How to resize gif which is stored in bitmap?

Question

i tried to resize Gif image but after resizing it will not animate. i tried the following code resize. LastBitImg = new Bitmap(Width,Height); LastBitImg = FBitImg;

Hussam Barouqa · Answer

An animated GIF contains multiple image frames for the animation. To resize it correctly, you will need to resize each of these frames and store them correctly to maintain the animation. One way to do this is through the LEADTOOLS imaging toolkit(https://www.leadtools.com/downloads?category=main), which has classes for animating GIF images. The code will look like this: Stream imageStream = File.OpenRead( "InputGIFImage.gif" ); int targetWidth = 955; var codec = new RasterCodecs(); codec.Options.Load.AllPages = true ; codec.ThrowExceptionsOnInvalidImages = true ; RasterImage image = codec.Load(imageStream); var scale = 1.0 * targetWidth / image.Width; int resizeHeight = ( int )Math.Round(scale * image.Height); int counter = 0; RasterImage newGif = null ; RasterImage targetImage = new RasterImage(RasterMemoryFlags.Conventional, image.AnimationGlobalSize.Width, image.AnimationGlobalSize.Height, image.BitsPerPixel, image.Order, image.ViewPerspective, null , IntPtr.Zero, 0); RasterImageAnimator animator = new RasterImageAnimator(targetImage, image); RasterImageAnimatorState state; do { state = animator.Process(); switch (state) { case RasterImageAnimatorState.WaitDelay: case RasterImageAnimatorState.WaitInputDelay: case RasterImageAnimatorState.Render: // Continue processing break ; case RasterImageAnimatorState.WaitInput: // In case the animated image has the "wait for user input" flags, // cancel the waiting animator.CancelWait(); break ; case RasterImageAnimatorState.PostClear: case RasterImageAnimatorState.PostRender: RasterImage resizedPage = RasterImage.Create(targetWidth, resizeHeight, 8, image.XResolution, RasterColor.White); ResizeCommand resize = new ResizeCommand(resizedPage, RasterSizeFlags.Resample); targetImage.CopyPaletteTo(resizedPage); resize.Run(targetImage); if (counter == 0) counter = 0; //skip, do nothing else if (counter == 1) newGif = resizedPage.Clone(); else newGif.AddPage(resizedPage); counter++; Console.Write( ".. " + counter.ToString()); break ; default : break ; } } while (state != RasterImageAnimatorState.End); var fileName = Path.Combine( "OutputGIFImage.gif" ); codec.Save(newGif, fileName, RasterImageFormat.Gif, 8); Console.WriteLine( "output file was written " + fileName); Console.ReadKey(); animator.Dispose(); targetImage.Dispose();

Sanwar Ranwa · Answer

https://www.codeproject.com/Questions/1227710/How-to-resize-gif-which-is-stored-in-bitmap

Nanddeep Nachan · Answer

Here are few references on same topic: https://www.codeproject.com/Questions/1227710/How-to-resize-gif-which-is-stored-in-bitmap https://forums.asp.net/t/1439399.aspx?Image+Resizer+in+C+

Prashant Kumar · Answer

You should simply set the PictureBox's SizeMode to StretchImage to make the PictureBox stretch the image for you.