How to Create an Animated Gif in .Net

How to create animated gif in .NET Core

You should try using Magick.Net which is a good image manipulation library and is also available for .net core. An example of how to create a .gif can be found here.

To add Magick.Net to your .net core project you'll need to modify your project.json as follows:

"dependencies":
{
   "Magick.NET.Core-Q8": "7.0.0.0102"
}

Hope this helps!

C# - Create an animated GIF image from selected images in ASP.net

try NGif (A Component written using C#,it provide a way to create gif animations in .NET framework)

this code project article will help you - NGif, Animated GIF Encoder for .NET

Need to create an animated GIF in C#

http://midimick.com/magicknet/

http://midimick.com/magicknet/magickDoc.html

.NET - Creating a looping .gif using GifBitmapEncoder

I finally got this to work after studying this article and referencing the raw bytes of GIF files. If you want to do so yourself, you can get the bytes in hex format using PowerShell like so...

$bytes = [System.IO.File]::ReadAllBytes("C:\Users\Me\Desktop\SomeGif.gif")
[System.BitConverter]::ToString($bytes)

The GifBitmapEncoder appears to write the Header, Logical Screen Descriptor, then the Graphics Control Extension. The "NETSCAPE2.0" extension is missing. In GIFs from other sources that do loop, the missing extension always appears right before the Graphics Control Extension.

So I just plugged in the bytes after the 13th byte, since the first two sections are always this long.

        // After adding all frames to gifEncoder (the GifBitmapEncoder)...
        using (var ms = new MemoryStream())
        {
            gifEncoder.Save(ms);
            var fileBytes = ms.ToArray();
            // This is the NETSCAPE2.0 Application Extension.
            var applicationExtension = new byte[] { 33, 255, 11, 78, 69, 84, 83, 67, 65, 80, 69, 50, 46, 48, 3, 1, 0, 0, 0 };
            var newBytes = new List<byte>();
            newBytes.AddRange(fileBytes.Take(13));
            newBytes.AddRange(applicationExtension);
            newBytes.AddRange(fileBytes.Skip(13));
            File.WriteAllBytes(saveFile, newBytes.ToArray());
        }

How do I use Magick.NET to convert an animated webp image to an animated gif?

A MagickImage is only a single image. When an animated image is read this will be the first frame. If you want to read all the frames you will need to read the files with a MagickImageCollection instead.

public void TestConvertImageType() {
    using (var animatedWebP = new MagickImageColection("animated.webp")) {
        animatedWebP.Write("animated-generated.gif", MagickFormat.Gif);
    }
    using (var animatedGif = new MagickImageColection("animated.gif")) {
        animatedGif.Write("animated-generated.webp", MagickFormat.WebP);
    }
}

And you don't need to also install ImageMagick on your machine. The ImageMagick library comes with the Magick.NET library.

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