C#圖像處理
一、生成圖片并實現顏色漸變效果
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("漸變圖形", new Font("黑體",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、對圖片進行反轉
System.Drawing.Image drawp_w_picpath = System.Drawing.Image.FromFile(photopath);//photopath表示圖片的物理地址
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、對圖片進行縮放
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();
其他還有一些畫線、畫矩形、畫圓等的函數和方法都可以在System.Drawing中找到；
