FECipherVit.ImageHelper.GetThumbnailImage C# (CSharp) Method

        public static Image GetThumbnailImage(Image image, int width, int height)
        {
            if (image == null || width < 1 || height < 1)
                return null;
            // 新建一个bmp图片
            Image bitmap = new System.Drawing.Bitmap(width, height);

            // 新建一个画板
            using (Graphics g = System.Drawing.Graphics.FromImage(bitmap))
            {

                // 设置高质量插值法
                g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;

                // 设置高质量,低速度呈现平滑程度
                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

                // 高质量、低速度复合
                g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;

                // 清空画布并以透明背景色填充
                g.Clear(Color.Transparent);

                // 在指定位置并且按指定大小绘制原图片的指定部分
                g.DrawImage(image, new Rectangle(0, 0, width, height),
                    new Rectangle(0, 0, image.Width, image.Height),
                    GraphicsUnit.Pixel);
                return bitmap;
            }
        }