C# 生成缩略图
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2022-04-08 20:28:22
个人觉得比较好用的缩略图方法,用在每次从FTP服务端下载图片,之后引用该方法进行压缩图片; 转载自:http://www.wxzzz.com/1413.html ......
个人觉得比较好用的缩略图方法,用在每次从ftp服务端下载图片,之后引用该方法进行压缩图片;
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="localimagepath">图片地址</param>
/// <param name="thumbnailimagepath">缩略图地址</param>
/// <param name="width">图片宽度</param>
/// <param name="height">图片高度</param>
/// <param name="p"></param>
public static void getthumbnail(string localimagepath, string thumbnailimagepath, int width, int height)
{
system.drawing.image serverimage = system.drawing.image.fromfile(localimagepath);
//画板大小
int towidth = width;
int toheight = height;
//缩略图矩形框的像素点
int x = 0;
int y = 0;
int ow = serverimage.width;
int oh = serverimage.height;
if (ow > oh)
{
toheight = serverimage.height * width / serverimage.width;
}
else
{
towidth = serverimage.width * height / serverimage.height;
}
//新建一个bmp图片
system.drawing.image bm = new system.drawing.bitmap(width, height);
//新建一个画板
system.drawing.graphics g = system.drawing.graphics.fromimage(bm);
//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.white);
//在指定位置并且按指定大小绘制原图片的指定部分
g.drawimage(serverimage, new system.drawing.rectangle((width - towidth) / 2, (height - toheight) / 2, towidth, toheight),
0, 0, ow, oh,
system.drawing.graphicsunit.pixel);
try
{
//以jpg格式保存缩略图
bm.save(thumbnailimagepath, system.drawing.imaging.imageformat.jpeg);
}
catch (system.exception e)
{
throw e;
}
finally
{
serverimage.dispose();
bm.dispose();
g.dispose();
}
}
转载自:http://www.wxzzz.com/1413.html
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