image缩小.java

利用java实现将一副图片按照4：1的格式缩小

import javax.imageio.*;//ImageIO

import java.awt.image.BufferedImage;//BufferedImage  
import   java.io.*;   //File   IOException
public class Image缩小 {
	public static void main(String[] args)  throws Exception{
		RgbHsv bo = new RgbHsv();
		BufferedImage  abc = bo.返回BufferedImage对象("D:/Backup/我的文档/My Pictures/power5.jpg");
		
		//这两种格式都可以获得正确结果
		int srcw = abc.getWidth();// 原图像的宽度 srcw = 1024
		int srch = abc.getHeight(null);// 原图像的高度 srch = 768
		
		BufferedImage  uut = new BufferedImage(srcw / 2, srch / 2, 8) ;//依次构造生成的图像的宽度、高度、每一个RGB的位数
		
		for(int i = 0; i < srcw -1; i += 2)
		for(int j = 0; j < srch - 1; j += 2){
			int rgb00 = abc.getRGB(i, j);
			int rgb01 = abc.getRGB(i, j + 1);
			int rgb10 = abc.getRGB(i + 1, j);
			int rgb11 = abc.getRGB(i + 1, j + 1);
			
			int r00 = (rgb00 & 0xff0000) >> 16;//获取r
			int g00 = (rgb00 & 0x00ff00) >> 8;//获取b
			int b00 = (rgb00 & 0x0000ff);//获取g
			
			int r01 = (rgb01 & 0xff0000) >> 16;//获取r
			int g01 = (rgb01 & 0x00ff00) >> 8;//获取b
			int b01 = (rgb01 & 0x0000ff);//获取g
			
			int r10 = (rgb10 & 0xff0000) >> 16;//获取r
			int g10 = (rgb10 & 0x00ff00) >> 8;//获取b
			int b10 = (rgb10 & 0x0000ff);//获取g
			
			int r11 = (rgb11 & 0xff0000) >> 16;//获取r
			int g11 = (rgb11 & 0x00ff00) >> 8;//获取b
			int b11 = (rgb11 & 0x0000ff);//获取g
			
			int r = (r00 + r01 + r10 + r11) / 4;
			int g = (g00 + g01 + g10 + g11) / 4;
			int b = (b00 + b01 + b10 + b11) / 4;
			
			int rgb = (r << 16) + (g << 8) + b;
			
			uut.setRGB(i / 2, j / 2, rgb);
			
		}
	
		ImageIO.write(uut, "jpg",new File("D:/Backup/我的文档/My Pictures/power5s图像缩小.jpg"));
	}
	
}