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Automatically pick text colour based on background colour

If you let users choose a colour for a background in your web apps, you may end up with unreadable text due to a lack of contrast, this little ruby method takes a hex value (like a css colour) in the form of 0x###### where the #’s are the hex colours letters or numbers, and works out if the text colour would look better in black or white.

For example:

# black_or_white(0x53BFD0)
# => #FFFFFF