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NGif, Animated GIF Encoder for .NET

By , 1 Sep 2005
 

Sample Image - NGif.gif

Introduction

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 );
e.SetDelay(500);
//-1:no repeat,0:always repeat
e.SetRepeat(0);
for (int i = 0, count = imageFilePaths.Length; i < count; i++ ) 
{
 e.AddFrame( Image.FromFile( imageFilePaths[i] ) );
}
e.Finish();
/* 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.

History

  • 31 Aug 2005: Draft.

License

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

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GeneralTransperencymemberJeremiasK24 Feb '11 - 7:45 
Is there any way to set the transperency for each frame on its own?
 
I tried with e.SetTransperency(Color) before adding each frame but it doesnt work ;(
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GeneralRe: Transperencymemberv2leon28 Aug '11 - 22:49 
i got this problem too…… SetTransperency only works on first frame ：（
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GeneralRe: Transperencymembermaoshu22 Dec '12 - 0:14 
In AnimatedGifEncoder.cs find a method called AnalyzePixels, the usedEntry dose not been reinitialized
Change before:
protected void AnalyzePixels()
        {
            int len = pixels.Length;
            int nPix = len / 3;
            indexedPixels = new byte[nPix];
            NeuQuant nq = new NeuQuant(pixels, len, sample);
            // initialize quantizer
            colorTab = nq.Process(); // create reduced palette
            // convert map from BGR to RGB
            //			for (int i = 0; i < colorTab.Length; i += 3) 
            //			{
            //				byte temp = colorTab[i];
            //				colorTab[i] = colorTab[i + 2];
            //				colorTab[i + 2] = temp;
            //				usedEntry[i / 3] = false;
            //			}
            // map image pixels to new palette
            int k = 0;
            for (int i = 0; i < nPix; i++)
            {
                int index =
                    nq.Map(pixels[k++] & 0xff,
                    pixels[k++] & 0xff,
                    pixels[k++] & 0xff);
                usedEntry[index] = true;
                indexedPixels[i] = (byte)index;
            }
            pixels = null;
            colorDepth = 8;
            palSize = 7;
            // get closest match to transparent color if specified
            if (transparent != Color.Empty)
            {
                transIndex = FindClosest(transparent);
            }
        }
 
 
After change:
protected void AnalyzePixels()
        {
            int len = pixels.Length;
            int nPix = len / 3;
            indexedPixels = new byte[nPix];
            NeuQuant nq = new NeuQuant(pixels, len, sample);
            // initialize quantizer
            colorTab = nq.Process(); // create reduced palette
            // convert map from BGR to RGB
            //			for (int i = 0; i < colorTab.Length; i += 3) 
            //			{
            //				byte temp = colorTab[i];
            //				colorTab[i] = colorTab[i + 2];
            //				colorTab[i + 2] = temp;
            //				usedEntry[i / 3] = false;
            //			}
            // map image pixels to new palette
            int k = 0;
            usedEntry = new bool[256];//here is the fix.
            for (int i = 0; i < nPix; i++)
            {
                int index =
                    nq.Map(pixels[k++] & 0xff,
                    pixels[k++] & 0xff,
                    pixels[k++] & 0xff);
                usedEntry[index] = true;
                indexedPixels[i] = (byte)index;
            }
            pixels = null;
            colorDepth = 8;
            palSize = 7;
            // get closest match to transparent color if specified
            if (transparent != Color.Empty)
            {
                transIndex = FindClosest(transparent);
            }
        }

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About Article
Create animated GIF images using C#.
Type Article
Licence CPOL
First Posted 1 Sep 2005
Views 662,087
Bookmarked 94 times

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