It's a demonstration about how simplest steganography technique works and what you can do to detect this stuff.
Basically, the payload.txt's content is loaded onto the carrier: Lenna_orig.png. The system gives a payload-filled.png as well as results retrieved from different bits of the RGB channels.
Start a terminal at current project directory, first run source env/bin/activate. Then python LSB_map.py
Compare one output with another, and take a closer look at "result_red_1.png". The unique texture shows something different.