For some purpose, you might want to hide certain folder to be scanned and display from your Gallery Apps as the number of pictures might slow down your images to be displayed or you do not want to display those icon from your Gallery Apps.
To done this, you may easily hide them by the step as below.
1. Use any file manager apps such as Astro file viewer.
2. Rename your folder with a dot in front of the folder such as image as above.
3. Now, open back your Gallery Apps and you will found out all the unwanted image is disabled.