codeigniter png类型图像上传水印，给出错误的图像

Question

我已上传此图片：uploaded image

结果图片是：Watermark image

我的代码功能正常工作png类型图像和其他。只发生此图像..我找不到任何答案 相关的。请帮助任何人。这是我用来图像上传的代码。请检查一下并给出与此相关的任何答案

$this->watermark->watermarkCopy();
$this->watermark->resize($width, $height);
$this->watermark->add($temp_auction_listing['temp_auction_listing']['link_1'], $width, $height);

这是水印功能

 public function watermarkCopy() {
            $source = 'images/watermark/wartermark-png.png';
            $watermarkcopy['image_library'] = 'gd2';
            $watermarkcopy['source_image'] = $source;
            $watermarkcopy['create_thumb'] = FALSE;
            $watermarkcopy['maintain_ratio'] = TRUE;
            $watermarkcopy['quality'] = '100%';
            $watermarkcopy['new_image'] = 'images/watermark/watermarkCopy.png';
            $watermarkcopy['overwrite'] = FALSE;

            $this->load->library('image_lib');
            $this->image_lib->initialize($watermarkcopy);
            if (!$this->image_lib->resize()) {
                echo $this->image_lib->display_errors();
            }
    }

  public function resize($width, $height) {
        $settings['maintain_ratio'] = TRUE;
        $settings['image_library'] = 'gd2';
        $settings['quality'] = '100%';
        $settings['width'] = $width / 2;
        $settings['height'] = $height / 2;
        $settings['source_image'] = 'images/watermark/watermarkCopy.png';
        $this->image_lib->initialize($settings);
        $this->image_lib->resize();
    }

 public function add($url, $width, $height) {
        ini_set('memory_limit', '128M');
        $config['source_image'] = $url;
        $config['wm_type'] = 'overlay';

        $config['wm_overlay_path'] = 'images/watermark/watermarkCopy.png';
        $config['new_image'] = $url;
        $config['wm_hor_alignment'] = 'center';
        $config['wm_vrt_alignment'] = 'middle';
        $config['padding'] = '50%';
        $config['wm_opacity'] = '50';
        $config['wm_x_transp'] = '3';
        $config['wm_y_transp'] = '3';
        $config['quality'] = '100%';

        $this->image_lib->initialize($config);

        if (!$this->image_lib->watermark()) {
            echo $this->image_lib->display_errors();
        }
    }