Check the Exif data of your images to prepare your Raspberry Pi photo frame for smart playlists
If you want to apply smart filters to only show specific images, you will need accurate Exif data. Run a health check on your collection.
Image Viewer
How I added smooth crossfading image transitions to my Raspberry Pi digital picture frame (OS Buster Edition)
Pi3D PictureFrame is hands down the best image viewer software you can find for your photo frame. Look here for a full tutorial to set it up in no time.