PNGDrive is a free file system for Linux licensed under the GPL 3. It is as a steganographic file system that allows users to access file systems hidden within PNG images.
By default the data is both encrypted and stored on the least significant bits of each pixel meaning that the image remains very similar to the original and the existence of a file system becomes untraceable unless both bit mask and password are available.
Using this tool you can access any PNG image as if it were a file-system, meaning you can copy files into it, edit files from it, remove, etc… and once you’ve finished its just a picture.
To create the PNG (RGBA) from JPG:
Note: Requires package ImageMagick