AFAIK LR‘s use of xmp sidecar files is optional. It always stores all the
image-specific data in its database but you can choose to also create
sidecar files to improve compatibility with other DAM tools.
However as you say, ‘collections’ are only in the database. If you need to
switch to a different DAM you could apply the collection name as a keyword
to all the included images and rebuild the collections in the new DAM
(assuming it has something to support such a thing).
Jez
On Tue, 7 Jan 2020 at 19:15, Moose <olymoose@xxxxxxxxx> wrote:
> Reading through this thread, there seem to me to be a lot of possible
> confusions and/or misunderstandings.
>
> 1. There are two models:
> a. Leave all the files where they are and create a catalog of them,
> including thumbnails. Browsing is fairly quick;
> viewing full size or editing loads the original from disk. Catalogs are
> relatively modest in size.
>
> b. Suck up the original files and move them into a catalog/database.
> (Madness!!)
>
> LR allows either model. My impression is that most other converter/editors
> use model 1.a.
>
> Model 1.a. has an inherent problem with keeping catalog and image files in
> sync. In LR, it's relatively easy. When any
> photo had had metadata changes, there is a little arrow on the thumbnail.
> One may choose to import the metadata changes,
> or overwrite them from LR.
>
> If a file name is changed, one must delete the catalog entry and re-import
> under the new name. Not a personal problem,
> as I don't change the file names that the camera assigned, nor do I move
> original files.
>
> 2. I'm not sure, but it seems as though there is some confusion about
> switching to a new/different DAM. LR stores its
> image specific data, such as geocode, keywords, star ratings and
> ACR/Develop Module settings, in XMP "sidecar" files in
> the same directory as the image file.
>
> I can see all these things in an external EXIF viewer, so they are not
> hidden away somewhere in LR.
>
> As far as I can tell, LR does not store Collection data in the XMP files.
>
> It would appear that I could try out a different DAM by simply using it to
> index/catalog my existing photos. Perhaps all
> I would need to recreate would be its version of Sets/Collections?
>
> Confuse A Moose
>
> --
> What if the Hokey Pokey *IS* what it's all about?
> --
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