CodeIgniter调整上传的图像不起作用

Question

我想创建上传的图像的缩略图，然后调整上传的图像的大小。 这是我的代码：

$data = array('upload_data' => $this->upload->data()); 
      $upload_data = $data['upload_data']; 


      //Create image thumbnail 
      $config['image_library'] = 'gd2'; 
      $config['source_image'] = $upload_data['full_path']; 
      $config['create_thumb'] = TRUE; 
      $config['overwrite'] = TRUE; 
      $config['maintain_ratio'] = TRUE; 
      $config['width'] = 150; 
      $config['height'] = 150; 

      $this->load->library('image_lib', $config); 

      $this->image_lib->resize(); 

      //Resize original image for space saving purposes 
      if ($upload_data['image_width'] > 850 || $upload_data['image_height'] > 850) { 

       $config['image_library'] = 'gd2'; 
       $config['source_image'] = $upload_data['full_path']; 
       $config['maintain_ratio'] = TRUE; 
       $config['create_thumb'] = FALSE; 
       $config['overwrite'] = TRUE; 
       $config['width'] = 850; 
       $config['height'] = 850; 

       $this->load->library('image_lib', $config); 
       $this->image_lib->resize(); 
      } 

缩略图创建就好了，但originial图像的大小调整是行不通的。我在这里错过了什么？

编辑：我曾尝试添加的行：

$this->image_lib->clear(); 

两个图像之间的操作。

Answer 1

原来我需要重新初始化$配置为好，像这样：

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