Stores arbitrary files in a png! This tools takes binary data and saves a byte at a time into the R, G, and B channels of each pixel. Data can be extracted manually by reading the pixels left to right, top to bottom, and saving each byte back out to disk.
Almost none! This tool was built as an exercise in image manipulation. I suppose you could use it to store data on image hosting sites, but there are already better ways of hiding data in a PNG that aren't nearly as obvious and don't require a square image.
require_relative 'ImgStore'
ImgStore.encode("hello world!", "foo.png")
ImgStore.decode(File.read("foo.png"), "decoded.txt")Here's an example "hello world" audio file.
And here's that same wave file embedded in a PNG:
Provided is a test script (examples/test.rb) that will generate the PNG, then decode the PNG and recover a working wave file.