What if instead of entering a password or code, for a captcha, pin number or other authentication, you were asked to select four colors, each one out of 256 potential colors? In short, you password or secret code would be a set of colors.
The advantages are as follows:
What do you think?
I like coloured alphanumeric characters.
It's quite a good idea, but I can see a few other issues with it.
Second, people are not always good at matching subtle distinctions in color, which 256 color palette would bring.
Third, gamma values vary between computers, so color matching is not always reliable.
I don't necessarily think this is overall a bad idea, but it would be worth testing with those caveats.