图像处理

最新推荐文章于 2025-08-23 18:20:37 发布

albert528108

最新推荐文章于 2025-08-23 18:20:37 发布

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CC 4.0 BY-SA版权

文章标签：图像处理 string image path 服务器 function

本文链接：https://blog.youkuaiyun.com/albert528108/article/details/4560504

生成缩略图

SmallPicUrl = "s_" + BigPicUrl; //生成缩略图 try { PublicFunction.MakeThumbnail(Server.MapPath("../Uploadfile/image/coupon/" + BigPicUrl), Server.MapPath("../Uploadfile/image/coupon/" + SmallPicUrl), 450, 450, "HW"); } catch { SmallPicUrl = ""; }

/// <summary> /// 生成缩略图 /// </summary> /// <param name="originalImagePath">源图路径（物理路径）</param> /// <param name="thumbnailPath">缩略图路径（物理路径）</param> /// <param name="width">缩略图宽度</param> /// <param name="height">缩略图高度</param> /// <param name="mode">生成缩略图的方式</param> public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode) { System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath); int towidth = width; int toheight = height; int x = 0; int y = 0; int ow = originalImage.Width; int oh = originalImage.Height; switch (mode) { case "HW"://指定高宽缩放（可能变形） break; case "W"://指定宽，高按比例 toheight = originalImage.Height * width / originalImage.Width; break; case "H"://指定高，宽按比例 towidth = originalImage.Width * height / originalImage.Height; break; case "Cut"://指定高宽裁减（不变形） if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight) { oh = originalImage.Height; ow = originalImage.Height * towidth / toheight; y = 0; x = (originalImage.Width - ow) / 2; } else { ow = originalImage.Width; oh = originalImage.Width * height / towidth; x = 0; y = (originalImage.Height - oh) / 2; } break; default: break; } //新建一个bmp图片 System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight); //新建一个画板 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap); //设置高质量插值法 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量,低速度呈现平滑程度 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //清空画布并以透明背景色填充 g.Clear(System.Drawing.Color.Transparent); //在指定位置并且按指定大小绘制原图片的指定部分 g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight), new System.Drawing.Rectangle(x, y, ow, oh), System.Drawing.GraphicsUnit.Pixel); try { //以jpg格式保存缩略图 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); } catch (System.Exception e) { throw e; } finally { originalImage.Dispose(); bitmap.Dispose(); g.Dispose(); } }

增加水印

string webFilePath_s = Server.MapPath("Uploadfile/image/coupon/" + dr["SmallPicUrl"].ToString());　　// 服务器端缩略图路径 string webFilePath_sy = Server.MapPath("Uploadfile/image/coupon/text_" + dr["SmallPicUrl"].ToString());　// 服务器端带水印图路径(文字) try { PublicFunction.AddWater(webFilePath_s, webFilePath_sy, "编号：" + temp, "Verdana", 14); } catch { } this.labPic.Text = "<img src="Uploadfile/image/coupon/text_" + dr["SmallPicUrl"].ToString() + "" mce_src="Uploadfile/image/coupon/text_" + dr["SmallPicUrl"].ToString() + "" width='450' height='450' />";

/// <summary> /// 在图片上增加文字水印 /// </summary> /// <param name="Path">原服务器图片路径</param> /// <param name="Path_sy">生成的带文字水印的图片路径</param> /// <param name="addText">要加的文字</param> /// <param name="FontStyle">字体样式</param> /// <param name="FontSize">字号大小</param> public static void AddWater(string Path, string Path_sy, string addText, string FontFamily, float FontSize) { System.Drawing.Image image = System.Drawing.Image.FromFile(Path); System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image); g.DrawImage(image, 0, 0, image.Width, image.Height); System.Drawing.Font f = new System.Drawing.Font(FontFamily, FontSize); System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Green); g.DrawString(addText, f, b, 6, 8); g.Dispose(); image.Save(Path_sy); image.Dispose(); }

设置图片显示大小

labPic.Text = "<img src="Uploadfile/image/customer/" + dr["Picurl"].ToString() + "" mce_src="Uploadfile/image/customer/" + dr["Picurl"].ToString() + "" onload=/"setImgSize(this,600,600);/" alt='" + dr["Title"].ToString() + "' />";

<mce:script type="text/JavaScript"></mce:script>