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A tattoo on your face? I wonder if there are any inks you could safely use that would be invisible to people but visible to cameras.
by sdrothrock 11y ago
A tattoo on your face? I wonder if there are any inks you could safely use that would be invisible to people but visible to cameras.
- jrockway 11y agoUnfortunately, imaging systems co-evolved with humans, thus they tend to hack things so that they are sensitive to light in the exact way the human eye is. (Your monitor isn't emitting orange light, it's fooling your eyes by making it think the light is orange by activating red/green/blue-sensitive chemicals in your eyes the same way orange things do.) Digital cameras can be pretty sensitive to IR, but there is typically an IR filter over the sensor to prevent detection. Your best bet is to wear one of these: https://en.wikipedia.org/wiki/Balaclava_(clothing)#/media/File:Balaclava_3_hole_black.jpg https://en.wikipedia.org/wiki/Balaclava_(clothing)#/media/Fi... Given that it's -10 C outside today... nobody will even think you're weird.
- tombrossman 11y agoOne cool trick I learned was how you can take a normal remote control and view the IR light flashing when looking at it through your mobile phone camera. It's useful for determining if the batteries are still good in the remote, for example.