各式各样的图片缩略水印静态类
今天想学习一下图像变形的技巧,无意间在网上看到这个代码,觉得不错,转发一下:
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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Drawing.Imaging;
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namespace Steam.Core
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{
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public static class ImageDeal
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{
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/**//// <summary>
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/// 缩略图,按高度和宽度来缩略
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///http://www.cnblogs.com/pooeo/
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/// </summary>
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/// <param name="image"></param>
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/// <param name="size"></param>
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/// <returns></returns>
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public static Image Scale(Image image, Size size)
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{
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return image.GetThumbnailImage(size.Width, size.Height, null, new IntPtr());
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}
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/**//// <summary>
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/// 缩略图,按倍数来缩略
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///http://www.cnblogs.com/pooeo/
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/// </summary>
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/// <param name="image">原图</param>
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/// <param name="multiple">放大或缩小的倍数,负数表示缩小,正数表示放大</param>
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/// <returns></returns>
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public static Image Scale(Image image, Int32 multiple)
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{
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Int32 newWidth;
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Int32 newHeight;
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Int32 absMultiple = Math.Abs(multiple);
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if (multiple == 0)
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{
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return image.Clone() as Image;
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}
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if (multiple < 0)
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{
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newWidth = image.Width / absMultiple;
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newHeight = image.Height / absMultiple;
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}
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else
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{
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newWidth = image.Width * absMultiple;
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newHeight = image.Height * absMultiple;
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}
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return image.GetThumbnailImage(newWidth, newHeight, null, new IntPtr());
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}
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/**//// <summary>
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/// 固定宽度缩略
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///http://www.cnblogs.com/pooeo/
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/// </summary>
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/// <param name="image"></param>
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/// <param name="width"></param>
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/// <returns></returns>
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public static Image ScaleFixWidth(Image image, Int32 width)
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{
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Int32 newWidth = width;
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Int32 newHeight;
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Double tempMultiple = (Double)newWidth / (Double)image.Width;
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newHeight = (Int32)(((Double)image.Height) * tempMultiple);
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Image newImage = new Bitmap(newWidth, newHeight);
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using (Graphics newGp = Graphics.FromImage(newImage))
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{
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newGp.CompositingQuality = CompositingQuality.HighQuality;
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//设置高质量插值法
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newGp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
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//设置高质量,低速度呈现平滑程度
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newGp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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//清空画布并以透明背景色填充
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newGp.Clear(Color.Transparent);
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newGp.DrawImage(image, new Rectangle(0, 0, newWidth, newHeight));
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}
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return newImage;
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}
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/**//// <summary>
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/// 固定高度缩略
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///http://www.cnblogs.com/pooeo/
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/// </summary>
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/// <param name="image"></param>
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/// <param name="height"></param>
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/// <returns></returns>
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public static Image ScaleFixHeight(Image image, Int32 height)
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{
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Int32 newWidth;
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Int32 newHeight = height;
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Double tempMultiple = (Double)newHeight / (Double)image.Height;
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newWidth = (Int32)(((Double)image.Width) * tempMultiple);
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Image newImage = new Bitmap(newWidth, newHeight);
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using (Graphics newGp = Graphics.FromImage(newImage))
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{
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newGp.CompositingQuality = CompositingQuality.HighQuality;
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//设置高质量插值法
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newGp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
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//设置高质量,低速度呈现平滑程度
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newGp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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//清空画布并以透明背景色填充
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newGp.Clear(Color.Transparent);
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newGp.DrawImage(image, new Rectangle(0, 0, newWidth, newHeight));
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}
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return newImage;
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}
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/**//// <summary>
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/// 裁减缩略,根据固定的高度和宽度
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///http://www.cnblogs.com/pooeo/
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/// </summary>
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/// <param name="image"></param>
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/// <param name="width"></param>
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/// <param name="heigth"></param>
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/// <returns></returns>
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public static Image ScaleCut(Image image, Int32 width, Int32 height)
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{
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int x = 0;
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int y = 0;
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int ow = image.Width;
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int oh = image.Height;
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if (width >= ow && height >= oh)
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{
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return image;
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}
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//如果结果要比原来的宽
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if (width > ow)
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{
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width = ow;
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}
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if (height > oh)
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{
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height = oh;
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}
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if ((double)image.Width / (double)image.Height > (double)width / (double)height)
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{
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oh = image.Height;
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ow = image.Height * width / height;
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y = 0;
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x = (image.Width - ow) / 2;
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}
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else
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{
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ow = image.Width;
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oh = image.Width * height / width;
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x = 0;
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y = (image.Height - oh) / 2;
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}
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Image newImage = new Bitmap(width, height);
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using (Graphics newGp = Graphics.FromImage(newImage))
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{
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newGp.CompositingQuality = CompositingQuality.HighQuality;
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//设置高质量插值法
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newGp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
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//设置高质量,低速度呈现平滑程度
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newGp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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//清空画布并以透明背景色填充
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newGp.Clear(Color.Transparent);
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newGp.DrawImage(image, new Rectangle(0, 0, width, height),
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new Rectangle(x, y, ow, oh),
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GraphicsUnit.Pixel);
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}
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return newImage;
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}
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/**//// <summary>
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/// 生成缩略图
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///http://www.cnblogs.com/pooeo/
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/// </summary>
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/// <param name="originalImagePath">源图路径(物理路径)</param>
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/// <param name="thumbnailPath">缩略图路径(物理路径)</param>
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/// <param name="width">缩略图宽度</param>
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/// <param name="height">缩略图高度</param>
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/// <param name="mode">生成缩略图的方式</param>
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public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
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{
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Image originalImage = Image.FromFile(originalImagePath);
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int towidth = width;
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int toheight = height;
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int x = 0;
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int y = 0;
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int ow = originalImage.Width;
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int oh = originalImage.Height;
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switch (mode)
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{
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case "HW"://指定高宽缩放(可能变形)
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break;
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case "W"://指定宽,高按比例
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toheight = originalImage.Height * width / originalImage.Width;
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break;
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case "H"://指定高,宽按比例
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towidth = originalImage.Width * height / originalImage.Height;
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break;
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case "Cut"://指定高宽裁减(不变形)
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if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
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{
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oh = originalImage.Height;
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ow = originalImage.Height * towidth / toheight;
