图片添加透明文字水印

实现:通过GDI+中颜色是ARGB格式的(a,r,g,b)a透明度0-100,100表示不透明,0表示完全透明,r红色,g绿色,b蓝色

new SolidBrush(Color.FromArgb(80,70,140,40))

例子:

图片添加透明文字

using System;

using System.Drawing;

using System.Drawing.Imaging;

using System.IO;

namespace IPImage

{

public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

Response.ContentType = "image/jpeg";

Font font = new Font("Arial", 22);

string strFileName = @"D:\images\IpImg.bmp";

Image MyImage = Image.FromFile(strFileName);

Bitmap OutPut = new Bitmap(MyImage);

Graphics GImage = Graphics.FromImage(OutPut);

GImage.DrawString("第8工作室.热诚为您服务.", font, new SolidBrush(Color.FromArgb(80,70,140,40)),10,85);

OutPut.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);

GImage.Dispose();

OutPut.Dispose();

MyImage.Dispose();

}

}

}

附源码:下载