If you can't copy the LRCAT file then you have a system level permissions issue. Once that file is moved, and when you opened the catalog file with Lightroom you will also need to relink to your image library on the external hard drive . . .
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Some of the translation leaves a bit to be desired but are you certain you are not attempting to a apply one adjustment brush over another? What is a "centrifugal filter function normally"?
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Can you give the forum some system details thanks. Exact Lightroom version, Operating System and version Local external storage types if any . . .
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Is there any Cloud-solution storage in your system? Or is all your storage and backup local to your PC but perhaps on external drives or NAS boxes?
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It looks like you have done this outside Lightroom, but that is not clear from your initial post. Have you been able to relink the files following the above link?
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Do you perform the folder merge described above inside or outside Lightroom? There have also been some reported issues with NAS drives not having correct read/Write privileges set for Lightroom to use . . .
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Some Lightroom users employ the system for that, similar to what Jao has said above. I use the Presets tab of the Preferences menu and open the system storage folders that way.
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For my master catalog I am using Transmit software on a couple of IMacs to a RAID formatted NAS box. Works great. Also to Dropbox for much smaller specialised catalog . . .
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I'd be using an Import preset to perform exactly that renaming task. Would that work for you? Leaving numbering gaps is not an option in Lightroom though . . .
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"I believe the true colour of the exported image is the saturated version and the programs are for some reason desaturating." Can you indicate why you might think this?
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This looks like multiple instances of importing where you may have changed the import properties. The Import choices are Copy as DNG, Copy, Move and Add. Awareness of the use of each of these may help resolve your issue.
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