1 /// <summary>
2 /// 会产生graphics异常的PixelFormat
3 /// </summary>
4 private static PixelFormat[] indexedPixelFormats = { PixelFormat.Undefined, PixelFormat.DontCare,
5 PixelFormat.Format16bppArgb1555, PixelFormat.Format1bppIndexed, PixelFormat.Format4bppIndexed,
6 PixelFormat.Format8bppIndexed
7 };
8
9
10 /// <summary>
11 /// 判断图片的PixelFormat 是否在 引发异常的 PixelFormat 之中
12 /// </summary>
13 /// <param name="imgPixelFormat">原图片的PixelFormat</param>
14 /// <returns></returns>
15 private static bool IsPixelFormatIndexed(PixelFormat imgPixelFormat)
16 {
17 foreach (PixelFormat pf in indexedPixelFormats)
18 {
19 if (pf.Equals(imgPixelFormat)) return true;
20 }
21
22 return false;
23 }
24
25 /// <summary>
26 /// 在图片上生成图片水印
27 /// </summary>
28 /// <param name="Path">原服务器图片路径</param>
29 /// <param name="Path_syp">生成的带图片水印的图片路径</param>
30 /// <param name="Path_sypf">水印图片路径</param>
31 public static void AddShuiYinPic(string Path, string Path_syp, string Path_sypf)
32 {
33 System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
34 System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);
35 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
36 g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);
37 g.Dispose();
38
39 image.Save(Path_syp);
40 image.Dispose();
41 }
42 /// <summary>
43 /// 在图片上增加文字水印
44 /// </summary>
45 /// <param name="Path">原服务器图片路径</param>
46 /// <param name="Path_sy">生成的带文字水印的图片路径</param>
47 public static void AddShuiYinWord(string Path, string Path_sy)
48 {
49
50
51 using (System.Drawing.Image img = System.Drawing.Image.FromFile(Path))
52 {
53 //如果原图片是索引像素格式之列的，则需要转换
54 if (IsPixelFormatIndexed(img.PixelFormat))
55 {
56 Bitmap bmp = new Bitmap(img.Width, img.Height, PixelFormat.Format32bppArgb);
57 using (Graphics g = Graphics.FromImage(bmp))
58 {
59 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
60 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
61 g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
62 g.DrawImage(img, 0, 0);
63
64 System.Drawing.Font f = new System.Drawing.Font("Verdana", 16);
65 System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Red);
66 g.DrawString("爱智旮旯", f, b, 15, 15);
67
68
69 }
70 bmp.Save(Path_sy);
71 bmp.Dispose();
72
73 }
74 else //否则直接操作
75 {
76 string addText = "爱智旮旯";
77 System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
78 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
79 g.DrawImage(image, 0, 0, image.Width, image.Height);
80 System.Drawing.Font f = new System.Drawing.Font("Verdana", 16);
81 System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Blue);
82
83 g.DrawString(addText, f, b, 15, 15);
84 g.Dispose();
85
86 image.Save(Path_sy);
87 image.Dispose();
88 }
89 }
90
91
92
93
94
95
96
97 }
98
99 /// <summary>
100 /// 生成缩略图
101 /// </summary>
102 /// <param name="originalImagePath">源图路径（物理路径）</param>
103 /// <param name="thumbnailPath">缩略图路径（物理路径）</param>
104 /// <param name="width">缩略图宽度</param>
105 /// <param name="height">缩略图高度</param>
106 /// <param name="mode">生成缩略图的方式</param>
107 public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
108 {
109 System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
110
111 int towidth = width;
112 int toheight = height;
113
114 int x = 0;
115 int y = 0;
116 int ow = originalImage.Width;
117 int oh = originalImage.Height;
118
