[davidsong]

Hmm, okay, so we reduce to black and white, add some warp and noise and then reduce the size so that the text is only just readable.

...and they focus on adding fonts of multiple sizes so it can't be shrunk without losing information.

[thaumasiotes]

Reduce to black and white, and proofread for dots. If they're still there, they will be easy to see, since you only have two colors. You can white out an image that came out looking like a test pattern.