Introduced a cast(T) method into the ImageUtils template functor to allow code reading images to handle casting from source data to a form that a user can use more conviently

src/osg/ImageUtils.cpp

@@ -22,7 +22,7 @@
 namespace osg
 {
 
-struct FindRangeOperator
+struct FindRangeOperator : public CastAndScaleToFloatOperation
 {
     FindRangeOperator():
         _rmin(FLT_MAX),
@@ -168,7 +168,7 @@ void _copyRowAndScale(const unsigned char* src, GLenum srcDataType, unsigned cha
     }
 }
 
-struct RecordRowOperator
+struct RecordRowOperator : public CastAndScaleToFloatOperation
 {
     RecordRowOperator(unsigned int num):_colours(num),_pos(0) {}
 

src/osgPlugins/dicom/ReaderWriterDICOM.cpp

@@ -168,7 +168,7 @@ class ReaderWriterDICOM : public osgDB::ReaderWriter
             tile->setVolumeTechnique(new osgVolume::RayTracedTechnique());
 
             osg::ref_ptr<osgVolume::ImageLayer> layer= new osgVolume::ImageLayer(result.getImage());
-            layer->rescaleToZeroToOneRange();
+            //layer->rescaleToZeroToOneRange();
 
             osgVolume::SwitchProperty* sp = new osgVolume::SwitchProperty;
             sp->setActiveProperty(0);

src/osgVolume/Layer.cpp

@@ -491,7 +491,7 @@ osg::Image* osgVolume::createNormalMapTexture(osg::Image* image_3d)
 //
 // applyTransferFunction
 //
-struct ApplyTransferFunctionOperator
+struct ApplyTransferFunctionOperator : public osg::CastAndScaleToFloatOperation
 {
     ApplyTransferFunctionOperator(osg::TransferFunction1D* tf, unsigned char* data):
         _tf(tf),