====== Java Image Representation ======


In a java image, each pixel is represented by a series of bands.  In RGB there is a band for red, green and blue.  In CMYK there are bands for cyan, magenta, yellow and black.

There are a few basic classes used in Java2D:
  * **DataBuffer** which simply wraps data arrays into bands.
  * **Raster** stores a DataBuffer and represents it as a rectangular array of pixels and bands which is described by a SampleModel.  It is read only.
  * **SampleModel** describes how to access the individual pixels within a Raster.
  * **WriteableRaster** inherets from Raster and implements methods for writing data as well.
  * **ColorModel** is a class that determines what each of the bands are in colormetric space.  It is only used by Java2D, not JAI.

====== Rendered vs. Renderable ======

**Renderable Layer** is a layer that has no specific context and can be run through a series of operations that contain parameters.  It can be rendered once is it called upon by some specific context like a screen display or printer.  The parameters for filters are editable.

//Any object that falls in this layer is expected to adapt to a RenderContext.//

**Rendered Layer** is a layer that does have a specific context.  It can also be pulled through a chain of operations, but the operations must be //context specific//.  The parameters for filter are not editable.

**RenderableImageOps** are filters that operate within the Renderable Layer and must implement RenderableImage as its output will conform to that interface.