[challenge] Hiding data in images (steganography)

It would be interesting if you made some sort of steganography algorithm. A simple idea would be to hide a black & white image in another image. I think that Processing would be the best choice for this, and anyway you *wanted* to make more CC's in Processing.

[Wikipedia page on steganography](https://en.wikipedia.org/wiki/Steganography)

Start with the linked Wikipedia page and determine the intended steganography approach in Processing. The issue names no files or tests and does not define acceptance criteria; scope would need to be clarified before implementation, including what demonstration counts as hiding and recovering a black-and-white image.

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