图片转换，把bmp图片转换为jpg图片

图片转换，把bmp图片转换为jpg图片，用.net的类库很简单哦。

using System.IO;
using System.Drawing.Imaging;

public class imgConvert
private void BMPToJPG(string bmpFileName,string jpgFileName)

System.Drawing.Image img;
img=ReturnPhoto(bmpFileName);

img.Save(jpgFileName,ImageFormat.Jpeg);
}

private Image ReturnPhoto(string bmpFileName)
System.IO.FileStream stream ;
stream=File.OpenRead(bmpFileName);
Bitmap bmp = new Bitmap(stream);
System.Drawing.Image image = bmp;//得到原图
//创建指定大小的图
System.Drawing.Image newImage = image.GetThumbnailImage(bmp.Width, bmp.Height, null, new IntPtr());
Graphics g=Graphics.FromImage(newImage);
g.DrawImage(newImage,0,0, newImage.Width, newImage.Height); //将原图画到指定的图上
g.Dispose();
stream.Close();
return newImage;
}
}