I tried both options, and both options visibly* degraded quality while failing to remove my hidden message. Consider that good schemes are already designed to be resilient in the face of lossy image compression, which is a lot more disruptive than the things you suggested.
* the 7-bit quantization + 1-bit noise option not by much, but still, visible
alt Hacker News
I tried both options, and both options visibly* degraded quality while failing to remove my hidden message. Consider that good schemes are already designed to be resilient in the face of lossy image compression, which is a lot more disruptive than the things you suggested.
* the 7-bit quantization + 1-bit noise option not by much, but still, visible