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# Metadata Support

Metadata is data about an image, as distinct from the actual image data (pixels). This includes everything from the basic width/height and datatype information up to geospatial information, background colors, creation dates, etc.

The MrSID SDK uses a key/value pair system for recording tags and their values, similar to the system used by TIFF and GeoTIFF. A “metadata database” containing a set of records, one for each key/value pair, is associated with each image. This chapter describes the basic features and classes of this metadata system.

The metadata classes can all be found in the headers in the include directory. Full details and examples may be found in the Reference Manual.

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The Metadata Record

The Metadata Database

The Tags