e680. brightening or darkening an rgb buffered image.txt

这里面包含了一百多个JAVA源文件

This example demonstrates how to brighten or darken an RGB buffered image by scaling the red, green, and blue values in the image. 
    // To create a buffered image, see e666 Creating a Buffered Image
    
    // Brighten the image by 30%
    float scaleFactor = 1.3f;
    RescaleOp op = new RescaleOp(scaleFactor, 0, null);
    bufferedImage = op.filter(bufferedImage, null);
    
    // Darken the image by 10%
    scaleFactor = .9f;
    op = new RescaleOp(scaleFactor, 0, null);
    bufferedImage = op.filter(bufferedImage, null);

If the image is not an RGB image, the following code converts a non-RGB image to an RGB buffered image: 
    // Get non-RGB image
    Image image = new ImageIcon("image.gif").getImage();
    
    // Create an RGB buffered image
    BufferedImage bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_RGB);
    
    // Copy non-RGB image to the RGB buffered image
    Graphics2D g = bimage.createGraphics();
    g.drawImage(image, 0, 0, null);
    g.dispose();