main.dart

import 'package:flutter/material.dart';

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      body: new Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          new Image.network('http://i.imgur.com/4wvcG03.png'),
          new Opacity(
            opacity: 0.5,
            child: new Image.network(
              'https://flutter.io/images/flutter-mark-square-100.png',
            ),
          ),
        ],
      ),
    );
  }
}

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      home: new MyHomePage(),
    );
  }
}