图片添加水印功能

最新推荐文章于 2023-02-28 14:29:14 发布

zhangjieqq

最新推荐文章于 2023-02-28 14:29:14 发布

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分类专栏： .NET综合运用（编程示例和技巧）文章标签： textbox image path string

本文链接：https://blog.youkuaiyun.com/zhangjieqq/article/details/1609487

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本文介绍了一种使用 C# 在图片上添加水印的方法。通过从文件加载图片，并设置绘图质量，接着绘制水印图像，最后保存带有水印的图片。文章提供了完整的代码示例。

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简单贴一段代码(有些元素已经被定义过，这里不详细定义):

                    System.Drawing.Image bitmap = System.Drawing.Image.FromFile(picpath);
                    System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
                    g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
                    g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

                    string path = Server.MapPath("..");
                    System.Drawing.Image imagewater;
                    imagewater = System.Drawing.Image.FromFile(path + "//images//" + Image1.ImageUrl.Substring(Image1.ImageUrl.LastIndexOf("/") + 1));
                     g.DrawImage(imagewater, 0, 0, imagewater.Width, imagewater.Height);
                    g.Dispose();
                    ImageCodecInfo myImageCodecInfo;
                    System.Drawing.Imaging.Encoder myEncoder;
                    EncoderParameter myEncoderParameter;
                    EncoderParameters myEncoderParameters;
                    myImageCodecInfo = ImageCodecInfo.GetImageEncoders()[1];
                    myEncoder = System.Drawing.Imaging.Encoder.Quality;
                    myEncoderParameters = new EncoderParameters(1);
                    myEncoderParameter = new EncoderParameter(myEncoder, Convert.ToInt64(TextBox2.Text.Trim())); // 0-100
                    myEncoderParameters.Param[0] = myEncoderParameter;

                    bitmap.Save(picpath + "1", myImageCodecInfo, myEncoderParameters);
                    bitmap.Dispose();
                    System.IO.File.Delete(picpath);
                    System.IO.File.Move(picpath + "1", picpath);
                    MyMessageBox.Show(this, "水印添加完毕！");

需要引用的命名空间：

using System.IO;
using System.Drawing;
using System.Drawing.Imaging;