如何使.NET以PARGB32格式保存TIFF文件？

using System.Drawing;
using System.Drawing.Imaging;

public class TiffSaver
{
    public void SaveAsPARGB32(string filePath, Bitmap bitmap)
    {
        // 设置保存格式为PARGB32
        var encoderParameters = new EncoderParameters(1);
        encoderParameters.Param[0] = new EncoderParameter(Encoder.ColorDepth, 32L);

        // 获取TIFF编码器
        var tiffCodecInfo = GetTiffCodecInfo();

        // 保存TIFF文件
        bitmap.Save(filePath, tiffCodecInfo, encoderParameters);
    }

    private ImageCodecInfo GetTiffCodecInfo()
    {
        var codecs = ImageCodecInfo.GetImageEncoders();
        foreach (var codec in codecs)
        {
            if (codec.MimeType == "image/tiff")
            {
                return codec;
            }
        }
        return null;
    }
}