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java:image

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Java Image

JAI - Java Advanced Imaging

  • JAI Download. 전체 설치를 안하고 다음 두가지만 설치해도 된다.
  • 기본적으로 Native Library를 사용하도록 돼 있는데, 아래 설정을 통해 이를 방지한다.
    static {
        System.setProperty("com.sun.media.jai.disableMediaLib", "true");
    }

Image to BufferedImage

Image 객체를 BufferedImage 객체로 변환하는 방법

  • Determining If an Image Has Transparent Pixels : 위 방법에서 사용하는 hasAlpha 메소드 구현
  • // This method returns a buffered image with the contents of an image
    public static BufferedImage toBufferedImage(Image image) {
        if (image instanceof BufferedImage) {
            return (BufferedImage)image;
        }
     
        // This code ensures that all the pixels in the image are loaded
        image = new ImageIcon(image).getImage();
     
        // Determine if the image has transparent pixels; for this method's
        // implementation, see Determining If an Image Has Transparent Pixels
        boolean hasAlpha = hasAlpha(image);
     
        // Create a buffered image with a format that's compatible with the screen
        BufferedImage bimage = null;
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        try {
            // Determine the type of transparency of the new buffered image
            int transparency = Transparency.OPAQUE;
            if (hasAlpha) {
                transparency = Transparency.BITMASK;
            }
     
            // Create the buffered image
            GraphicsDevice gs = ge.getDefaultScreenDevice();
            GraphicsConfiguration gc = gs.getDefaultConfiguration();
            bimage = gc.createCompatibleImage(
                image.getWidth(null), image.getHeight(null), transparency);
        } catch (HeadlessException e) {
            // The system does not have a screen
        }
     
        if (bimage == null) {
            // Create a buffered image using the default color model
            int type = BufferedImage.TYPE_INT_RGB;
            if (hasAlpha) {
                type = BufferedImage.TYPE_INT_ARGB;
            }
            bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
        }
     
        // Copy image to buffered image
        Graphics g = bimage.createGraphics();
     
        // Paint the image onto the buffered image
        g.drawImage(image, 0, 0, null);
        g.dispose();
     
        return bimage;
    }
     
    // This method returns true if the specified image has transparent pixels
    public static boolean hasAlpha(Image image) {
        // If buffered image, the color model is readily available
        if (image instanceof BufferedImage) {
            BufferedImage bimage = (BufferedImage)image;
            return bimage.getColorModel().hasAlpha();
        }
     
        // Use a pixel grabber to retrieve the image's color model;
        // grabbing a single pixel is usually sufficient
         PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
        try {
            pg.grabPixels();
        } catch (InterruptedException e) {
        }
     
        // Get the image's color model
        ColorModel cm = pg.getColorModel();
        return cm.hasAlpha();
    }
java/image.1321865737.txt.gz · 마지막으로 수정됨: 2011/11/21 17:55 저자 kwon37xi