# Package javax.imageio.spi

A package of the Java Image I/O API containing the plug-in interfaces for readers, writers, transcoders, and streams, and a runtime registry.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  RegisterableService | An optional interface that may be provided by service provider objects that will be registered with a `ServiceRegistry`.
  ServiceRegistry.Filter | A simple filter interface used by `ServiceRegistry.getServiceProviders` to select providers matching an arbitrary criterion.

- Class Summary
  Class | Description
  --- | ---
  IIORegistry | A registry for service provider instances.
  IIOServiceProvider | A superinterface for functionality common to all Image I/O service provider interfaces (SPIs).
  ImageInputStreamSpi | The service provider interface (SPI) for `ImageInputStream`s.
  ImageOutputStreamSpi | The service provider interface (SPI) for `ImageOutputStream`s.
  ImageReaderSpi | The service provider interface (SPI) for `ImageReader`s.
  ImageReaderWriterSpi | A superclass containing instance variables and methods common to `ImageReaderSpi` and `ImageWriterSpi`.
  ImageTranscoderSpi | The service provider interface (SPI) for `ImageTranscoder`s.
  ImageWriterSpi | The service provider interface (SPI) for `ImageWriter`s.
  ServiceRegistry | A registry for service provider instances.

## Package javax.imageio.spi Description

A package of the Java Image I/O API containing the plug-in interfaces for readers, writers, transcoders, and streams, and a runtime registry.

The `javax.imageio.spi` package contains service provider interfaces for reading, writing, and transcoding images, and obtaining input and output streams, as well as a run-time registry that discovers installed service provider instances and allows new instances to be registered dynamically.

Since:
  1.4

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