to do

• option to hide selected/images or folders in android media database.
  • either make them completely invisible for all gallery-apps/image-pickers (including "A Photo Manager") via ".nomedia" file (already implemented)
  • or marking image as private so other gallery-apps/image-pickers will not see the image and "A Photo Manager" needs password to make them searchable/visible

To prevent pictures from accedental viewing (i.e. if you give your device to somebody else) you can also password-protact the Filter-View.

Example: In presentations I always add the filter "only images with no people" (images that do not contain the tag "people") for privacy reasons. If i give the android device to somebody else it is not possible to find/view images of my family without knowing the password.