我使用.getRGB()和.setRGB()来获取BufferedImage的一部分,我如何复制透明度?

时间:2011-07-13 18:07:24

标签: java transparency bufferedimage

我使用以下代码“裁剪图像”,但它忽略了透明度,因此从此方法获得的任何BufferedImages都是完全不透明的,并且似乎没有任何.getARGB()或.setARGB()方法。我该如何解决这个问题?

        private static BufferedImage getCroppedImage(BufferedImage wholeImage, int xPos, int yPos, int width, int height)
        {
            GraphicsEnvironment graphEnv = GraphicsEnvironment.getLocalGraphicsEnvironment();
            BufferedImage croppedImage = null;

            try
                {
                    GraphicsDevice screen = graphEnv.getDefaultScreenDevice();
                    GraphicsConfiguration gc = screen.getDefaultConfiguration();
                    croppedImage = gc.createCompatibleImage(width, height, Transparency.BITMASK);
                }
            catch (Exception e)
                {
                    new errorWindow(e, "crop, in Images");
                }

            if (croppedImage == null)
                {
                    croppedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
                }

            int[] pixels = new int[width * height];
            wholeImage.getRGB(xPos, yPos, width, height, pixels, 0, width);
            croppedImage.setRGB(0, 0, width, height, pixels, 0, width);

            return croppedImage;
        }

1 个答案:

答案 0 :(得分:1)

请改用Transparency.TRANSLUCENT。这不会忽略alpha值。