An interface to be implemented by objects that can determine the settings of an
An object describing the structure of metadata documents returned from
An abstract class to be extended by objects that represent metadata (non-image data) associated with images and streams.
A concrete class providing a reusable implementation of the
A class representing a node in a meta-data tree, which implements the
When reading an image, its per-stream and per-image metadata is made
available as an
IIOMetadata object. The internals of
this object are specific to the plug-in that created it. Its contents
may be accessed in the form of an XML
Document, which is
implemented as a tree of
When writing an image, its metadata may be set by defining or
IIOMetadata object. Such an object may be
obtained from an
ImageTranscoder (from the
javax.imageio package). Once such an object has
been obtained, its contents may be set of modified via a
Document consisting of
The document format may optionally be described using an
The format of the metadata contained in the XML
is identified by a string which appears as the root node of the tree
IIOMetadataNode objects. This string contains a version
number, e.g. "javax_imageio_jpeg_image_1.0". Readers and writers may
support multiple versions of the same basic format and the Image I/O
API has methods that allow specifying which version to use by passing
the string to the method/constructor used to obtain an
object. In some cases, a more recent version may not be strictly
compatible with a program written expecting an older version (for
an example, see the Native Metadata Format section of the JPEG Metadata
Usage Notes below).
Plug-ins may choose to support a standard (plug-in neutral) format. This format does not provide lossless encoding of metadata, but allows a portion of the metadata to be accessed in a generic manner.
Each of the standard plug-ins supports a so-called "native" metadata format, which encodes its metadata losslessly:
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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