What Picture Manager can do for you:
Rename your pictures with different timestamp formats and other EXIF metadata like camera model, manufacturer and many more.
This is useful since some manufactures like HTC and Sony (probably some more) save pictures taken with an incremented number in the filename, instead with a timestamp like other manufactures do.
When you factory reset your device, buy a new device or clean flash a custom rom, the camera picture counter gets reset and starts with e.g. IMAG_00001 again.
This can be an issue once you backup your files to a harddrive on your PC, because you will have duplicate filenames, although the pictures are actually different
Bring more organization into your picture collection by sorting your pictures into dated folders or even named by the location you've taken your pictures.
E.g. If you been on vacation and made a roundtrip, you don't need to remember the city anymore you've taken the pictures. Picture Manager will do that job for you by sorting the pictures
into folders named by the location the pictures were taken.
The organizer also offers a feature to move your images to your external sdcard or even USB Storage.
In the premium version that can be done even automatically.
A useful use case is also to move Videos to another location to prevent Google or Amazon Photos to sync them to the cloud.
Clean up your images collection
Picture Manager offers a duplicate image finder to get rid of duplicate images and restore some space on your phone memory
Also there is an option to find similar images based on PHash and AverageHash.
Edit exif metadata directly in Picture Manager, either single images or in batch mode.
Use conditions to only edit EXIF attributes matching them.
You have to be on at least Android 5.0 Lollipop
How does it work
Picture Manager relies on the EXIF Metadata that is stored into each picture. The EXIF Metadata contains a lot of information, the one Picture Manager needs is the date the picture was taken.
With that information Picture Manager can reliably rename and organize your pictures.
Picture Manager comes with a Tasker Action Plugin. That means that you can start a batch process on different events, like time, when usb gets connected etc.
If you want to use the custom format, background service or the Tasker plugin you need to upgrade to the premium version.
To upgrade you can use an in app purchase. Or you paypal me and I mail you a premium code. That way google doesn't get 30% of the income.