# Uses of Package
javax.imageio.spi

- Packages that use javax.imageio.spi
  Package | Description
  --- | ---
  javax.imageio | The main package of the Java Image I/O API.
  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.

- Classes in javax.imageio.spi used by javax.imageio
  Class | Description
  --- | ---
  ImageReaderSpi | The service provider interface (SPI) for `ImageReader`s.
  ImageWriterSpi | The service provider interface (SPI) for `ImageWriter`s.

- Classes in javax.imageio.spi used by javax.imageio.spi
  Class | Description
  --- | ---
  IIORegistry | A registry for Image I/O service provider instances.
  IIOServiceProvider | A superinterface for functionality common to all Image I/O service provider interfaces (SPIs).
  ImageReaderWriterSpi | A superclass containing instance variables and methods common to `ImageReaderSpi` and `ImageWriterSpi`.
  RegisterableService | An optional interface that may be provided by service provider objects that will be registered with a `ServiceRegistry`.
  ServiceRegistry | A registry for service provider instances for Image I/O service types.
  ServiceRegistry.Filter | A simple filter interface used by `ServiceRegistry.getServiceProviders` to select providers matching an arbitrary criterion.