Wsrtjtyk

I'm trying to crop gif images in c# without using an add-ons with drawing a rectangle on the image (and I've got it to work with normal image), but .. lets just say the output is less than optimal..
examples:

Origianl Image:

Cropped Image:

and here's the code that I'm using :

public override Image Crop(Rectangle f, bool isStrch, int slashwid, int slashhei)

    {

        _revert = Image;

        GifDecoder();

        widmult = Width / (double)slashwid;

        heimult = Height / (double)slashhei;

        double num = (double)f.X * widmult;

        double num2 = (double)f.Y * heimult;

        double num3 = (double)f.Width * widmult;

        double num4 = (double)f.Height * heimult;

        Rectangle srcRect = new Rectangle(isStrch ? ((int)num) : f.X, isStrch ? ((int)num2) : f.Y, isStrch ? ((int)num3) : f.Width, isStrch ? ((int)num4) : f.Height);

        CroppedFrames = new Image[Frames.Length];            

        for (int i = 0; i < Frames.Length; i++)

        {



            Bitmap image = new Bitmap(Frames[i]);

            Bitmap bitmap = new Bitmap(srcRect.Width, srcRect.Height);

            using (Graphics graphics = Graphics.FromImage(bitmap))

            {

                graphics.DrawImage(image, new Rectangle(0, 0, bitmap.Width, bitmap.Height), srcRect, GraphicsUnit.Pixel);

            }

            CroppedFrames[i] = bitmap;

        }

        GifEncoder(f.Width,f.Height);

        return Image;

    }





private void GifDecoder()

    {

        Stream bitmapStream = new FileStream(Path, FileMode.Open, FileAccess.Read, FileShare.Read);

        GifBitmapDecoder gifBitmapDecoder = new GifBitmapDecoder(bitmapStream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);

        Frames = new Image[gifBitmapDecoder.Frames.Count];

        for (int i = 0; i < gifBitmapDecoder.Frames.Count; i++)

        {

            Frames[i] = BitmapFromSource(gifBitmapDecoder.Frames[i]);

        }

    }



private void GifEncoder(int width,int height)

    {

        BitmapPalette palette = new BitmapPalette(BitmapImageFromImage(Image),256);



        int bytecount = (width * height) / 8;

        using (FileStream fs = new FileStream(Path + "output.gif", FileMode.Create))

        {

            GifBitmapEncoder encoder = new GifBitmapEncoder();



            for (int f = 0; f < Frames.Length; f++)

            {

                byte pixels = imageToByteArray(CroppedFrames[f]);



                BitmapSource image = BitmapSource.Create(width,height,96,96,System.Windows.Media.PixelFormats.Indexed8,palette,pixels,width);



                encoder.Frames.Add(BitmapFrame.Create(image));



            }

            encoder.Save(fs);

            Image = Image.FromStream(fs);

            fs.Close();



        }

    }





private byte imageToByteArray(Image imageIn)

    {

        MemoryStream ms = new MemoryStream();

        Bitmap aaa = new Bitmap(imageIn);

        aaa.Save(ms, ImageFormat.Png);

        return ms.ToArray();

    }

(bool isStrch, int slashwid, int slashhei) are for checking if the picturebox is smaller than the image or not to get accurate crops with the rect.