Php 如何使用 codeigniter image_lib 压缩图像

我试图压缩codeigniter php网站中图像的大小，并在控制器中编写了以下代码:

$this->load->library('image_lib');
$this->load->library('upload');
$image = array();
$ImageCount = count($_FILES['pimage']['name']);
for($i = 0; $i < $ImageCount; $i++){
    $_FILES['file']['name']       = $_FILES['pimage']['name'][$i];
    $_FILES['file']['type']       = $_FILES['pimage']['type'][$i];
    $_FILES['file']['tmp_name']   = $_FILES['pimage']['tmp_name'][$i];
    $_FILES['file']['error']      = $_FILES['pimage']['error'][$i];
    $_FILES['file']['size']       = $_FILES['pimage']['size'][$i];
    
    // File upload configuration
    $uploadPath = './uploads/products/';
    $config['image_library'] = 'gd2';
    
    $config['upload_path'] = $uploadPath;
    $config['allowed_types'] = 'jpg|jpeg|png|gif';
    $config['quality'] = '60%';
    
    // Load and initialize upload library
    $this->load->library('upload', $config);
    $this->upload->initialize($config);
    
    // Upload file to server
    if($this->upload->do_upload('file')){
        // Uploaded file data
        $imageData = $this->upload->data();
        // $uploadImgData[$i]['image_name'] = $imageData['file_name'];
        $uploadImgData[] = $imageData['file_name'];
    }
}

但上传后的图像仍然保存在相同的大小，谁能告诉我这里出了什么问题？