9.4. Reading Metadata of Images
If you have ever worked with mechanical and engineering drawings or digital images, you are probably aware of metadata. Metadata is information about the image, that’s not part of the image itself. When an engineer draws an image, metadata is often added, such as the following information: last updated, updated by, date, place, and names. A photograph might include metadata such as image title, manufacturer, and model.
In the .NET Framework library, the PropertyItem object is used as a placeholder for metadata. The PropertyItem class provides four properties: Id, Len, Type, and Value. All of these properties have both read and write access.
The Id property is a tag, which identifies the metadata item. Table 9.10 ...
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