Csharp 使用 System.Drawing.Imaging 保存 webp 文件会生成较大的文件大小或编码器不存在

所以我使用.NET 7，因为System.Drawing.Imaging可以(或似乎可以)使用以下代码将文件另存为webp文件:

            pictureBox1.Image = image; //image is a Bitmap
           image.Save(folderpath, ImageFormat.Webp); 

非常靠前，但保存的图像占716kb，但其大小为640x480

How can I reduce the file size?个

I found a lot of answers about reduce the image size, but is not my case, already reduced, and I'm wonder why a webp file will be so big, because the quality also is very poor (webcam image).
Using the PNG format ocuppies the same space on disk.

最新情况:

因此，我可以使用MSDN中的以下代码来降低PNG的"质量":

if (capture.IsOpened())
            {
                capture.Read(frame);
                image = BitmapConverter.ToBitmap(frame);
                if (pictureBox1.Image != null)
                {
                    pictureBox1.Image.Dispose();
                }
                pictureBox1.Image = image;



                ImageCodecInfo myImageCodecInfo;
                System.Drawing.Imaging.Encoder myEncoder;
                EncoderParameter myEncoderParameter;
                EncoderParameters myEncoderParameters;

                myImageCodecInfo = GetEncoder("image/webp");

                myEncoderParameters = new EncoderParameters(1);
                myEncoder = System.Drawing.Imaging.Encoder.Quality;
                // Save the bitmap as a JPEG file with quality level 25.
                myEncoderParameter = new EncoderParameter(myEncoder, 25L);
                myEncoderParameters.Param[0] = myEncoderParameter;
                // and now save it to the file

                image.Save(filename, myImageCodecInfo, myEncoderParameters); 

            }

使用此方法的:

   public static ImageCodecInfo GetEncoder(string mimetype)
    {
        return ImageCodecInfo.GetImageEncoders().FirstOrDefault(e => e.MimeType == mimetype);
    }

但我不明白为什么如果Save()允许我另存为webp文件，为什么ImageCodecInfo.GetImageEncoders()中没有编码器来MIME TYPE WebP