.NET中Gif图像的分解和合成
阅读:2741
添加日期:2021/3/22 16:07:19
"
一个Gif图像文件,是有几个文件进行合成的,因此处理此类文件的时候,不能像Jpeg或者Bmp文件那样处理。需要把Gif文件拆分帧的形式,然后对每一帧进行处理,处理完后再合成Gif。
其实网上有个例子对于Gif处理非常详细,地址如下。powered by 25175.net
http://www.codeproject.com/dotnet/NGif.asp
1: /* create Gif */
2: //you should replace filepath
3: String [] imageFilePaths = new String[]{"c:\\01.png","c:\\02.png","c:\\03.png"};
4: String outputFilePath = "c:\\test.gif";
5: AnimatedGifEncoder e = new AnimatedGifEncoder();
6: e.Start( outputFilePath );
7: e.SetDelay(500);
8: //-1:no repeat,0:always repeat
9: e.SetRepeat(0);
10: for (int i = 0, count = imageFilePaths.Length; i < count; i++ )
11: {
12: e.AddFrame( Image.FromFile( imageFilePaths[i] ) );
13: }
14: e.Finish();
15: /* extract Gif */
16: string outputPath = "c:\\";
17: GifDecoder gifDecoder = new GifDecoder();
18: gifDecoder.Read( "c:\\test.gif" );
19: for ( int i = 0, count = gifDecoder.GetFrameCount(); i < count; i++ )
20: {
21: Image frame = gifDecoder.GetFrame( i ); // frame i
22: frame.Save( outputPath + Guid.NewGuid().ToString()
23: + ".png", ImageFormat.Png );
24: }
但是对于一个Gif进行拆分,其实Image对象本身就支持,例如对于一个Gif文件拆分成Jpeg文件方式,可以按照如下的方式进行处理。
1: using System.Drawing.Drawing2D;
2:
3: using System.Drawing.Imaging;
4:
5: Image imgGif = Image.FromFile(@"d:\test.gif");
6:
7: //Create a new FrameDimension object from this image
8:
9: FrameDimension ImgFrmDim = new FrameDimension( imgGif.FrameDimensionsList[0] );
10:
11: //Determine the number of frames in the image
12:
13: //Note that all images contain at least 1 frame,
14:
15: //but an animated GIF will contain more than 1 frame.
16:
17: int nFrameCount = imgGif.GetFrameCount( ImgFrmDim );
18:
19: // Save every frame into jpeg format
20:
21: for( int i = 0; i < nFrameCount; i++ )
22:
23: {
24:
25: imgGif.SelectActiveFrame( ImgFrmDim, i );
26:
27: imgGif.Save( string.Format( @"d:\Frame{0}.jpg", i ), ImageFormat.Jpeg );
28:
29: }
