Export modified (not original) photos from Photos.app to a folder, to work around a screensaver bug.

export_modified_photos_for_screensaver.scpt

-- Works around a bug where Photos screensavers show original rather than edited versions:
-- https://discussions.apple.com/thread/7881820
--
-- This script exports edited versions to a folder, which the screensaver can then be configured to use.
-- Run it on a schedule e.g. via crontab.
-- By Henrik Nyh <https://henrik.nyh.se> under the MIT licence.

set albumName to "Skärmsläckare"  -- Export from this album.
set exportFolder to POSIX file (do shell script "echo ~/Library/original_photos_for_screensaver")  -- To this folder.

-- We don't delete via Finder, to avoid filling up the trash.
do shell script "rm -rf " & quoted form of (POSIX path of exportFolder)

tell application "Photos"
	with timeout of 3600 seconds
		export (get media items of album albumName) to exportFolder
	end timeout
end tell