119 switch (mode)
120 {
121 case "HW"://指定高宽缩放（可能变形）
122 break;
123 case "W"://指定宽，高按比例
124 toheight = originalImage.Height * width / originalImage.Width;
125 break;
126 case "H"://指定高，宽按比例
127 towidth = originalImage.Width * height / originalImage.Height;
128 break;
129 case "Cut"://指定高宽裁减（不变形）
130 if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
131 {
132 oh = originalImage.Height;
133 ow = originalImage.Height * towidth / toheight;
134 y = 0;
135 x = (originalImage.Width - ow) / 2;
136 }
137 else
138 {
139 ow = originalImage.Width;
140 oh = originalImage.Width * height / towidth;
141 x = 0;
142 y = (originalImage.Height - oh) / 2;
143 }
144 break;
145 default:
146 break;
147 }
148
149 //新建一个bmp图片
150 System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
151
152 //新建一个画板
153 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
154
155 //设置高质量插值法
156 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
157
158 //设置高质量,低速度呈现平滑程度
159 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
160
161 //清空画布并以透明背景色填充
162 g.Clear(System.Drawing.Color.Transparent);
163
164 //在指定位置并且按指定大小绘制原图片的指定部分
165 g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),
166 new System.Drawing.Rectangle(x, y, ow, oh),
167 System.Drawing.GraphicsUnit.Pixel);
168
169 try
170 {
171 //以jpg格式保存缩略图
172 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
173 }
174 catch (System.Exception e)
175 {
176 throw e;
177 }
178 finally
179 {
180 originalImage.Dispose();
181 bitmap.Dispose();
182 g.Dispose();
183 }
184 }
185
186 protected void Button1_Click(object sender, EventArgs e)
187 {
188 if (FileUpload1.HasFile)
189 {
190 string fileContentType = FileUpload1.PostedFile.ContentType;
191 if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg" || fileContentType == "image/jpg")
192 {
193 string name = FileUpload1.PostedFile.FileName; // 客户端文件路径
194
195 FileInfo file = new FileInfo(name);
196 string fileName = file.Name; // 文件名称
197 string fileName_s = "s_" + file.Name; // 缩略图文件名称
198 string fileName_sy = "sy_" + file.Name; // 水印图文件名称（文字）
199 string fileName_syp = "syp_" + file.Name; // 水印图文件名称（图片）
200 //以下路径可以根据情况进行修改
201 string webFilePath = Server.MapPath("file/" + fileName); // 服务器端文件路径
202 string webFilePath_s = Server.MapPath("file/" + fileName_s); // 服务器端缩略图路径
203 string webFilePath_sy = Server.MapPath("file/" + fileName_sy); // 服务器端带水印图路径(文字)
204 string webFilePath_syp = Server.MapPath("file/" + fileName_syp); // 服务器端带水印图路径(图片)
205 //以下为水印图片的路径一定要先准备一张水印图片！
206 string webFilePath_sypf = Server.MapPath("file/shuiyin.jpg"); // 服务器端水印图路径(图片)
207
208 if (!File.Exists(webFilePath))
209 {
210 try
211 {
212 FileUpload1.SaveAs(webFilePath); // 使用 SaveAs 方法保存文件
213 AddShuiYinWord(webFilePath, webFilePath_sy);
214 //AddShuiYinPic(webFilePath, webFilePath_syp, webFilePath_sypf);
215 MakeThumbnail(webFilePath, webFilePath_s, 130, 130, "Cut"); // 生成缩略图方法
216 Label1.Text = "提示：文件“" + fileName + "”成功上传，并生成“" + fileName_s + "”缩略图，文件类型为：" + FileUpload1.PostedFile.ContentType + "，文件大小为：" + FileUpload1.PostedFile.ContentLength + "B";
217 }
218 catch (Exception ex)
219 {
220 Label1.Text = "提示：文件上传失败，失败原因：" + ex.Message;
221 }
222 }
223 else
224 {
225 Label1.Text = "提示：文件已经存在，请重命名后上传";
226 }
227 }
228 else
229 {
230 Label1.Text = "提示：文件类型不符";
231 }
232
233 }
234 }
asp.net生成缩略图、文字图片水印
时间： 2024-08-13 05:18:20