colorconvert.java

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package colorconvert;

/**
 * <p>Title: ColorConvert</p>
 * <p>Description: 实现颜色空间转换</p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: 中国农业大学计算机系</p>
 * @author 彭波
 * @version 1.0
 */

	import java.awt.*;
	import java.awt.image.*;
	import java.awt.geom.*;
        import java.awt.color.ColorSpace;
	import javax.swing.*;
	import javax.swing.JPanel;


	public class ColorConvert extends JPanel {
	  private Image img;
	  public int w;
	  public int h;
          private static Color colors[] = { Color.red, Color.pink, Color.orange,
            Color.yellow, Color.green, Color.magenta, Color.cyan, Color.blue};
	  float[] elements = {0.0f, -1.0f, 0.0f,-1.0f, 4.f, -1.0f,0.0f, -1.0f, 0.0f};
	  public ColorConvert(){
	    img = getToolkit().getImage(
				ClassLoader.getSystemResource("Image.gif"));
	    MediaTracker mt = new MediaTracker(this);		// 加载图片
	    mt.addImage(img,0);
	    try{												// 判断图片是否完全加载
	      mt.waitForAll();
	    }
	    catch(Exception err){
	      err.printStackTrace();
	    }
	    w = img.getWidth(this);
	    h = img.getHeight(this);
	    this.setSize(w*2,h*2);
	  }
	  public void paintComponent(Graphics g){
	    super.paintComponent(g);

            ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);
            BufferedImage bi = new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);
	    Graphics2D big = bi.createGraphics();
	    big.drawImage(img,0,0,this);
	    BufferedImageOp biop = null;
	    AffineTransform at = new AffineTransform();
	    BufferedImage bimg = new BufferedImage(w,h, BufferedImage.TYPE_INT_RGB);
	    Kernel kernel = new Kernel(3,3,elements);
	    ColorConvertOp cop = new ColorConvertOp(cs,null);	// 创建灰化颜色转换器
	    cop.filter(bi,bimg);
	    biop = new AffineTransformOp(
			at,AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
	    Graphics2D g2d = (Graphics2D)g;

            g2d.drawImage(img, 0, 0, w, h, null);
            g2d.drawImage(bimg, w, 0, w, h, null);

//	    g2d.drawImage(bimg,biop,0,0);	// 显示缓冲区中的图像
	  }
	}