Examples of org.geotools.styling.ContrastEnhancement

org.geotools.styling.ContrastEnhancement
The ContrastEnhancement object defines contrast enhancement for a channel of a false-color image or for a color image. Its format is:
```
 <xs:element name="ContrastEnhancement"> <xs:complexType> <xs:sequence> <xs:choice minOccurs="0"> <xs:element ref="sld:Normalize"/> <xs:element ref="sld:Histogram"/> </xs:choice> <xs:element ref="sld:GammaValue" minOccurs="0"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="Normalize"> <xs:complexType/> </xs:element> <xs:element name="Histogram"> <xs:complexType/> </xs:element> <xs:element name="GammaValue" type="xs:double"/> 
```
In the case of a color image, the relative grayscale brightness of a pixel color is used. ?Normalize? means to stretch the contrast so that the dimmest color is stretched to black and the brightest color is stretched to white, with all colors in between stretched out linearly. ?Histogram? means to stretch the contrast based on a histogram of how many colors are at each brightness level on input, with the goal of producing equal number of pixels in the image at each brightness level on output. This has the effect of revealing many subtle ground features. A ?GammaValue? tells how much to brighten (value greater than 1.0) or dim (value less than 1.0) an image. The default GammaValue is 1.0 (no change). If none of Normalize, Histogram, or GammaValue are selected in a ContrastEnhancement, then no enhancement is performed. @author iant @source $URL$

            channelNum[GREEN] = 2;
            channelNum[BLUE] = 3;
        }
        // Now we create a RasterSymbolizer using the selected channels
        SelectedChannelType[] sct = new SelectedChannelType[cov.getNumSampleDimensions()];
        ContrastEnhancement ce = styleFactory.contrastEnhancement(filterFactory.literal(1.0), ContrastMethod.NORMALIZE);
        for( int i = 0; i < 3; i++ ) {
            sct[i] = styleFactory.createSelectedChannelType(String.valueOf(channelNum[i]), ce);
        }
        RasterSymbolizer sym = styleFactory.getDefaultRasterSymbolizer();
        ChannelSelection sel = styleFactory.channelSelection(sct[RED], sct[GREEN], sct[BLUE]);

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         * @param hints
         * @throws OperationNotSupportedException
         */
        public Object getValue( Element element, ElementValue[] value, Attributes attrs1, Map hints )
                throws OperationNotSupportedException, SAXException {
            ContrastEnhancement symbol = new ContrastEnhancementImpl();


            for (int i = 0; i < value.length; i++) {
                if ((value[i] == null) || value[i].getElement() == null) {
                    continue;
                }


                Element e = value[i].getElement();
                if(elems[NORMALIZE].getName().equals(e.getName()))
                    symbol.setNormalize(); // (Graphic)value[i].getValue()


                if(elems[HISTORGRAM].getName().equals(e.getName()))
                    symbol.setHistogram(); // (Graphic)value[i].getValue()


                if(elems[GAMMAVALUE].getName().equals(e.getName())){
                    FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2();
                    symbol.setGammaValue(ff.literal( ((Double)value[i].getValue()).doubleValue()));
                }
            }
            
            return symbol;
        }

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    return dap;
  }


  /** Internal parse method - made protected for unit testing */
  protected ContrastEnhancement parseContrastEnhancement(Node root) {
    ContrastEnhancement symbol = new ContrastEnhancementImpl();


    NodeList children = root.getChildNodes();
    final int length = children.getLength();
    for (int i = 0; i < length; i++) {
      Node child = children.item(i);


      if ((child == null) || (child.getNodeType() != Node.ELEMENT_NODE)) {
        continue;
      }
      String childName = child.getLocalName();
      if (childName == null) {
        childName = child.getNodeName();
      }


      if (childName.equalsIgnoreCase("Normalize")) {
        symbol.setNormalize();
      } else if (childName.equalsIgnoreCase("Histogram")) {
        symbol.setHistogram();
      } else if (childName.equalsIgnoreCase("Logarithmic")) {
        symbol.setLogarithmic();
      } else if (childName.equalsIgnoreCase("Exponential")) {
        symbol.setExponential();
      } else if (childName.equalsIgnoreCase("GammaValue")) {
        try {
          final String gammaString = getFirstChildValue(child);
          symbol.setGammaValue(ff.literal(Double
              .parseDouble(gammaString)));
        } catch (Exception e) {
          if (LOGGER.isLoggable(Level.WARNING))
            LOGGER.log(Level.WARNING, e.getLocalizedMessage(), e);
        }

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