org.geotools.styling
Class ContrastEnhancementImpl

java.lang.Object
  extended byorg.geotools.styling.ContrastEnhancementImpl
All Implemented Interfaces:
ContrastEnhancement

public class ContrastEnhancementImpl
extends java.lang.Object
implements 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

Constructor Summary
ContrastEnhancementImpl()
           
 
Method Summary
 Expression getGammaValue()
           
 Expression getType()
           
 void setGammaValue(Expression gamma)
           
 void setHistogram()
           
 void setNormalize()
           
 void setType(Expression type)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ContrastEnhancementImpl

public ContrastEnhancementImpl()
Method Detail

getGammaValue

public Expression getGammaValue()
Specified by:
getGammaValue in interface ContrastEnhancement

getType

public Expression getType()
Specified by:
getType in interface ContrastEnhancement

setGammaValue

public void setGammaValue(Expression gamma)
Specified by:
setGammaValue in interface ContrastEnhancement

setHistogram

public void setHistogram()
Specified by:
setHistogram in interface ContrastEnhancement

setNormalize

public void setNormalize()
Specified by:
setNormalize in interface ContrastEnhancement

setType

public void setType(Expression type)
Specified by:
setType in interface ContrastEnhancement


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