src/Intervention/Gif/Frame.php
public function hasTransparentColor()
    {
        if ($this->graphicsControlExtension) {
            $byte = substr($this->graphicsControlExtension, 1, 1);
            $byte = unpack('C', $byte)[1];
            $bit = $byte & bindec('00000001');

            return (bool) $bit;
        }

        return false;
    }
public function hasTransparentColor()
    {
        if ($this->graphicsControlExtension) {
            $byte = substr($this->graphicsControlExtension, 1, 1);
            $byte = unpack('C', $byte)[1];
            $bit = $byte & bindec('00000001');

            return (bool) $bit;
        }

        return false;
    }
Determines if instance has transparent colors

@return boolean