The way it works is very simple: you select the photos that you want to hide, add them to a new folder, and establish a pattern to unlock the folder. From there, you can only see the photos if you can unblock the folder.
The application is compatible with almost any image format, like GIF, PNG, and JPG. You can also include videos that you've recorded on your device, and protect them behind the lock screen or a secret question.
Gallery Plus - Hide Pictures is an intriguing security tool that is ideal for hiding your private photos away from prying eyes.
Requires Android 2.2 or higher.