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function rgb2hex(rgb) {
 var components = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
 function hex(x) {
 return ("0" + parseInt(x).toString(16)).slice(-2);
 }
 return "#" + hex(components[1]) + hex(components[2]) + hex(components[3]);
}