invertfilter.java

java 编程源代码

// InvertFilter.java
// InvertFilter is an ImageFilter that inverts a 
// BufferedImage's RGB color values.
package com.deitel.advjhtp1.java2d;

// Java core packages
import java.awt.image.*;

public class InvertFilter implements Java2DImageFilter {
   
   // apply color inversion filter to BufferedImage
   public BufferedImage processImage( BufferedImage image ) 
   {
      // create 256 color array and invert colors
      byte[] invertArray = new byte[ 256 ];
      
      for ( int counter = 0; counter < 256; counter++ )
         invertArray[ counter ] = ( byte )( 255 - counter );   
      
      // create filter to invert colors
      BufferedImageOp invertFilter = new LookupOp(
         new ByteLookupTable( 0, invertArray ), null );
      
      // apply filter to displayImage
      return invertFilter.filter( image, null );
      
   } // end method processImage
}

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 * (C) Copyright 2002 by Deitel & Associates, Inc. and         *
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