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How to convert ImageSource to byte array?

I use LeadTools for scanning.

I want to convert the scan image to byte.

void twainSession_AcquirePage(object sender, TwainAcquirePageEventArgs e)
 {
   ScanImage = e.Image.Clone();
   ImageSource source = RasterImageConverter.ConvertToSource(ScanImage, ConvertToSourceOptions.None);
 }

How to convert ImageSource to byte array?

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4 answers

Unless you explicitly need an ImageSource object, there is no need to convert it to one. You can get an array of bytes containing pixel data directly from Leadtools.RasterImage using this code:

int totalPixelBytes = e.Image.BytesPerLine * e.Image.Height;
byte[] byteArray = new byte[totalPixelBytes];
e.Image.GetRow(0, byteArray, 0, totalPixelBytes);

Please note that this only gives you the raw pixel data.

If you need a memory stream or an array of bytes that contains a complete image, such as JPEG, you also do not need to convert it to source code. You can use the Leadtools.RasterCodecs class as follows:

RasterCodecs codecs = new RasterCodecs();
System.IO.MemoryStream memStream = new System.IO.MemoryStream();
codecs.Save(e.Image, memStream, RasterImageFormat.Jpeg, 24);
0
source

, .ConvertToSource BitmapSource ImageSource.

100%, , LeadTools VB:

   Dim source As BitmapSource
   Using raster As RasterImage = RasterImageConverter.ConvertFromSource(bitmap, ConvertFromSourceOptions.None)
      Console.WriteLine("Converted to RasterImage, bits/pixel is {0} and order is {1}", raster.BitsPerPixel, raster.Order)

      ' Perform image processing on the raster image using LEADTOOLS
      Dim cmd As New FlipCommand(False)
      cmd.Run(raster)

      ' Convert the image back to WPF using default options
      source = DirectCast(RasterImageConverter.ConvertToSource(raster, ConvertToSourceOptions.None), BitmapSource)
   End Using

,

BitmapSource source = RasterImageConverter.ConvertToSource(ScanImage, ConvertToSourceOptions.None) as BitmapSource;

BitmapSource BitmapSource.CopyPixels

0

MemoryStream:

var source = RasterImageConverter.ConvertToSource(ScanImage, ConvertToSourceOptions.None) as BitmapSource;
byte[] data;
JpegBitmapEncoder encoder = new JpegBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(source));
using (MemoryStream ms = new MemoryStream())
{
   encoder.Save(ms);
   data = ms.ToArray();
}
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Image WPF

public static class ImageHelper
    {
        /// <summary>
        /// ImageSource to bytes
        /// </summary>
        /// <param name="encoder"></param>
        /// <param name="imageSource"></param>
        /// <returns></returns>
        public static byte[] ImageSourceToBytes(BitmapEncoder encoder, ImageSource imageSource)
        {
            byte[] bytes = null;
            var bitmapSource = imageSource as BitmapSource;

            if (bitmapSource != null)
            {
                encoder.Frames.Add(BitmapFrame.Create(bitmapSource));

                using (var stream = new MemoryStream())
                {
                    encoder.Save(stream);
                    bytes = stream.ToArray();
                }
            }

            return bytes;
        }

        [DllImport("gdi32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool DeleteObject(IntPtr value);

        public static BitmapSource GetImageStream(Image myImage)
        {
            var bitmap = new Bitmap(myImage);
            IntPtr bmpPt = bitmap.GetHbitmap();
            BitmapSource bitmapSource =
             System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
                   bmpPt,
                   IntPtr.Zero,
                   Int32Rect.Empty,
                   BitmapSizeOptions.FromEmptyOptions());

            //freeze bitmapSource and clear memory to avoid memory leaks
            bitmapSource.Freeze();
            DeleteObject(bmpPt);

            return bitmapSource;
        }

        /// <summary>
        /// Convert String to ImageFormat
        /// </summary>
        /// <param name="format"></param>
        /// <returns></returns>
        public static System.Drawing.Imaging.ImageFormat ImageFormatFromString(string format)
        {
            if (format.Equals("Jpg"))
                format = "Jpeg";
            Type type = typeof(System.Drawing.Imaging.ImageFormat);
            BindingFlags flags = BindingFlags.GetProperty;
            object o = type.InvokeMember(format, flags, null, type, null);
            return (System.Drawing.Imaging.ImageFormat)o;
        }

        /// <summary>
        /// Read image from path
        /// </summary>
        /// <param name="imageFile"></param>
        /// <param name="imageFormat"></param>
        /// <returns></returns>
        public static byte[] BytesFromImage(String imageFile, System.Drawing.Imaging.ImageFormat imageFormat)
        {
            MemoryStream ms = new MemoryStream();
            Image img = Image.FromFile(imageFile);
            img.Save(ms, imageFormat);
            return ms.ToArray();
        }

        /// <summary>
        /// Convert image to byte array
        /// </summary>
        /// <param name="imageIn"></param>
        /// <param name="imageFormat"></param>
        /// <returns></returns>
        public static byte[] ImageToByteArray(System.Drawing.Image imageIn, System.Drawing.Imaging.ImageFormat imageFormat)
        {
            MemoryStream ms = new MemoryStream();
            imageIn.Save(ms, imageFormat);
            return ms.ToArray();
        }

        /// <summary>
        /// Byte array to photo
        /// </summary>
        /// <param name="byteArrayIn"></param>
        /// <returns></returns>
        public static Image ByteArrayToImage(byte[] byteArrayIn)
        {
            MemoryStream ms = new MemoryStream(byteArrayIn);
            Image returnImage = Image.FromStream(ms);
            return returnImage;
        }
    }

, .

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