Runs in your browser. Nothing is uploaded.
A photograph has light and dark patches, and a dark module sitting on a dark patch is invisible to a scanner. The picture is washed toward your background colour to flatten that — the badge above is the real contrast measured off the finished code, not a guess. Keep it at 3.0:1 or better.
Scan it off the screen before you print it
Noted — you will hear from us once, when it is live.