调整Webp图像的大小

Question

我已将Jpg转换为Webp，但我想在此处调整图像的大小，请输入代码

using (Bitmap bitmap = new Bitmap(UploadName +jpgFileName))
{
    using (var saveImageStream = System.IO.File.Open(webpFileName, FileMode.Create))
    {
        var encoder = new SimpleEncoder();
        encoder.Encode(bitmap, saveImageStream, 90);
    }
}