C#生成清晰缩略图【ASP.NET】
Winform、ASP.NET中如何生成清晰缩略图，代码分享public void imgsize()
{
//本例中假定了两个变量：
String src = "c:/myImages/a.jpg"; //源图像文件的绝对路径
String dest = "c:/myImages/a_th.jpg"; //生成的缩略图图像文件的绝对路径
int thumbWidth = 132; //要生成的缩略图的宽度
int thumbHeight = 100; //要生成的缩略图的高度
System.Drawing.Image image = System.Drawing.Image.FromFile(src); //利用Image对象装载源图像
//接着创建一个System.Drawing.Bitmap对象，并设置你希望的缩略图的宽度和高度。
int srcWidth = image.Width;
int srcHeight = image.Height;
Bitmap bmp = new Bitmap(thumbWidth, thumbHeight);
//从Bitmap创建一个System.Drawing.Graphics对象，用来绘制高质量的缩小图。
System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bmp);
//设置 System.Drawing.Graphics对象的SmoothingMode属性为HighQuality
gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//下面这个也设成高质量
gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
//下面这个设成High
gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//把原始图像绘制成上面所设置宽高的缩小图
System.Drawing.Rectangle rectDestination = new System.Drawing.Rectangle(0, 0, thumbWidth, thumbHeight);
gr.DrawImage(image, rectDestination, 0, 0, srcWidth, srcHeight, GraphicsUnit.Pixel);
//保存图像，大功告成！
bmp.Save(dest);
//最后别忘了释放资源
bmp.Dispose();
image.Dispose();
}
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