Java 手写签字去除背景 背景透明

Java 手写签字去除背景 背景透明

/**
 * 白底照片去除白底 形成透明底图片
 * @param file  需要去除背景的图片
 * @param Path  去除背景后保存图片的路径
 * @return  true 则去除成功 ，false 则失败
 */
public static boolean localImgToAlpha(File file, String Path) {
    try {
        BufferedImage bi = ImageIO.read(new FileInputStream(file));
        ImageIcon imageIcon = new ImageIcon(bi);
        BufferedImage bufferedImage = new BufferedImage(imageIcon.getIconWidth(), imageIcon.getIconHeight(),
                BufferedImage.TYPE_4BYTE_ABGR);
        Graphics2D g2D = (Graphics2D) bufferedImage.getGraphics();
        g2D.drawImage(imageIcon.getImage(), 0, 0, imageIcon.getImageObserver());
        int alpha = 0;
        for (int j1 = bufferedImage.getMinY(); j1 < bufferedImage.getHeight(); j1++) {
            for (int j2 = bufferedImage.getMinX(); j2 < bufferedImage.getWidth(); j2++) {
                int rgb = bufferedImage.getRGB(j2, j1);
                int R = (rgb & 0xff0000) >> 16;
                int G = (rgb & 0xff00) >> 8;
                int B = (rgb & 0xff);
                if (((255 - R) < 30) && ((255 - G) < 30) && ((255 - B) < 30)) {
                    rgb = ((alpha + 1) << 24) | (rgb & 0x00ffffff);
                }
                bufferedImage.setRGB(j2, j1, rgb);
            }
        }
        g2D.drawImage(bufferedImage, 0, 0, imageIcon.getImageObserver());
        ImageIO.write(bufferedImage, "png", new File(Path));// 直接输出文件
        return true;
    } catch (Exception e) {
        e.printStackTrace();
        return false;
    }
}