How to convert ImageSource to Byte array?

I use LeadTools for scanning.

I want to convert scanning 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?

Solution 1:

Unless you explicitly need an ImageSource object, there's no need to convert to one. You can get a byte array containing the 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);

Note that this gives you only the raw pixel data.

If you need a memory stream or byte array that contains a complete image such as JPEG, you also do not need to convert to source. You can use the Leadtools.RasterCodecs class like this:

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

Solution 2:

I ran into this issue in Xamarin.Forms where I needed to convert a taken photo from the camera into a Byte array. After spending days trying to find out how, I saw this solution in the Xamarin forums.

var photo = await CrossMedia.Current.TakePhotoAsync(new Plugin.Media.Abstractions.StoreCameraMediaOptions() { });

byte[] imageArray = null;

using (MemoryStream memory = new MemoryStream()) {

    Stream stream = photo.GetStream();
    stream.CopyTo(memory);
    imageArray = memory.ToArray();
}

Source: https://forums.xamarin.com/discussion/156236/how-to-get-the-bytes-from-the-imagesource-in-xamarin-forms

Solution 3:

If you are using Xamarin, you can use this:

public byte[] ImageSourceToBytes(ImageSource imageSource)
{
    StreamImageSource streamImageSource = (StreamImageSource)imageSource;
    System.Threading.CancellationToken cancellationToken = 
    System.Threading.CancellationToken.None;
    Task<Stream> task = streamImageSource.Stream(cancellationToken);
    Stream stream = task.Result;
    byte[] bytesAvailable = new byte[stream.Length];
    stream.Read(bytesAvailable, 0, bytesAvailable.Length);
    return bytesAvailable;
}