java调整图片的亮度，java调整图片亮度,package cn.o

java调整图片的亮度，java调整图片亮度,package cn.o

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);        }    }}