元数据 是什么？- 概念解释
元数据是存储在文件内部的信息，描述文件本身 - 如拍摄日期、GPS 位置和相机设置
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文件元数据：简单定义
Metadata is “data about data” - information stored inside a file that describes the file itself rather than its actual content. A JPEG photo contains metadata about when it was taken, what camera was used, the GPS coordinates, and camera settings.
You cannot see metadata by just looking at a file, but it is always there. This hidden information is useful for organizing files but can also be a privacy concern when sharing photos online.
文件元数据类型
Images use EXIF (Exchangeable Image File Format) metadata to store camera settings, GPS coordinates, and timestamps. Music files use ID3 tags to store artist, album, and track information. Documents store author name, creation date, and editing history.
Many privacy-conscious users strip metadata from photos before sharing them online, since EXIF data can reveal your exact GPS location, what device you used, and when the photo was taken.
文件元数据示例
Photo EXIF data
Camera model, lens used, aperture, shutter speed, ISO, GPS location, date and time of capture.
Music ID3 tags
Song title, artist name, album, year, genre, track number, album art.
Document metadata
Author name, creation date, last modified date, software used, edit history, comments.
Video metadata
Duration, resolution, codec, frame rate, creation date, GPS location for mobile recordings.
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