一、生成图片并实现颜色渐变效果

Response.Clear(); Bitmap imgOutput = new Bitmap(100, 50); Graphics gic = Graphics.FromImage(imgOutput); gic.Clear(Color.BlueViolet); gic.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; gic.DrawString("渐变图形", new Font("黑体",16,FontStyle.Italic),new SolidBrush(Color.White),new PointF(2,2)); gic.FillRectangle(new System.Drawing.Drawing2D.LinearGradientBrush(new Point(0,0), new Point(100,50), Color.FromArgb(0,0,0,0),Color.FromArgb(255,255,255,255)),0,0,100,50); imgOutput.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg); gic.Dispose(); imgOutput.Dispose(); Response.End(); 二、对图片进行反转 System.Drawing.Image drawp_w_picpath = System.Drawing.Image.FromFile(photopath);//photopath表示图片的物理地址 drawp_w_picpath.RotateFlip(RotateFlipType.Rotate270FlipNone); if(File.Exists(photopath)) { File.SetAttributes(photopath,FileAttributes.Normal); File.Delete(photopath); } drawp_w_picpath.Save(photopath,System.Drawing.Imaging.ImageFormat.Jpeg); drawp_w_picpath.Dispose();三、对图片进行缩放 System.Drawing.Image drawp_w_picpath = System.Drawing.Image.FromFile(photopath); Bitmap imgOutput = new Bitmap(drawp_w_picpath,60,30); imgOutput.Save(newphotppath, System.Drawing.Imaging.ImageFormat.Jpeg); imgOutput.Dispose(); Response.End();其他还有一些画线、画矩形、画圆等的函数和方法都可以在System.Drawing中找到；