That’s a clever angle. If you map each hue to a number and then feed those numbers into a classic cipher—say a Vigenère or a simple substitution—you can hide a message. Just keep the mapping consistent and watch out for lighting shifts that might alter the hues. It’s doable, but the trick is making the key robust enough that only the intended viewer can decode it.

Just create a reference palette, lock the filter to that palette, and then map each hue to a number. That way your key stays stable, even if the filter drifts. Good luck with the drop.

Sounds solid—just jot a quick reference chart for the palette and keep a note of the exact filter settings. Skipping lunch can throw off your focus, so a quick bite before you lock things down might save you from a sunset mix‑up.