If you need to convert a Bitmap to a Byte array, here is how you do it.
Public Shared Function ConvertToByteArray(ByVal value As Bitmap) As Byte()
Dim bitmapBytes As Byte()
Using stream As New System.IO.MemoryStream
value.Save(stream, value.RawFormat)
bitmapBytes = stream.ToArray
End Using
Return bitmapBytes
End Function
This code can be found in the open source dotNetTips.Utility assembly.
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En teoria parece que puede funcionar, voy a probarlo!