Obviously duplicates were not detected before when Photos was probably looking at IMG_2829.JPG and IMG_2829.HEIC as different files even though it's really the same picture?
The duplicate detection in Photos, when importing image files is checking for identical files, so the file format has to be the same. Photos does not check for identical images. Photo Sweeper can scan your library for similar photos and detect multiple versions of the same photos.
HEIC or JPG? I see the file format is smaller with HEIC but is it better quality in the end?
HEIC files have the same image quality as the original image, but have a better compression.
But if we import images as HEIC and videos as HEVC, Photos will create an additional JPEG for the HEIC files to share with Media Browser, and an addition H.264 video for any HEVC video. Right now we will need more storage on our Mac, if we use the space saving HEIC and HEVC formats in Photos on a Mac. I hope, this will soon be fixed.
The converted items for the Media Browser can be found in the user library ~/Library/Containers/com.apple.MediaLibraryService/Data/Library/C aches
There are two subfolders:
- com.apple.iLifeMediaBrowser.ILPhotosTranscodeCache : Here are plenty of videos and images, converted from HEVC and HEIC to a more compatible format and eating several GB of my disk storage.
- com.apple.iLifeMediaBrowser: Here are thumbnails for the media browser