private async Task LoadDecoderAsync()
{
_rawStream.Position = _originalPosition;
Stream rawImageReaderStream = _imageFormat.CreateReader().CreateInputStream(_rawStream, true);
_imageDecoder = _imageDecoderFactory.BuildDecoder(rawImageReaderStream, _decodingConfiguration);
_imageReaderStream = await _imageDecoder.GetDataReaderStreamAsync(rawImageReaderStream);
}