如何使用java 8将8位RGBA png图像转换为16位/通道的RGBA png图像？

import java.awt.image.BufferedImage;
import java.awt.image.ColorConvertOp;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferUShort;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;

public class ImageConverter {
    public static void main(String[] args) {
        String inputImagePath = "input.png";
        String outputImagePath = "output.png";

        try {
            // 读取输入图像
            BufferedImage inputImage = ImageIO.read(new File(inputImagePath));

            // 创建16位/通道的输出图像
            BufferedImage outputImage = new BufferedImage(inputImage.getWidth(), inputImage.getHeight(),
                    BufferedImage.TYPE_USHORT_555_RGB);

            // 将输入图像的像素数据复制到输出图像
            WritableRaster inputRaster = inputImage.getRaster();
            WritableRaster outputRaster = outputImage.getRaster();
            ColorConvertOp op = new ColorConvertOp(inputImage.getColorModel().getColorSpace(),
                    outputImage.getColorModel().getColorSpace(), null);
            op.filter(inputRaster, outputRaster);

            // 保存输出图像
            ImageIO.write(outputImage, "png", new File(outputImagePath));

            System.out.println("图像转换完成！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}