The image data may take the form of either a RenderedImage, or a Raster. Reader methods that return an IIOImage will always return a BufferedImage using the RenderedImage reference. Writer methods that accept an IIOImage will always accept a RenderedImage, and may optionally accept a Raster.
Exactly one of getRenderedImage and getRaster will return a non-null value. Subclasses are responsible for ensuring this behavior.
@see ImageReader#readAll(int,ImageReadParam)
@see ImageReader#readAll(java.util.Iterator)
@see ImageWriter#write(ae.javax.imageio.metadata.IIOMetadata,IIOImage,ImageWriteParam)
@see ImageWriter#write(IIOImage)
@see ImageWriter#writeToSequence(IIOImage,ImageWriteParam)
@see ImageWriter#writeInsert(int,IIOImage,ImageWriteParam)
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