C# 图片添加水印

古城微笑少年丶 2021-06-26 16:06 756阅读 0赞

## 调用 ##

WaterMarkHelper.AddWaterMark(@"C:\Users\xxxue\Desktop\QQ图片20180704142029.jpg", @"C:\Users\xxxue\Desktop\123.jpg");

## 核心方法 ##

using System;
    using System.Drawing;
    using System.Drawing.Drawing2D;
    using System.Drawing.Imaging;
    using System.IO;
    using System.Linq;
    
    namespace ConsoleApp2
    { 
        public class WaterMarkHelper
        {   
    
            /// <summary>
            /// 添加水印
            /// </summary>
            /// <param name="imgPath">原图片地址</param>
            /// <param name="sImgPath">水印图片地址</param>
            /// <returns>resMsg[0] 成功,失败 </returns>
            public static string[] AddWaterMark(string imgPath, string sImgPath)
            { 
                string[] resMsg = new[] {  "成功", sImgPath };
                using (Image image = Image.FromFile(imgPath))
                { 
                    try
                    { 
                        Bitmap bitmap = new Bitmap(image);
    
                        int width = bitmap.Width, height = bitmap.Height;
    					//水印文字
                        string text = "版权保密";
    					
                        Graphics g = Graphics.FromImage(bitmap);
    
                        g.DrawImage(bitmap, 0, 0);
    
                        g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
    
                        g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
    
                        g.DrawImage(image, new Rectangle(0, 0, width, height), 0, 0, width, height, GraphicsUnit.Pixel);
    
                        Font crFont = new Font("微软雅黑", 120, FontStyle.Bold);
                        SizeF crSize = new SizeF();
                        crSize = g.MeasureString(text, crFont);
    
                        //背景位置(去掉了. 如果想用可以自己调一调 位置.)
                        //graphics.FillRectangle(new SolidBrush(Color.FromArgb(200, 255, 255, 255)), (width - crSize.Width) / 2, (height - crSize.Height) / 2, crSize.Width, crSize.Height);
    
                        SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(120, 177, 171, 171));
                        
                        //将原点移动 到图片中点
                        g.TranslateTransform(width/ 2, height / 2);
    					//以原点为中心 转 -45度
                        g.RotateTransform(-45);
    
                        g.DrawString(text, crFont, semiTransBrush, new PointF(0, 0));
    
                        //保存文件
                        bitmap.Save(sImgPath, System.Drawing.Imaging.ImageFormat.Jpeg);
    
                    }
                    catch (Exception e)
                    { 
    
                        resMsg[0] = "失败";
                        resMsg[1] = e.Message;
                    }
                }
    
                return resMsg;
            }
    
        }
    }

![这里写图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1d1TGV4_size_16_color_FFFFFF_t_70]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1d1TGV4_size_16_color_FFFFFF_t_70]: /images/20210626/b3a9b04d691f4a4faad2b0a05c898f4d.png