How Photos stores libraries?

I would like to understand how Photos stores photos. I come from a background of Picasa. Picasa, only used tags to build libraries but not to reproduce the photo itself (which I understand). However, it looks like iPhotos and Photos really build a coded library which, in a sense, duplicate photos in their own system of coded library.

Is this correct?

So, if this is correct, I guess that if I want to use one of the photos of, say, a document, I first need to export in the pictures folder (or somewhere) and it access?

And, if this is correct, it raises the question of whether copies of photo outside the library can be deleted safely? What a pity that 'information' about the photos of the library do not point to their original location in the pictures folder.

Post edited by: wizard_chef to add another question

It looks like iPhotos and Photos really build a coded library which, in a sense, duplicate photos in their own system of coded library.

Is this correct?

Photos, iPhoto, Aperture, etc., are essentially applications of databases keep track of your photos and everything that changes and tags have been added to them.

If you have iPhoto and photo libraries, they both link to the same files on your drive. the files are not duplicated, even if she looks like this in the Finder. If you remove, say, iPhoto library, you re - win very small storage space.

Because these applications are databases, you should let them consolidate (as opposed to the use of libraries referenced) all your images and never, ever try to reorganize or rename, the files directly in the library file.

Tags: Mac OS & System Software

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