ExifTool是由Phil Harvey开发的Perl语言编写的命令行应用程序，主要用于读取、写入和编辑各种文件格式中的元数据标签。其核心功能依赖于一个庞大的标签定义数据库，该数据库映射了不同文件格式（如JPEG, TIFF, PNG, PDF等）中的二进制结构到人类可读的标签名称（如DateTimeOriginal, Make, Model等）。

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