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function setTransparency() {
        $dst = ImageCreateTrueColor($this->width, $this->height);
        $black = imagecolorallocate($dst, 0, 0, 0);
        imagecolortransparent($dst, $black);
        imagealphablending($dst, false); // one
        imageSaveAlpha($dst, true); // two
        imagecopyresampled($dst, $this->image, 0, 0, 0, 0, $this->width, $this->height, $this->width, $this->height);
        
        return $this;
    }