HOW TO: Extract Each Frame From a GIF

static void ExtractFrames(string inputFile, string outputDir)
{
   // Ensure the output directory exists
   Directory.CreateDirectory(outputDir);

   // Load the original image
   using (var codecs = new RasterCodecs())
   {
      codecs.Options.Load.AllPages = true;
      using (var animatedImage = codecs.Load(inputFile))
      {
         // Check if the image isn't animated
         if (animatedImage.AnimationGlobalLoop < -1)
         {
            // Extract each frame/page directly
            for (int page = 1; page <= animatedImage.PageCount; page++)
            {
               animatedImage.Page = page; // Specifies the page to be saved
               codecs.Save(
                  animatedImage,
                  Path.Combine(outputDir, $"{page}.png"),
                  RasterImageFormat.Png,
                  0
               );
            }
         }
         else
         {
            // Use a RasterImageAnimator to extract each frame
            // Refer to: https://www.leadtools.com/help/leadtools/v20/dh/l/rasterimageanimator.html

            // Create a target image for drawing the animation onto
            using (RasterImage targetImage = new RasterImage(
                  RasterMemoryFlags.Conventional,           // Create in RAM
                  animatedImage.AnimationGlobalSize.Width,  // Need to allocated enough
                  animatedImage.AnimationGlobalSize.Height, //   space for all image data
                  animatedImage.BitsPerPixel,               // Ensure the image properties
                  animatedImage.Order,                      //   match exactly
                  animatedImage.ViewPerspective,
                  null,
                  IntPtr.Zero,
                  0
               ))
            {
               // Ensure the palette matches
               animatedImage.CopyPaletteTo(targetImage);

               // Only need to loop once for frame extraction
               animatedImage.AnimationGlobalLoop = 1;

               // Remove any delays from the animation
               int page;
               for (page = 1; page <= animatedImage.PageCount; page++)
               {
                  animatedImage.Page = page;
                  animatedImage.AnimationDelay = 0;             // 0ms delay between frames
                  animatedImage.AnimationWaitUserInput = false; // No user input required
               }

               // Perform the frame extraction
               page = 1;
               RasterImageAnimatorState state;
               using (var animator = new RasterImageAnimator(targetImage, animatedImage))
                  do
                  {
                     // Animate
                     state = animator.Process();

                     // Save out the current frame once rendered
                     if (state == RasterImageAnimatorState.PostRender)
                        codecs.Save(
                           targetImage,
                           Path.Combine(outputDir, $"{page++}.png"),
                           RasterImageFormat.Png,
                           0
                        );
                  }
                  while (state != RasterImageAnimatorState.End);
            }
         }
      }
   }
}