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Posted 1 Sep 2005
Licenced CPOL

NGif, Animated GIF Encoder for .NET

, 1 Sep 2005
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Create animated GIF images using C#.

Sample Image - NGif.gif


Because .NET Framework can't create animated GIF images, NGif provides a way to create GIF animations in the .NET framework. It can create an animated GIF from several images and extract images from an animated GIF.

Using the code

/* create Gif */
//you should replace filepath
String [] imageFilePaths = new String[]{"c:\\01.png","c:\\02.png","c:\\03.png"}; 
String outputFilePath = "c:\\test.gif";
AnimatedGifEncoder e = new AnimatedGifEncoder();
e.Start( outputFilePath );
//-1:no repeat,0:always repeat
for (int i = 0, count = imageFilePaths.Length; i < count; i++ ) 
 e.AddFrame( Image.FromFile( imageFilePaths[i] ) );
/* extract Gif */
string outputPath = "c:\\";
GifDecoder gifDecoder = new GifDecoder();
gifDecoder.Read( "c:\\test.gif" );
for ( int i = 0, count = gifDecoder.GetFrameCount(); i < count; i++ ) 
 Image frame = gifDecoder.GetFrame( i ); // frame i
 frame.Save( outputPath + Guid.NewGuid().ToString() 
                       + ".png", ImageFormat.Png );

Points of Interest

Use Stream to replace BinaryWriter when you write a fixed-byte structured binary file.


  • 31 Aug 2005: Draft.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

China China
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Comments and Discussions

QuestionGifDecoder.cs exceptions Pin
Divya Muppa29-Sep-10 10:16
memberDivya Muppa29-Sep-10 10:16 
GeneralTransparency Pin
gameguy2716-Aug-10 6:39
membergameguy2716-Aug-10 6:39 
GeneralBug involving the first frame Pin
Dataflashsabot23-Jan-10 2:56
memberDataflashsabot23-Jan-10 2:56 
GeneralI've released a derived work Pin
sbridewell24-Oct-09 10:44
membersbridewell24-Oct-09 10:44 
GeneralRe: I've released a derived work Pin
jambonbill3-Nov-09 15:39
memberjambonbill3-Nov-09 15:39 
General"The process cannot access the file xpto because it is being used by another process". Pin
frantic029-Sep-09 23:52
professionalfrantic029-Sep-09 23:52 
GeneralRe: "The process cannot access the file xpto because it is being used by another process". Pin
Rassler481-Mar-13 1:16
memberRassler481-Mar-13 1:16 
QuestionCan I release a derived work please? Pin
sbridewell4-Sep-09 9:12
membersbridewell4-Sep-09 9:12 
Hi gOODiDEA.NET, great work.

I've created a derived work based on Phil@ThinkEdge's amended version of this library. The main changes I've made are adding support for a single global colour table (as opposed to a local colour table for each frame) to the encoder, making use of generics in .net 2.0, and factoring out many of the building blocks of GIF files into their own separate classes with most of their attributes exposed as public properties.

I've also written two small applications which make use of this derived work, and I'd like to publish/release the lot under a free software license (ideally the GNU GPL if that's compatible with the CPOL). Would that be OK with you?

AnswerRe: Can I release a derived work please? Pin
jambonbill6-Oct-09 3:04
memberjambonbill6-Oct-09 3:04 
GeneralRe: Can I release a derived work please? Pin
sbridewell6-Oct-09 10:54
membersbridewell6-Oct-09 10:54 
GeneralRe: Can I release a derived work please? Pin
jambonbill6-Oct-09 14:50
memberjambonbill6-Oct-09 14:50 
GeneralRe: Can I release a derived work please? [modified] Pin
sbridewell7-Oct-09 9:10
membersbridewell7-Oct-09 9:10 
GeneralResize an animated gif background transparency Pin
vuivuivui26-Aug-09 21:23
membervuivuivui26-Aug-09 21:23 
Questionhow to force no transparency Pin
Are Jay20-Aug-09 7:55
memberAre Jay20-Aug-09 7:55 
Generalit can't store more than 19 frames. Pin
inamgul26-Feb-09 1:00
memberinamgul26-Feb-09 1:00 
GeneralAnimated gif Timeline Properties Pin
Daffy1012-Nov-08 22:01
memberDaffy1012-Nov-08 22:01 
Generalan better implement Pin
gOODiDEA.NET13-Oct-08 14:54
membergOODiDEA.NET13-Oct-08 14:54 
GeneralRe: an better implement Pin
ecjob21-Oct-08 4:24
memberecjob21-Oct-08 4:24 
GeneralRe: an better implement Pin
Spirch2-Jan-09 14:13
memberSpirch2-Jan-09 14:13 
GeneralRe: an better implement Pin
Ceyhun25-Jul-09 6:20
memberCeyhun25-Jul-09 6:20 
GeneralRe: an better implement Pin
Nathanael Jones5-Jan-12 6:33
memberNathanael Jones5-Jan-12 6:33 
Question怎样才能把体积减少一些啊?? Pin
ecjob11-Oct-08 8:31
memberecjob11-Oct-08 8:31 
General一处bug Pin
interiv@qq.com6-Sep-08 17:05
memberinteriv@qq.com6-Sep-08 17:05 
GeneralExporting frames [modified] Pin
jambonbill17-Aug-08 20:01
memberjambonbill17-Aug-08 20:01 
GeneralPerformance improvement Pin
Member 21880517-Aug-08 0:00
memberMember 21880517-Aug-08 0:00 

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