Not complete example

[GrzesiekZbozien]

I've just found out that when using flutter_zxing and returning QR as image you MUST use numChannels: 4,

So whole example should be as code (line:280) writer_widget.dart:

final imglib.Image img = imglib.Image.fromBytes( width: width, height: height, bytes: result.data!.buffer, numChannels: 4, );

Also in my opinion example should also contains
final Uint8List encodedBytes = Uint8List.fromList( imglib.encodeJpg(img), ); return Image.memory(encodedBytes);
That's because it will be understandable for flutter developers.