package com.fire;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

public class LumAdjust {
	/**
	 * 图片亮度调整
	 * @param image
	 * @param param
	 * @throws IOException
	 */
	public void lumAdjustment(BufferedImage image, int param) throws IOException {
		if (image == null) {
			return;
		} else {
			int rgb, R, G, B;
			for (int i = 0; i < image.getWidth(); i++) {
				for (int j = 0; j < image.getHeight(); j++) {
					rgb = image.getRGB(i, j);
					R = ((rgb >> 16) & 0xff) + param;
					G = ((rgb >> 8) & 0xff) + param;
					B = (rgb & 0xff) + param;
 
					rgb = ((clamp(255) & 0xff) << 24) | ((clamp(R) & 0xff) << 16) | ((clamp(G) & 0xff) << 8)
							| ((clamp(B) & 0xff));
					image.setRGB(i, j, rgb);
				}
			}
		}
	}
 
	// 判断a,r,g,b值，大于256返回256，小于0则返回0,0到256之间则直接返回原始值
	private int clamp(int rgb) {
		if (rgb > 255)
			return 255;
		if (rgb < 0)
			return 0;
		return rgb;
	}
	
	public static void main(String[] args) throws IOException {
		System.out.println("aaaaaaaaaaaa");
		File file = new File("D://red.jpg");
		BufferedImage image = ImageIO.read(file);
		LumAdjust lumAdjust = new LumAdjust();
		lumAdjust.lumAdjustment(image, -125);
		File file2 = new File("D://2.jpg");
		file2.createNewFile();
		ImageIO.write(image, "JPG", file2);
	}
}