關於BufferedImage的處理

RenderedImage轉BufferedImage

	public BufferedImage convertRenderedImage(RenderedImage img) {
        if (img instanceof BufferedImage) {
            return (BufferedImage) img;
        }
        ColorModel cm = img.getColorModel();
        int width = img.getWidth();
        int height = img.getHeight();
        WritableRaster raster = cm.createCompatibleWritableRaster(width, height);
        boolean isAlphaPremultiplied = cm.isAlphaPremultiplied();
        Hashtable properties = new Hashtable();
        String[] keys = img.getPropertyNames();
        if (keys != null) {
            for (int i = 0; i < keys.length; i++) {
                properties.put(keys[i], img.getProperty(keys[i]));
            }
        }
        BufferedImage result = new BufferedImage(cm, raster, isAlphaPremultiplied, properties);
        img.copyData(raster);
        return result;
    }