This demo uses raster operations to manipulate layer based data.
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This example manipulates data in a OpenLayers.Raster.Composite
using a series of OpenLayers.Raster.Operation methods.
RGB data from the WMS layer is translated to HSL, modified using
user supplied values, and translated back to RGB. The resulting
composite is displayed on the map with a OpenLayers.Layer.Raster.
See the raster-operations.js source for details on how this is done.