22 Oct
2016
22 Oct
'16
1:03 p.m.
claims to be a red-green deficiency "trick question". You only see the numeral if you're colorblind. But after pasting the image into Mathematica, Rohan and I were unable to find a mapping, e.g., Image[(ImageData@%702) /. {r_, g_, b_, a_} :> {r', g',b',a'}] to reveal the hidden numeral. What's the trick? --rwg
