Node.JS Bitmap Steganography

http://abovesobelow.com:3000 <-- Link if it's still active.

I don't really know what to say, go look at the link, there's a video explaining it.

I was messing up the algo for a while, finally got it down today.  The image on the right is the stego image, the image on the left is the original.  The difference is barely perceptible.

Some stego programs use only the least significant BIT, so the change is even less perceptible, however you're only able to fit 1/4 as much data into a bitmap file, always trade-offs.