public BufferedImage rotate90DX(BufferedImage bi)
{
    int width = bi.getWidth();
    int height = bi.getHeight();

    BufferedImage biFlip = new BufferedImage(height, width, bi.getType());

    for(int i=0; i<width; i++)
        for(int j=0; j<height; j++)
            biFlip.setRGB(height-1-j, width-1-i, bi.getRGB(i, j));

    return biFlip;
}

public BufferedImage rotate90SX(BufferedImage bi)
{
    int width = bi.getWidth();
    int height = bi.getHeight();

    BufferedImage biFlip = new BufferedImage(height, width, bi.getType());

    for(int i=0; i<width; i++)
        for(int j=0; j<height; j++)
            biFlip.setRGB(j, i, bi.getRGB(i, j));

    return biFlip;
}