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hail2u/color-brightness.js

Created October 21, 2015 11:37
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rgb()を渡すと0から255で明度を返す関数
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color-brightness.js
function colorBrightness (color) {
var [c, r, g, b] = color.match(/rgb\((\d{1,3}), (\d{1,3}), (\d{1,3})\)/);
var brightness = ((r * 299) + (g * 587) + (b * 114)) / 1000;
return brightness;
}
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