In a recent weekend long game, we started using colour coded lanyards to determine players photography preferences:
- Black: No photography restrictions (take and publish without tagging)
- Orange: No photography without explicit per photograph consent
- Purple: No photography at all (absolutely must not publish)
This worked well during daylight hours, it meant that people could avoid taking a photograph if a Purple lanyard was in shot, and ask before publishing if an Orange lanyard was noticed in shot later.
The problem came in the evening. With photos taken under artificial light, it was much more difficult to tell Black from Purple lanyards, especially across the other end of a large room. As such, people are concerned that if photos slipped through at the 'taking the photo' stage then they might not be noticed at the 'publishing' stage either.
A variety of alternate colours have been suggested, but people have brought up the subject of making the colours contrasting for people with the various forms of colour blindness too.
Is there a combination of colours which have proven to be effective at providing good contrast in a variety of lighting conditions, and which are suitable for the more common forms of colour blindness?