C# 上传图片，生成缩略图，生成文字或图像水印图

//处理原图片
Graphics g = Graphics.FromImage(image);
Font f = new Font("隶书", 16);
Brush b = new SolidBrush(ColorTranslator.FromHtml("#FF0000"));
string addText = "文字水印内容";
g.DrawString(addText, f, b, 10, 10);
g.DrawImageUnscaled(syimage, 50, 50);
//g.DrawImage(newimage,50,50,100,100);