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y = 0;
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x = (originalImage.Width - ow) / 2;
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}
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else
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{
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ow = originalImage.Width;
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oh = originalImage.Width * height / towidth;
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x = 0;
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y = (originalImage.Height - oh) / 2;
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}
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break;
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default:
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break;
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}
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//新建一个bmp图片
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Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
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//新建一个画板
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Graphics g = System.Drawing.Graphics.FromImage(bitmap);
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//设置高质量插值法
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g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
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//设置高质量,低速度呈现平滑程度
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g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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//清空画布并以透明背景色填充
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g.Clear(Color.Transparent);
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//在指定位置并且按指定大小绘制原图片的指定部分
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g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
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new Rectangle(x, y, ow, oh),
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GraphicsUnit.Pixel);
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try
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{
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//以jpg格式保存缩略图
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bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
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}
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catch (System.Exception e)
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{
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throw e;
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}
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finally
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{
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originalImage.Dispose();
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bitmap.Dispose();
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g.Dispose();
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}
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}
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/**//// <summary>
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/// 打水印,在某一点
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///http://www.cnblogs.com/pooeo/
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/// </summary>
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/// <param name="image"></param>
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/// <param name="waterImagePath"></param>
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/// <param name="p"></param>
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public static void Makewater(Image image, String waterImagePath, Point p)
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{
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ImageDeal.Makewater(image, waterImagePath, p, ImagePosition.TopLeft);
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}
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public static void Makewater(Image image, String waterImagePath, Point p, ImagePosition imagePosition)
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{
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using (Image warterImage = Image.FromFile(waterImagePath))
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{
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using (Graphics newGp = Graphics.FromImage(image))
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{
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newGp.CompositingQuality = CompositingQuality.HighQuality;
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//设置高质量插值法
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newGp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
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//设置高质量,低速度呈现平滑程度
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newGp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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switch (imagePosition)
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{
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case ImagePosition.BottomLeft:
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p.Y = image.Height - warterImage.Height - p.Y;
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break;
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case ImagePosition.TopRigth:
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p.X = image.Width - warterImage.Width - p.X;
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break;
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case ImagePosition.BottomRight:
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p.Y = image.Height - warterImage.Height - p.Y;
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p.X = image.Width - warterImage.Width - p.X;
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break;
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}
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newGp.DrawImage(warterImage, new Rectangle(p, new Size(warterImage.Width, warterImage.Height)));
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}
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}
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}
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public static void Makewater(Image image, String waterStr, Font font, Brush brush, Point p)
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{
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ImageDeal.Makewater(image, waterStr, font, brush, p, ImagePosition.TopLeft);
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}
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public static void Makewater(Image image, String waterStr, Font font, Brush brush, Point p, ImagePosition imagePosition)
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{
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using (Graphics newGp = Graphics.FromImage(image))
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{
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Int32 stringWidth;
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Int32 stringHeight;
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stringHeight = (int)font.Size;
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stringWidth = (int)(((float)StringDeal.GetBitLength(waterStr) / (float)2) * (font.Size + 1));
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newGp.CompositingQuality = CompositingQuality.HighQuality;
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//设置高质量插值法
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newGp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
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//设置高质量,低速度呈现平滑程度
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newGp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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//文字抗锯齿
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newGp.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
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switch (imagePosition)
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{
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case ImagePosition.BottomLeft:
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p.Y = image.Height - stringHeight - p.Y;
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break;
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case ImagePosition.TopRigth:
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p.X = image.Width - stringWidth - p.X;
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break;
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case ImagePosition.BottomRight:
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p.Y = image.Height - stringHeight - p.Y;
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p.X = image.Width - stringWidth - p.X;
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break;
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}
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newGp.DrawString(waterStr, font, brush, p);
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}
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}
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/**//// <summary>
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/// 高质量保存
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///http://www.cnblogs.com/pooeo/
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/// </summary>
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/// <param name="image"></param>
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/// <param name="path"></param>
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public static void SaveQuality(Image image, String path)
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{
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ImageCodecInfo myImageCodecInfo;
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Encoder myEncoder;
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EncoderParameter myEncoderParameter;
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EncoderParameters myEncoderParameters;
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myImageCodecInfo = ImageCodecInfo.GetImageEncoders()[0];
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myEncoder = Encoder.Quality;
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myEncoderParameters = new EncoderParameters(1);
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myEncoderParameter = new EncoderParameter(myEncoder, 100L); // 0-100
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myEncoderParameters.Param[0] = myEncoderParameter;
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try
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{
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image.Save(path, myImageCodecInfo, myEncoderParameters);
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}
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finally
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{
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myEncoderParameter.Dispose();
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myEncoderParameters.Dispose();
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}
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}
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}
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public enum StringPosition
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{
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TopLeft,
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BottomLeft
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}
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public enum ImagePosition
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{
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TopLeft,
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BottomLeft,
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BottomRight,
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TopRigth
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}
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}
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309
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310
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311
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312
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313
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314
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315
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316
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317
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318
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319
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320
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321
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322
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323
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324
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325
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326
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327
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328
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329
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330
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331
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332
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333
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334
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335
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336
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337
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338
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339
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340
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341
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342
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343
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344
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345
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346
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347
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348
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349
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350
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351
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