In the interactive mode a few icons are added to the interface:
(1) The “swap” button: If selected, pixels will be deactivated or activated when the finger slides over them, depending on their current state. A single color channel can be activated/deactivated from within the regarding channel view.
(2) The “sponge”: Reset pixels to their activated state (activated pixels are not deactivated when slid over).
(3) Store a snapshot of currently activated/deactivated pixels.
(5) Stored snapshots: The icon will only be visible if stored snapshots exist. Tapping on it will display the list of stored snapshots and and a reset link on the bottom of the list which deletes all stored snapshots.
Snapshots will always be saved when the app quits.