OpImage subclass that simply transmits its source unchanged. This may be useful when an interface requires an OpImage but another sort of RenderedImage (such as a BufferedImage or TiledImage) is available. Additionally, NullOpImage is able to make use of JAI's tile caching mechanisms. Methods that get or set properties are implemented to forward the requests to the source image; no independent property information is stored in the NullOpImage itself.
@see PointOpImage
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