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【Java】 java调整图片的亮度
作者:april / 发布于2015/1/12/ 402

	package cn.outofmemory.snippets.desktop;

	import java.awt.Component;
	import java.awt.Frame;
	import java.awt.Graphics;
	import java.awt.Graphics2D;
	import java.awt.GraphicsConfiguration;
	import java.awt.GraphicsDevice;
	import java.awt.GraphicsEnvironment;
	import java.awt.Image;
	import java.awt.Toolkit;
	import java.awt.Transparency;
	import java.awt.image.BufferedImage;
	import java.awt.image.ImageObserver;
	import java.awt.image.RescaleOp;

	public class BufferedImageSaturation {

	 static BufferedImage image;
	 static boolean imageLoaded = false;

	 public static void main(String[] args) {

	 // The ImageObserver implementation to observe loading of the image
	 ImageObserver myImageObserver = new ImageObserver() {
	 public boolean imageUpdate(Image image, int flags, int x, int y, int width, int height) {
	 if ((flags & ALLBITS) != 0) {
	 imageLoaded = true;
	 System.out.println("Image loading finished!");
	 return false;
	 }
	 return true;
	 }
	 };

	 // The image URL - change to where your image file is located!
	 String imageURL = "image.png";

	 /*
	 * This call returns immediately and pixels are loaded in the background
	 * We use an ImageObserver to be notified when the loading of the image
	 * is complete
	 */
	 Image sourceImage = Toolkit.getDefaultToolkit().getImage(imageURL);
	 sourceImage.getWidth(myImageObserver);

	 // We wait until the image is fully loaded
	 while (!imageLoaded) {
	 try {
	 Thread.sleep(100);
	 } catch (InterruptedException e) {
	 }
	 }

	 // Create a buffered image from the source image with a format that's compatible with the screen
	 GraphicsEnvironment graphicsEnvironment = GraphicsEnvironment.getLocalGraphicsEnvironment();
	 GraphicsDevice graphicsDevice = graphicsEnvironment.getDefaultScreenDevice();
	 GraphicsConfiguration graphicsConfiguration = graphicsDevice.getDefaultConfiguration();

	 // If the source image has no alpha info use Transparency.OPAQUE instead
	 image = graphicsConfiguration.createCompatibleImage(sourceImage.getWidth(null), sourceImage.getHeight(null), Transparency.BITMASK);

	 // Copy image to buffered image
	 Graphics graphics = image.createGraphics();

	 // Paint the image onto the buffered image
	 graphics.drawImage(sourceImage, 0, 0, null);
	 graphics.dispose();

	 // Brighten the image by 20%
	 float scaleFactor = 1.2f;
	 RescaleOp op = new RescaleOp(scaleFactor, 0, null);
	 image = op.filter(image, null);

	 // Darken the image by 5%
	 scaleFactor = 0.5f;
	 op = new RescaleOp(scaleFactor, 0, null);
	 image = op.filter(image, null);

	 // Create frame with specific title
	 Frame frame = new Frame("Example Frame");

	 // Add a component with a custom paint method
	 frame.add(new CustomPaintComponent());

	 // Display the frame
	 int frameWidth = 300;
	 int frameHeight = 300;
	 frame.setSize(frameWidth, frameHeight);

	 frame.setVisible(true);

	 }

	 /*
	 * To draw on the screen, it is first necessary to subclass a Component and
	 * override its paint() method. The paint() method is automatically called
	 * by the windowing system whenever component's area needs to be repainted.
	 */
	 static class CustomPaintComponent extends Component {

	 public void paint(Graphics g) {

	 // Retrieve the graphics context; this object is used to paint
	 // shapes
	 Graphics2D g2d = (Graphics2D) g;

	 /*
	 * Draw an Image object The coordinate system of a graphics context
	 * is such that the origin is at the northwest corner and x-axis
	 * increases toward the right while the y-axis increases toward the
	 * bottom.
	 */
	 int x = 0;
	 int y = 0;
	 g2d.drawImage(image, x, y, this);

	 }

	 }

	}
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　图片的亮度　
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