Light and dark

[avp]

Find out if a color would be classified as light and/or dark.

For example, when using light colors, dark text looks good. So we need a function light() that returns true if the color is light and false otherwise.

From http://24ways.org/2010/calculating-color-contrast/:

function getContrastYIQ(){
    var yiq = ((r*299)+(g*587)+(b*114))/1000;
    return (yiq >= 128) ? 'dark' : 'light';
}