通过修改图片的rgb来改变图片的亮度

[java]代码库

package com.sxt.img;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Dictionary;
import java.util.Hashtable;

import javax.imageio.ImageIO;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

/**
 * 手动实现改变图片的亮度 修改图片的rgb
 * 
 * @author Danny
 * 
 */
public class ImageProcessDemo extends JFrame
{
	private JPanel panel = null;
	private JSlider slider = null;
	private BufferedImage img = null;
	private int value = 0;

	public ImageProcessDemo()
	{
		initComponent();
		this.setVisible(true);
	}

	private void initComponent()
	{
		this.setTitle("图片处理测试");
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setSize(500, 400);
		this.setLocationRelativeTo(null);

		initImg(new File("a.jpg"));

		panel = new JPanel()
		{
			@Override
			protected void paintComponent(Graphics g)
			{
				super.paintComponent(g);
				Graphics2D g2 = (Graphics2D) g;
				g2.drawImage(img, 0, 0, this.getWidth(), this.getHeight(), null);
			}
		};

		this.add(panel, BorderLayout.CENTER);

		panel.setLayout(new BorderLayout());
		slider = new JSlider();
		slider.setValue(50);
		slider.setPaintLabels(true);
		slider.setPaintTicks(true);
		slider.setMajorTickSpacing(100);
		slider.setMinorTickSpacing(5);
		Dictionary<Integer, Component> labels = new Hashtable<Integer, Component>();
		for (int i = 0; i <= 100; i += 5)
		{
			labels.put(i, new JLabel("" + i));
		}
		slider.setLabelTable(labels);

		value = slider.getValue();

		slider.addChangeListener(new ChangeListener()
		{
			@Override
			public void stateChanged(ChangeEvent e)
			{
				if (slider.getValueIsAdjusting())
				{
					int changeValue = slider.getValue() - value;
					processImg(changeValue);
					value = slider.getValue();
				}
			}
		});

		Box box = new Box(BoxLayout.X_AXIS);
		box.add(new JLabel("亮度调节："));
		box.add(slider);
		this.add(box, BorderLayout.NORTH);
	}

	private void initImg(File file)
	{
		try
		{
			img = ImageIO.read(file);
		} catch (IOException e)
		{
			JOptionPane.showMessageDialog(null, "图片不存在!");
		}
	}

	/**
	 * 处理图片
	 * 
	 */
	private void processImg(int changeValue)
	{
		for (int x = 0; x < img.getWidth(); x++)
		{
			for (int y = 0; y < img.getHeight(); y++)
			{
				// 获取到rgb的组合值
				int rgb = img.getRGB(x, y);
				Color color = new Color(rgb);
				int r = color.getRed() + changeValue;
				int g = color.getGreen() + changeValue;
				int b = color.getBlue() + changeValue;
				if (r > 255)
				{
					r = 255;
				} else if (r < 0)
				{
					r = 0;
				}

				if (g > 255)
				{
					g = 255;
				} else if (g < 0)
				{
					g = 0;
				}

				if (b > 255)
				{
					b = 255;
				} else if (b < 0)
				{
					b = 0;
				}

				color = new Color(r, g, b);
				img.setRGB(x, y, color.getRGB());
			}
		}
		panel.repaint();
	}

	public static void main(String[] args)
	{
		new ImageProcessDemo();
	}

}

[代码运行效果截图]