生成小图

 

public void GetSmallImage(string ImagePath, int width)
        ...{
            File.Copy(ImagePath, ImagePath + ".jpg");
            Bitmap bitmap = new Bitmap(width, Convert.ToInt32((double)(width * 0.75)));
            System.Drawing.Image image = System.Drawing.Image.FromFile(ImagePath + ".jpg");
            Graphics graphics = Graphics.FromImage(bitmap);
            graphics.CompositingQuality = CompositingQuality.HighQuality;
            graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
            graphics.SmoothingMode = SmoothingMode.HighQuality;
            graphics.DrawImage(image, new Rectangle(0, 0, bitmap.Width, bitmap.Height), 0, 0, image.Width, image.Height, GraphicsUnit.Pixel);
            graphics.Dispose();
            bitmap.Save(ImagePath);
            bitmap.Dispose();
            image.Dispose();
            File.Delete(ImagePath + ".jpg");
        }