从BufferedImage中高效地提取RGBA缓冲区

BufferedImage image = ...; // 从某个地方获取BufferedImage对象

int width = image.getWidth();
int height = image.getHeight();
int[] pixels = new int[width * height];

image.getRGB(0, 0, width, height, pixels, 0, width);

for (int i = 0; i < pixels.length; i++) {
    int pixel = pixels[i];
    int alpha = (pixel >> 24) & 0xFF;
    int red = (pixel >> 16) & 0xFF;
    int green = (pixel >> 8) & 0xFF;
    int blue = pixel & 0xFF;

    // 在这里可以对提取出的RGBA值进行处理或使用
}