Automatically change text color to assure readability

Question

Users can set the background-color of a button through a textbox that accept RGB hexadecimal notation: ff00ff, ccaa22, etc. So I need to set the te

Answer 1

A bit late to the party, but IMO all text should either be light or dark. Colored text is for links.

Here's a coffeescript function I've written to decide which to use:

is_light = (hex_color) ->
  c = hex_color.replace(/^#/,'')
  sum = parseInt(c[0]+c[1], 16)
  sum += parseInt(c[2]+c[3], 16)
  sum += parseInt(c[4]+c[5], 16)  
  log "sum is #{sum}"
  sum > 382.6