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我正在使用 codeigniter 图像类将图像调整大小并将其裁剪为特定大小。如果源图像的纵横比不同，无法将其设置为我想要的大小，我会填充图像添加空间，直到它适合为止。问题是我需要将此颜色设置为白色。测试图像是黑色的，我怀疑它选择的颜色是任意的。我认为核心图像库需要修改，但会喜欢一种非黑客方式。请帮忙。这是我的代码供参考。显然我正在向它传递参数，它应该很明显。

copy($row['photo'],$new_filename);  
$this->CI->load->library('image_lib'); 
if ($row['width']>$device_params['width'] || $row['height']>$device_params['height']) {
    $config['image_library'] = 'gd2';
    $config['source_image'] = $new_filename;
    $config['maintain_ratio'] = TRUE;
    $config['quality'] = '40%'; 
    if ($scale) {
        $device_params['height'] = ($scale / 100) * $device_params['height'];
        $device_params['width'] = ($scale / 100) * $device_params['width'];
    }
    $config['height'] = $device_params['height'];
    $config['width'] = $device_params['width'];
    $config['master_dim'] = 'height';
    if ($row['width']<$row['height']) {
        $config['rotation_angle'] = '270';
        $config['master_dim'] = 'height';
        if (strtolower(substr($new_filename,-3))=='jpg') {
            $this->CI->image_lib->rotate();
        }
    } else {

    }

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

    $this->CI->image_lib->resize(); 
    $this->CI->image_lib->clear();
    unset($config);
}       
if ($device_params['crop']) {

    $config['image_library'] = 'gd2';
    //$config['library_path'] = '/usr/bin/';
    $config['source_image'] = $new_filename;
    $size = getimagesize($new_filename);
    //var_dump($size);
    $x_axis = $size[0]/2-($device_params['width']/2);
    $y_axis = $size[1]/2-($device_params['height']/2);
    //echo $x_axis.'-'.$y_axis;
    //die();
    $config['maintain_ratio'] = FALSE;
    $config['height'] = $device_params['height'];
    $config['width'] = $device_params['width'];
    $config['y_axis'] = $y_axis;
    $config['x_axis'] = $x_axis;
    $config['master_dim'] = 'auto';
    $this->CI->image_lib->initialize($config); 
    if ( ! $this->CI->image_lib->crop())
    {
        $data['output']['status'] = 0;
        $data['output']['message'] = $this->CI->image_lib->display_errors();
    }

}
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