using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Drawing.Imaging;

using System.IO;

public partial class Media_ImageCut : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void Button1_Click(object sender, EventArgs e)

{

string FilePath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + @"\0.gif";

string SavePath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + @"/temp/1.gif";

int width = 100;

int height = 100;

ImageCut(FilePath,SavePath,width,height);

}

protected void ImageCut(string Path,string SavePath,int width,int height)

{

string imgPath = Path;//原图路径

System.Drawing.Image img = System.Drawing.Image.FromFile(imgPath);//获取原图

if (img.Width > width && img.Height > height)//不够width*height的不进行缩放

{

System.Drawing.Image img1 = new Bitmap(width, height);//获取新图的第一帧

Image img1_1 = new Bitmap(width, height);//新图的其他帧

Graphics GDI_1 = Graphics.FromImage(img1);//新图的第一帧GDI

Graphics GDI1_1 = Graphics.FromImage(img1_1);//新图的其他帧GDI

//绘制新图的第一帧

GDI_1.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceCopy;//呈现颜色时,覆盖其背景色

GDI_1.InterpolationMode = InterpolationMode.HighQualityBicubic;//质量最高的转换图像

GDI_1.PixelOffsetMode = PixelOffsetMode.HighQuality;//高质量、低速度呈现

GDI_1.SmoothingMode = SmoothingMode.HighQuality;//抗锯齿

GDI_1.Clear(Color.FromKnownColor(KnownColor.Transparent));//系统默认背景填充

//绘制新图其他帧的图像

GDI_1.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceCopy;//呈现颜色时,覆盖其背景色

GDI_1.InterpolationMode = InterpolationMode.HighQualityBicubic;//质量最高的转换图像

GDI_1.PixelOffsetMode = PixelOffsetMode.HighQuality;//高质量、低速度呈现

GDI_1.SmoothingMode = SmoothingMode.HighQuality;//抗锯齿

GDI_1.Clear(Color.FromKnownColor(KnownColor.Transparent));//系统默认背景填充

foreach (Guid guid in img.FrameDimensionsList)//遍历维数

{

FrameDimension f = FrameDimension.Time;//时间维度

int count = img.GetFrameCount(f);//根据时间维度获取总帧数

Encoder encode = Encoder.SaveFlag;//保存标志参数类别

EncoderParameters ep = null;//参数

ImageCodecInfo ici = null;//编码解码器

ImageCodecInfo[] icis = ImageCodecInfo.GetImageDecoders();//解码器集合

//获取gif的解码器

foreach (ImageCodecInfo ici1 in icis)

{

if (ici1.FormatID == ImageFormat.Gif.Guid)

{

ici = ici1;

break;

}

}

//遍历每一帧

for (int z = 0; z < count; z++)

{

img.SelectActiveFrame(f, z);

//第一帧

if (z == 0)

{

//将原图的第一帧画给新图的第一帧

GDI_1.DrawImage(img, new Rectangle(0, 0, width, height), new Rectangle(0, 0, img.Width, img.Height), GraphicsUnit.Pixel);

for (int i = 0; i < img.PropertyItems.Length; i++)//获取原图的所有属性赋给新图

{

img1.SetPropertyItem(img.PropertyItems[i]);

}

ep = new EncoderParameters(1);

ep.Param[0] = new EncoderParameter(encode, (long)EncoderValue.MultiFrame);//指定对象的帧数多于1帧

img1.Save(SavePath, ici, ep);//将第一帧保存到新图

}

else

{

GDI1_1.DrawImage(img, new Rectangle(0, 0, width, height), new Rectangle(0, 0, img.Width, img.Height), GraphicsUnit.Pixel);

for (int i = 0; i < img.PropertyItems.Length; i++)

{

img1_1.SetPropertyItem(img.PropertyItems[i]);

}

ep = new EncoderParameters(1);

ep.Param[0] = new EncoderParameter(encode, (long)EncoderValue.FrameDimensionTime);

img1.SaveAdd(img1_1, ep);

}

}

ep = new EncoderParameters(1);

ep.Param[0] = new EncoderParameter(encode, (long)EncoderValue.Flush);//关闭多帧文件流

img1.SaveAdd(ep);

img.Dispose();

img1.Dispose();

img1_1.Dispose();

GDI_1.Dispose();

GDI1_1.Dispose();

}

}

}

}