C#改变图片大小

byte[] buffer = new byte[1];

//Byte转为Image对象

MemoryStream ms = new MemoryStream(buffer);

Image image = System.Drawing.Image.FromStream(ms);

//设置画布，绘画新图片

Bitmap b = new Bitmap(200, 200);

Graphics g = Graphics.FromImage((System.Drawing.Image)b);

g.InterpolationMode = InterpolationMode.HighQualityBicubic;

//绘制图像

g.DrawImage(image, 0, 0, 200, 200);

g.Dispose();

//保存图片

b.Save("aaaaaaaaa");