well you need to post process that image. Now, do not panic, easy quick fix, apply a profile, one instead of Adobe Standard, you can even do that during import.
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