该问题提供的信息不足，无法提供完整的答案.

The question gives insufficient information to provide a complete answer.

错误的自适应过滤器类型"消息表示PNG文件已损坏或由错误的编码器生成.

The "bad adaptive filter type" message means that the PNG file is either corrupted or was generated by a buggy encoder.

PNG文件的每个扫描行均以过滤器类型"字节开头，该字节必须为0、1、2、3或4.

Each scanline of a PNG file begins with a "filter type" byte which must be 0, 1, 2, 3, or 4.