Using C# how can I resize a jpeg image?

Question

Using C# how can I resize a jpeg image? A code sample would be great.

Answer 1

Good free resize filter and example code.

http://code.google.com/p/zrlabs-yael/

    private void MakeResizedImage(string fromFile, string toFile, int maxWidth, int maxHeight)
    {
        int width;
        int height;

        using (System.Drawing.Image image = System.Drawing.Image.FromFile(fromFile))
        {
            DetermineResizeRatio(maxWidth, maxHeight, image.Width, image.Height, out width, out height);

            using (System.Drawing.Image thumbnailImage = image.GetThumbnailImage(width, height, new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback), IntPtr.Zero))
            {
                if (image.Width < thumbnailImage.Width && image.Height < thumbnailImage.Height)
                    File.Copy(fromFile, toFile);
                else
                {
                    ImageCodecInfo ec = GetCodecInfo();
                    EncoderParameters parms = new EncoderParameters(1);
                    parms.Param[0] = new EncoderParameter(Encoder.Compression, 40);

                    ZRLabs.Yael.BasicFilters.ResizeFilter rf = new ZRLabs.Yael.BasicFilters.ResizeFilter();
                    //rf.KeepAspectRatio = true;
                    rf.Height = height;
                    rf.Width = width;

                    System.Drawing.Image img = rf.ExecuteFilter(System.Drawing.Image.FromFile(fromFile));
                    img.Save(toFile, ec, parms);
                }
            }
        }
    }