colorfilter.java

来自「高级java2 大学教程(含源码,经典的Java学习教程」· Java 代码 · 共 56 行

// ColorFilter.java
// ColorFilter is an Java2DImageFilter that alters the 
// RGB color bands in a BufferedImage.
package com.deitel.advjhtp1.java2d;

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

public class ColorFilter implements Java2DImageFilter {
   
   // apply color-change filter to BufferedImage
   public BufferedImage processImage( BufferedImage image ) 
   {
      // create array used to change RGB color bands
      float[][] colorMatrix = {
         { 1f, 0f, 0f },
         { 0.5f, 1.0f, 0.5f },
         { 0.2f, 0.4f, 0.6f } };
     
     // create filter to change colors
     BandCombineOp changeColors = 
        new BandCombineOp( colorMatrix, null );
     
     // create source and display Rasters
     Raster sourceRaster = image.getRaster();  
     
     WritableRaster displayRaster = 
        sourceRaster.createCompatibleWritableRaster();
     
     // filter Rasters with changeColors filter
     changeColors.filter( sourceRaster, displayRaster );
     
     // create new BufferedImage from display Raster
     return new BufferedImage( image.getColorModel(), 
        displayRaster, true, null );
  
   } // end method processImage
}

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